Goal
Improve performance
How
Store the result of slow calculations so that they do not need to be
executed again
Documentation: api.drupal.org caching topic
$key = 'my-unique-cache-key';
if ($cache = \Drupal::cache()->get($key)) {
$data = $cache->data;
}
else {
$data = my_slow_calculation();
\Drupal::cache()->set($key, $data);
}
// Alternative for multiple items
\Drupal::cache()->getMultiple($keys);
\Drupal::cache()->setMultiple($items);
Static caching refers to the concept doing in-memory, per-request caching
In Drupal 7 and non-OOP code in Drupal 8, the function drupal_static() is often used
In Drupal 8, using a non-static property on a service works in the same way
Cache backends usually do not use static cache, requesting the same item twice results in two queries
protected $data;
protected function getData() {
if ($this->data === NULL) {
$key = 'my-unique-cache-key';
if ($cache = $this->cacheBackend->get($key)) {
$this->data = $cache->data;
}
else {
$this->data = $this->buildData();
$this->cacheBackend->set($key, $this->data);
}
}
return $this->data;
}
Storage for cache items
Problem: APCu is fast but not shared across multiple servers/with drush
Limited use cases, no non-test uses right now in core
Can be used as an alternative to the static cache pattern shown before
$chain = new BackendChain('noop');
$chain
->appendBackend(\Drupal::cache('static'))
->appendBackend(\Drupal::cache('default'));
$chain->get('my-unique-cache-key');
$chain->get('my-unique-cache-key');
A container for cache entries with a configurable backend
\Drupal::cache($bin)->get()
$container->get("cache.$bin")
yourmodule.services.yml:
cache.your_bin:
class: Drupal\Core\Cache\CacheBackendInterface
tags:
- { name: cache.bin }
factory: cache_factory:get
arguments: [your_bin]
// Use redis by default.
$settings['cache']['default'] = 'cache.backend.redis';
// Use the null backend to disable caching for certain bins.
$settings['cache']['bins']['render'] = 'cache.backend.null';
How to configure Redis: See README.md
Never develop without using sites/example.settings.local.php
There are only two hard things in Computer Science: cache invalidation, naming things and off-by-one errors.http://martinfowler.com/bliki/TwoHardThings.html
In case there is a single or only a few cache item with known keys, delete them directly
\Drupal::cache()->delete('my-key');
\Drupal::cache()->deleteMultiple(['my-key:de', 'my-key:en']);
\Drupal::cache()->deleteAll();
Faster than cache tags, no runtime overhead. If possible, just write new caches instead of using delete()
Same methods as delete, except invalidate*(). Does not actually delete just marks records as invalidated.
\Drupal::cache()->invalidate('my-key');
\Drupal::cache()->invalidateMultiple(['my-key:de', 'my-key:en']);
\Drupal::cache()->invalidateAll();
Extremely rarely used. Core has a single invalidate call and that is likely wrong*.
* Might be my fault.
Set a fixed expiration time for a cache item on write.
Examples
// Cache for 10 minutes, not known if/when it changes.
$cache->set($key, $data, REQUEST_TIME + 600);
// $data is only valid today.
$cache->set($key, $data, strtotime('tomorrow midnight'));
Note: Expiration is a timestamp, not an age
Dependencies of your cache: entities, configuration, custom
// Data must be invalidated if node 1 or the node settings change.
$cache->set($key, $data, ..., ['node:1', 'config:node.settings']);
// Tag invalidation is across all bins.
$cache_tag_invalidator->invalidateTags(['my_tag']);
Cache::invalidateTags(['my_tag']);
Entity and Config cache tags are invalidated automatically. Use custom cache tags for unknown amount of cache item variations.
Runtime overhead on every cache read. Limit cache tags to the required minimum.
Invalid data can still be used.
$cache = \Drupal::cache()->get('my-key', TRUE);
if ($cache && $cache->valid) {
return $cache->data;
}
elseif (\Drupal::lock()->acquire('my-key')) {
// Rebuild and set new data.
}
elseif ($cache) {
// Someone else is rebulding, work with stale data.
return $cache->data;
}
else {
// Wait or rebuild.
}
Other uses: Rebuild in background (queue), min-age
$build = $view_builder->view($node, 'full');
www.drupal.org/docs/drupal-apis/render-api/cacheability-of-render-arrays
Is my data worth caching? If yes, what identifies my data?
Does my output vary by something?
Examples:
theme, language, user roles, permissions, URL, query
arguments, timezone, ...
Default cache contexts:
theme, languages:language_interface, user.permissions
What things does my output depend on?
What changes require that my data is regenerated?
When does my output become outdated?
{cache_render}
cid: entity_view:node:4:full:[languages:language_interface]=en
:[theme]=bartik:[timezone]=Europe/Berlin:
[url.query_args:key]=:[user.permissions]=da0b1c64....:
[user.roles]=is-super-user
data: a:3:{s:7:"#markup";O:25:"Drupal\Core\Render\Markup....
expire: -1
tags: config:filter.format.basic_html config:image.style.large
file:1 node:4 node_view rendered taxonomy_term:1 user:1
user_view
checksum: 17
Every node view on your site has the node_list cache tag
Example: "Promoted events" block in sidebar
Every time any node is saved, the block and every page containing that block is invalidated
Allows to use a configurable cache, e.g. event:promoted
Placeholders: news:section:{{ raw_arguments.arg1 }}
Drupal 9+ now has built-in bundle cache tags, like node_list:article
More specific use cases requires code to define/invalidate cache tags in a hook_entity_presave()
For self-contained parts of a page
Examples: Blocks, Comment form, Poll, CSRF tokens, Flag links
A callback with arguments (scalar values only)
Can be put as a placeholder in cached data if uncacheable/many variations
$output['comment_form'] = [
'#lazy_builder' => ['comment.lazy_builders:renderForm', [
$entity->getEntityTypeId(),
$entity->id(),
$field_name,
$this->getFieldSetting('comment_type'),
]],
'#create_placeholder' => TRUE,
];
Cache contexts can bubble up.. but they are part of the key that needs to be known initially
The secret is that two cache entries are stored, one just contains all the cache contexts
Video by @WimLeers
None of those features are exclusive, they work best when combined together. And Drupal 8 does that automatically, based on cacheability metadata, with almost zero configuration.
Hitchhikers Guide to the Galaxy, http://geekifyinc.com/product/hitchhikers-guide-to-the-galaxy-tablet-ereader-cover/
Knowing some of these concepts can help, but...
* Remember to test with caching enabled before deploying.


Terms of Service
February 17, 2014
Thank you for your interest in Dragdis!
Dragdis's products and services are provided and owned by UAB Dragdis and Dragdis, LLC ("we," "us," "our," or "Dragdis").
These terms of service (the “Terms”) govern your access to and use of Dragdis products and services, which include the Dragdis website, browser extension, Dragdis software, Dragdis mobile application and any services that Dragdis provides through our application, software or website (all of which collectively are referred as the "Dragdis Services"). Dragdis retains all right, title and interest in and to the Dragdis Services and any portion thereof, including, without limitation, all patent rights, copyrights, trademarks, service marks, trade secrets and other intellectual property rights, any derivative work of the Dragdis Services, and any update, and any copies thereof.
We kindly ask you to carefully read these Terms before you access,install and use the Dragdis Services. Please note that the Terms constitute a binding legal agreement between you and Dragdis. By installing, accessing and/or using the Dragdis Services on any platform or device you agree to be bound by these Terms and by our Privacy Policy. If you are using the Dragdis Services on behalf of an organization, you are agreeing to these Terms for that organization and acknowledging that you have the authority to act on behalf of that organization, and commit to these Terms on behalf of that organization.
If you have questions or concerns regarding these Terms, our Privacy Policyor Dragdis Services pleasecontact us at:
Dragdis, LLC
Naugarduko g. 3, Vilnius
+1<PHONE_NUMBER>
<EMAIL_ADDRESS>1. Using Dragdis Services
a. Who and howcan use Dragdis Services
Dragdis Services provided solely for your personal, noncommercial use. You may use Dragdis Services only if you can legally accept these Terms and commit under these Terms, and only in compliance with these Terms and all applicable laws.
When you create your Dragdis Services account, you must provide us with accurate and complete information. Any use or access by anyone under the age of 13 is prohibited.
Some of Dragdis Services may be software that is downloaded to your computer, phone, tablet, or other device. You agree that we may automatically update these Dragdis Services, and these Terms will apply to such updates. "Update" shall mean any modification, error correction, bug fix, new release, upgrade, patch or other update to or for the Dragdis Services.
b. Our license to you
Subject to these Terms and our policies (including our Privacy Policy), we grant you a limited, non-exclusive, non-transferable, and revocable license to use Dragdis Services. If you want to make commercial use of any of the Dragdis Services, you must enter into a separate written agreement with us in advance. The license provided herein is effective until terminated. This license automatically terminates if you fail to comply with the terms and conditions of this Agreement.
c. Restrictions on using Dragdis Services
We may unilaterally and without any notice or warning set forth and enforce restrictions on using Dragdis Services, especially when it is required for observing the acceptable use of the Dragdis Services (please also see Section 11 of these Terms). We reserve the right to unilaterally refuse service, terminate your accounts or limit access to the Dragdis Services at our sole discretion.
2. Your Content
a. Creating Dragdis account
You are not required to create a user account or provide any personal information in order to visit Dragdis website, however, you are required to create a user account in order to use Dragdis Services. When you create a user account, you must provide requested current, complete, and accurate information about you. You must maintain and update such information current, complete and accurate. You warrant that information that you provide to us will be truthful, accurate, and complete, and that you are authorized to provide such information. You authorize us to verify your such information at our own discretion and at any time.
b. Saving and retaining content
Dragdis allows you to save, retain and sharecontent, including photos, videos, text, links and other materials with the Dragdis Services. Anything that you save, post or otherwise retain on Dragdis Services is referred to as "User Content." Dragdis respects the intellectual property of others, and we ask our users to do the same. When you save and retain any content with the Dragdis Services please consult the websites and online resourcesfrom which such content originates for copyright notices, information and restrictions that may be applicable to such content. Please note that certain content may not be reproduced, used to prepare derivative works, distributed, performed publicly or displayed publicly without the written permission of the right holders. You are solely responsible for the User Content you save and retainwith the Dragdis Services and you will not violate the restrictions posted on the website or resource where such content originates. As a condition to your use of the Dragdis Services, you agree not to use the Dragdis Services to infringe any intellectual property rights. You may be subject to civil and criminal penalties, including without limitation monetary damages, if you violate these Terms or infringe any third party’s legal rights. We reserve the right, at any time, in our sole discretion, with or without notice, to terminate the accounts of, and block access to the Dragdis Services to any users who infringe any copyrights or other intellectual property rights.
c. Privacy of the User Content
Please thoroughly read our Privacy Policy, which in addition to these Terms thoroughly explains how Dragdis uses User Content, what type of information Dragdis collects and what might happen to that information. Our Privacy Policy is not a legal agreement, and creates no contractual obligations, nevertheless it contains information that is essential and will apply with respect of the Dragdis Services and the User Content, whether or not you choose to read it.
You grant Dragdis a non-exclusive, royalty-free, transferable, sub-licensable, worldwide license to use, store, display, reproduce, modify, create derivative works, perform, and distribute your User Content on Dragdis for the purposes of operating, developing, improving, providing, and using the Dragdis Services. Nothing in these Terms shall restrict other legal rights Dragdis may have to User Content, for example under other licenses and the Privacy Policy.
We reserve the unilateral right to remove or modify User Content for any reason, including User Content that we believe violates these Terms or our policies, without any notice or warning.
d. How long we keep your User Content
Following termination or deactivation of your account, or if you remove any User Content from Dragdis, we may retain your User Content for a commercially reasonable period of time for backup, archival, or audit purposes. Furthermore, Dragdis may retain and continue to use, store, display, reproduce, modify, create derivative works, perform, and distribute any of your User Content that other users have stored or shared through Dragdis Services.
e. Feedback you provide
We value hearing from our users, and are always interested in learning about ways we can make Dragdis more awesome. If you choose to submit comments, ideas or feedback, you agree that we are free to use them without any restriction or compensation to you. By accepting your submission, Dragdis does not waive any rights to use similar or related Feedback previously known to Dragdis, or developed by its employees, or obtained from sources other than you.
3. Security
We care about your security. You are solely responsible for maintaining the confidentiality of your account and password and for restricting access to your account. While we work to protect the security of your content and account, Dragdis cannot guarantee that unauthorized third parties will not be able to defeat our security measures. You agree to accept responsibility for all activities that occur under your account or password, whether or not authorized by you. Please notify us immediately of any compromise or unauthorized use or suspected unauthorized use of your account, or loss of access to your account or password, as the case may be.
4. Third-Party Links, Sites, and Services
Dragdis Services may contain links to third-party websites, advertisers, services, special offers, or other events or activities that are not owned or controlled by Dragdis. We do not endorse or assume any responsibility for any such third-party sites, information, materials, products, or services. If you access any third party website, service, or content from Dragdis, you do so at your own risk and you agree that Dragdis will have no liability arising from your use of or access to any third-party website, service, or content.
Dragdis Services may integrate with third-party software applications and services that enable you to save User Content within such third-party applications. In these cases we may use information about the User Content pertaining to such third party applications and services to improve the service offerings by such third parties.
5. Termination
Dragdis may terminate or suspend this license at any time, with or without cause or notice to you.
6. Indemnity
If your use of Dragdis Services results in legal action against you for any reason, including without limitation for reasons of copyright violation, you agree to indemnify and hold harmless Dragdis and its officers, directors, employees and agents, from and against any claims, suits, proceedings, disputes, demands, liabilities, damages, losses, costs and expenses, including, without limitation, reasonable legal and accounting fees (including costs of defense of claims, suits or proceedings brought by third parties), in any way related to (a) your access to or use of Dragdis Services, (b) your User Content, or (c) your breach of any of these Terms.
7. Disclaimers
Reasonable efforts are taken to improve the accuracy and integrity of the Dragdis Services, but we are not responsible for mistakes, out-of-date information, inaccuracies, typographical or other errors. Notwithstanding any other provision of these Terms, we reserve the right to change, suspend, remove, or disable access to any of the Dragdis Services, content, or other materials comprising a part of the Dragdis Services at any time without notice. In no event will we be liable for making these changes.
As a registered user in good standing, you may be provided with limited access to the User Content. Such access is provided as an accommodation only, and the items you save and retain with the Dragdis Services may be lost or deleted. We do not warrant, and will not have any liability or responsibility for, your use of the Dragdis Services. We may also impose limits on the use of or access to certain features or portions of the Dragdis Services, for any reason and without notice or liability. Dragdis Services, including our website, products and services may be unavailable from time to time due to mechanical, telecommunication, software, and other failures. We cannot predict or control when such downtime may occur and cannot control the duration of such downtime. Dragdis takes no responsibility and assumes no liability for any User Content that you or any other user or third party saves, retains, posts or transmits using Dragdis Services. You understand and agree that you may be exposed to User Content that is inaccurate, objectionable, inappropriate for children, or otherwise unsuited to your purpose.
The Dragdis Services are provided on an "as is" basis without warranty of any kind, whether express or implied.
 WITHOUT LIMITING THE FOREGOING, WE NEITHER WARRANT NOR REPRESENT THAT THE DRAGDIS SERVICES WILL BE AVAILABLE FOR YOUR ACCESS OR USE, NOR THAT OPERATION OF THE DRAGDIS SERVICES WILL BE ERROR FREE OR UNINTERRUPTED.
8.  TO THE MAXIMUM EXTENT PERMITTED BY LAW, DRAGDIS SHALL NOT BE LIABLE FOR ANY INDIRECT, INCIDENTAL, SPECIAL, CONSEQUENTIAL OR PUNITIVE DAMAGES, OR ANY LOSS OF PROFITS OR REVENUES, WHETHER INCURRED DIRECTLY OR INDIRECTLY, OR ANY LOSS OF DATA, USE, GOOD-WILL, OR OTHER INTANGIBLE LOSSES, RESULTING FROM (A) YOUR ACCESS TO OR USE OF OR INABILITY TO ACCESS OR USE THE DRAGDIS SERVICES; (B) ANY CONDUCT OR CONTENT OF ANY THIRD PARTY ON THE DRAGDIS SERVICES, INCLUDING WITHOUT LIMITATION, ANY DEFAMATORY, OFFENSIVE OR ILLEGAL CONDUCT OF OTHER USERS OR THIRD PARTIES; OR (C) UNAUTHORIZED ACCESS, USE OR ALTERATION OF YOUR TRANSMISSIONS OR CONTENT. IN NO EVENT SHALL DRAGDIS'S AGGREGATE LIABILITY EXCEED ONE HUNDRED U.S. DOLLARS (U.S. $100).
9. Arbitration
For any dispute you have with Dragdis, you agree to first contact us and attempt to resolve the dispute with us informally. If Dragdis has not been able to resolve the dispute with you informally, we each agree to resolve any claim, dispute, or controversy (excluding claims for injunctive or other equitable relief) arising out of or in connection with or relating to these Terms by binding arbitration by the American Arbitration Association ("AAA") under the Commercial Arbitration Rules and Supplementary Procedures for Consumer Related Disputes then in effect for the AAA, except as provided herein. Unless you and Dragdis agree otherwise, the arbitration will be conducted in the county where you reside. Each party will be responsible for paying any AAA filing, administrative and arbitrator fees in accordance with AAA rules, except that Dragdis will pay for your reasonable filing, administrative, and arbitrator fees if your claim for damages does not exceed $75,000 and is non-frivolous (as measured by the standards set forth in Federal Rule of Civil Procedure 11(b)). The award rendered by the arbitrator shall include costs of arbitration, reasonable attorneys' fees and reasonable costs for expert and other witnesses, and any judgment on the award rendered by the arbitrator may be entered in any court of competent jurisdiction. Nothing in this Section shall prevent either party from seeking injunctive or other equitable relief from the courts for matters related to data security, intellectual property or unauthorized access to the Service. ALL CLAIMS MUST BE BROUGHT IN THE PARTIES' INDIVIDUAL CAPACITY, AND NOT AS A PLAINTIFF OR CLASS MEMBER IN ANY PURPORTED CLASS OR REPRESENTATIVE PROCEEDING, AND, UNLESS WE AGREE OTHERWISE, THE ARBITRATOR MAY NOT CONSOLIDATE MORE THAN ONE PERSON'S CLAIMS.
10. Governing Law and Jurisdiction
These Terms shall be governed by the laws of the State of Delaware, without respect to its conflict of laws principles. We each agree to submit to the personal jurisdiction of a state court located in New York, NY or the United States District Court for the Southern District of New York, for any actions not subject to Section 9 (Arbitration).
We make no representations that Dragdis Servicesare appropriate, legal or available for use in locations and jurisdictions outside of the United States. By using them outside of the United States you do so at your own choice and expressly assume all relevant risks.
11. Acceptable Use
You agree not to engage in any of the following prohibited activities:
- · Use, display, mirror or frame the Dragdis Services, any individual element within the Dragdis Services, the Dragdis name, trademark, logo or other proprietary information, or the layout and design of any page or feature, without our express written consent;
- · Modify, translate, reverse engineer, decompile, disassemble, or create any derivative works based on the Dragdis Services, including any of its files, tables or documentation, or any portion thereof, or determine or attempt to determine any source code, algorithms, methods or techniques embodied in the Dragdis Services or any portion thereof;
- · Access, tamper with, or use non-public areas of the Dragdis Services, our computer systems, or the technical delivery systems of our providers;
- · Attempt to probe, scan, or test the vulnerability of any Dragdis system or network or breach any security or authentication measures;
- · Avoid, bypass, remove, deactivate, impair, descramble or otherwise circumvent any technological measure implemented by Dragdis or any of our providers or any other third party (including another user) to protect the Dragdis Services or User Content;
- · Attempt to access or search the Dragdis Services, User Content or scrape or download User Content from the Dragdis Services, or otherwise use, upload content to, or create new links, reposts, or referrals in the Dragdis Services through the use of any engine, software, tool, agent, device or mechanism (including automated scripts, spiders, robots, crawlers, data mining tools or the like) other than the software and/or search agents provided by Dragdis or other generally available third party web browsers;
- · Send any unsolicited or unauthorized spam and spam comments on posts, advertising messages, promotional materials, email, junk mail, chain letters or other form of solicitation;
- · Use any meta tags or other hidden text or metadata utilizing a Dragdis name or Dragdis trademark, logo, URL, or product name without Dragdis's express written consent;
- · Use the Dragdis Services for any commercial purpose or the benefit of any third party, except as otherwise explicitly permitted for you by Dragdis or in any manner not permitted by the Terms;
- · Market, rent or lease the Dragdis Services for a fee or charge, or use the Dragdis Services to advertise or perform any commercial solicitation;
- · Distribute, license, transfer, or sell, in whole or in part, any of the Dragdis Services or any derivative works thereof;
- · Use Dragdis user information to forge any TCP/IP packet header or any part of the header information in any email or newsgroup posting, or in any way use the Dragdis Services to send altered, deceptive or false source-identifying information;
- · Attempt to decipher, decompile, disassemble or reverse engineer any of the software used to provide the Dragdis Services;
- · Interfere with, or attempt to interfere with, the access of any user, host or network, including, without limitation, sending a virus, overloading, flooding, spamming, or mail-bombing the Dragdis Services;
- · Collect or store any personally identifiable information from the Dragdis Services from other users of the Services without their express permission;
- · Use the Dragdis Services to upload or distribute in any way files that contain viruses, corrupted files, or any other similar software or programs that may damage the operation of another's computer;
- · Interfere with or attempt to interfere with the proper working of the Dragdis Services, any transactions being offered in connection with the Dragdis Services or any other activities conducted by us, disrupt our website or any networks connected to the Dragdis Services, or bypass any measures we may use to prevent or restrict access to the Dragdis Services;
- · Exploit the Dragdis Services in any unauthorized way whatsoever, including, but not limited to burdening network capacity or circumvention of any applicable controls;
- · Take any action that imposes or may impose an unreasonable or disproportionately large load on our or third party infrastructure;
- · Share any content with any unreasonably large number of recipients, including sharing content with persons you do not know or who do not know you;
- · Incorporate the Dragdis Services or any portion thereof into any other program, service or product.
- · Impersonate or misrepresent your affiliation with any person or entity;
- · Violate any applicable law or regulation; or
- · Encourage or enable any other individual or third party to do any of the above activities.
· Use the Dragdis Services for any illegal purposes;
Dragdis reserves the right, but is not obligated, to remove any User Content for any reason or for no reason, including User Content that Dragdis believes violates these Terms. Dragdis may also permanently or temporarily terminate or suspend a user account without notice and liability for any reason, including if, in Dragdis's sole determination, a user violates any provision of these Terms or for no reason.
12. General Terms
Notifications. Dragdis reserves the right to determine the form and means of providing notifications to you, and you agree to receive legal notices electronically.
Assignment. These Terms, and any rights and licenses granted hereunder, may not be transferred or assigned by you, but may be assigned by Dragdis without restriction. Any attempted transfer or assignment in violation hereof shall be null and void.
Entire Agreement/Severability. These Terms and any amendments and any additional agreements you may enter into with Dragdis in connection with the Dragdis Services, shall constitute the entire agreement between you and Dragdis concerning the Dragdis Services. If any provision of these Terms is deemed invalid, then that provision will be limited or eliminated to the minimum extent necessary, and the remaining provisions of these Terms will remain in full force and effect.
No Waiver. No waiver of any term of these Terms shall be deemed a further or continuing waiver of such term or any other term, and Dragdis's failure to assert any right or provision under these Terms shall not constitute a waiver of such right or provision.
Confidentiality. The Dragdis Services may enable users to share, save or post information or materials, or to communicate with or otherwise share information with other users or parties. You agree not to share, save, retain, display, disseminate, or otherwise communicate any defamatory, inaccurate, abusive, threatening, offensive, indecent, illegal or otherwise objectionable material, or any material that violates any federal, state, or local law in the United States or anywhere else in the world. You are solely responsible for all information which you share, save, submit, publish, display, retain, disseminate or otherwise communicate through the Dragdis Services, even if a claim should arise after termination of service. You agree that all such content, messages and other communications shall not be deemed to be confidential, private or secure, and that any such content, messages and communications can be read by the operators and/or other agents of Dragdis, whether or not they are the intended recipients. If we or any other person asks you to cease and desist from sharing any content with any third party, or to cease communicating with any third party via the Dragdis Services, you agree to comply with such request immediately.
International Access. The Dragdis Services can be accessed from countries other than the United States.We make no representations or warranties that the Dragdis Services are appropriate for use or access in locations and jurisdictions outside the Unites States. If you access and use the Dragdis Services outside the United States, you do so on your own initiative and you are responsible for complying with United States and your local laws and regulations, if and to the extent such laws are applicable.
Access by Children. In the United States, if you are a device manufacturer or other third party (the "Sponsor") that provides devices to children under the age of 13 that utilize the Dragdis Services, you assume the responsibility for complying with the U.S. Children's Online Privacy Protection Act ("COPPA") and, to the extent applicable, The Family Educational Rights and Privacy Act ("FERPA"). This means that the Sponsor must notify parents/guardians of the information to be collected and obtain parental/guardian consent before collecting and sharing with the Dragdis or through the Dragdis Services the personal information of children under the age of 13 in order to establish an account or use the Dragdis Services. Schools may under appropriate circumstances provide such consent on behalf of parents/guardians. For more information on complying with COPPA, see the Federal Trade Commission’s website at http://www.ftc.gov/privacy/coppafaqs.shtm.
Except as provided in the paragraph above, the Dragdis Services are not for individuals under the age of 13. If you are 13 or older but under the age of 18, you should review this Agreement with your parent or guardian to make sure that you and your parent or guardian understand and agree to it.
Electronic Communications. If you create a user account or send emails to us, you consent to receive communications from us electronically. We will communicate with you by email or by posting notices on the Dragdis Services. You agree that all agreements, notices, disclosures and other communications that we provide to you electronically satisfy any legal requirement that such communications be in writing. You agree that we may send email to you for the purpose of advising you of changes or additions to the Dragdis Services, about any of our other products or services, or for such other purposes as we deem appropriate.
Force Majeure. We shall not be responsible or have any liability for any delay or failure to perform to the extent due to unforeseen circumstances or causes beyond its reasonable control, including, without limitation, acts of God, earthquake, fire, flood, embargoes, labor disputes and strikes, riots, war, novelty of product manufacture or other unanticipated product development problems, and acts of civil and military authorities.
Revisions to the Terms. We may, at any time, and without notice, revise these Terms. If we modify the Terms, we will post the modification on our website, or through the Dragdis Services, or otherwise provide you with notice of the modification. Prior to each usage of the Dragdis Services, you should review these Terms of Service to determine the current terms and agreement to which you are bound. For your convenience, we include the effective date of the Terms and agreement at the beginning of the document, so that you can easily ascertain whether it has been updated since the last time you viewed the Terms of Service. Your continued use of the Dragdis Services constitutes acceptance of these Terms and agreement at the time of each use. If the modified Terms are not acceptable to you, your only recourse is to cease using the Dragdis Services. Notwithstanding the preceding sentences of this paragraph, no revisions to the Terms of Service will apply to any dispute between you and Dragdis that arose prior to the date of such revision.
Proprietary Rights Notices. All trademarks, service marks, logos, trade names and any other proprietary designations of Dragdis used herein are trademarks or registered trademarks of Dragdis. Any other trademarks, service marks, logos, trade names and any other proprietary designations are the trademarks or registered trademarks of their respective parties.


We are going to use Berkeley Gfx with Vulkan for this project. Specifically, we will be using the ShaderGraph of Berkeley Gfx to implement our smoke simulation. Our simulation will be described as a state machine so that we will use the previous output state as the input for the next state to simulate dynamic smokes.
We will calculate our stage transition based on a slightly varied form of Navier–Stokes Equation:
This will be very similar to using Navier–Stokes Equation to simulate fluids. One variation we will make is that we are going to add an additional force, buoyancy, so that the smoke will rise up. We think the example 3 from the BerkeleyGFX library provided by staff is relevant to our final project, so we decided to first render the example 3 and build our project on top of that framework. Example 3 displays the famous Game of Life. Instead of each flickering life, we want to have a stable pixel. So first, we want to render something like a drawing pad brush. It will draw as the mouse moves. The drawn stroke will not move or fade. Then we will add a diffusion effect to the brush stroke. After that, we will add in dissipation effects so that the particles disappear as the time proceeds. Finally, we will add in other different variables that will affect the smoke. Here are three variables we plan to add:
Buoyancy is an upward force that opposes the weight of the object, in this case, the particle of the smoke. Since it is an upward force, the buoyancy value will apply force onto the y axis. Buoyancy reflects the density of the smoke particles. The more dense the smoke is, the less buoyant force there is. Therefore, increasing the buoyant force will cause smoke to rise, meaning that the smoke has a smaller density, and vice versa. Buoyancy is also related to temperature. Higher temperature causes the density to decrease (that’s also why hot air balloons can rise) and therefore results in a higher buoyancy value.
In basic principles, temperature affects the motion of a fluid by causing warmer particles to rise and cooler particles to fall. This is related to our principles and equations for implementing buoyancy. By treating temperature as a scalar quality that is advected along the fluid’s velocity, we can model the change in temperature over time by calculating the current temperature multiplied by the dot product of the velocity and the divergence.
Vorticity is a pseudovector field that describes rotation in a fluid. As a variable in our smoke simulation we will be able to restore some rotational forces dampened due to the simulation. We can model vorticity in the smoke simulation as a constant term that will be consistent throughout the simulation. The constant term can be increased or decreased to add more or less rolling effects of the smoke in the simulation. To calculate the vorticity, we first look at what represents it in the Navier-Stokes equation, F.
To get the vorticity component of F, we compute the the vorticity field by taking the curl of the velocity field to obtain the vorticity ω = ∇ × u, computing normalized vorticity location vectors N = ∇|ω|/|∇|ω||, and then applying a force F = eh(N ×ω) scaled by the size of the grid, h and a strength parameter, e.
Video & Slides


|
xpcc
|
Simple to use classes for implementing menu structures on graphic displays. More...
Classes | |
| class | xpcc::AbstractMenu |
| The AbstractMenu class is the same as the AbstractView class, except it forces the developer to reimplement the handling of button presses. More... | |
| class | xpcc::AbstractView |
| The AbstractView class is the base class for all screens handled by the ViewStack class. More... | |
| class | xpcc::ChoiceMenu |
| The ChoiceMenu class provides a simmliar list like the Standard Menu. More... | |
| class | xpcc::ScrollableText |
| The ScrollableText class scrolls the text if the required space of the string is less than the available. More... | |
| struct | xpcc::MenuEntry |
| Menu Entry of Standard Menu. More... | |
| class | xpcc::StandardMenu |
| StandardMenu provides a vertical list of entry. More... | |
| class | xpcc::ViewStack |
| Stack which handles the displaying of views on the graphic display. More... | |
Enumerations | |
| enum | xpcc::MenuButtons::Button { LEFT, RIGHT, UP, DOWN, OK } |
| The Button enum defines the five buttons, which are used in the views. More... | |
Some convenience classes for implementing menus. The menus are using a stack to allow stepping forward and backwards through the screens. The menus are based on the usage of five buttons. Inside most of the screens these buttons have the following functions: Left: Go back one screen. Right: Go to next screen. Up: Go to previous selected entry on screen Down: Go to next entry on screen OK: Edit selected entry


Women's Volleyball
College volleyball: No. 3 Minnesota sweeps No. 1 Wisconsin
The No. 3 Minnesota volleyball team swept No. 1 Wisconsin on Wednesday 25-20, 25-18, 25-14 in Madison, Wisconsin. With the win, the Golden Gophers improve to 14-2 overall and 6-1 in the Big Ten.
Wisconsin was handed its first loss of the Big Ten season, and are 14-2 overall and 6-1 in league action. Minnesota snapped a nine-match Badger win streak. It was also the first Big Ten loss for the Badgers since the 2015 Golden Gophers defeated them on Oct. 17, 2015, which snapped Wisconsin's 18-match Big Ten win streak.
Cycling
Norway's Halvorsen strikes under 23 gold in Qatar
Kristoffer Halvorsen of Norway sprinted to gold in the men’s under 23 road race at the UCI Road World Championships in Doha, Qatar.
...
Football
Jose Mourinho's Man United will be revealed over next week of games
Now we shall see what Jose Mourinho has concluded from his first two months of competitive football at Manchester United. Over the next six days, he will face Liverpool in the traditional no-quarter-asked-because-none-is-ever-given-anyway North-West knife fight, then it's Fenerbahce in a Europa League that he has promised to take seriously. Then he returns to his former realm in West London, Stamford Bridge, site of three Premier League triumphs but also of his greatest failure and most ignominious sacking.
...
Olympics
Alistair Brownlee becomes first man to retain Olympic triathlon gold ahead of brother Jonathan in dominant display in Rio6
It was a wonderful sound drifting across Copacabana beach as God Save The Queen blasted out over the sand. And, with Sugarloaf Mountain providing a sumptuous background, there was the Union flag hanging from not one but two poles. What a sight it was. What a moment of uplift. And what a performance it marked. Alistair Brownlee had just won gold in the Olympic triathlon, while his brother Jonny had come in second.
...
Finale of Lupin III 2015
March 2016
Lorem ipsum dolor sit amet, consectetur adipiscing elit. Cras vulputate dapibus laoreet. Proin est nisi, hendrerit eget tincidunt et, euismod non purus. Sed malesuada libero et finibus hendrerit. Sed tincidunt purus felis, at dignissim nisi pellentesque nec. Vestibulum a odio est. Donec venenatis eros id purus vehicula blandit. Nulla facilisi.
...


| Santicizer 2148 General Information
-
| Synonyms: |
Alkyl aryl phosphate ester |
| Molecular Weight: |
Proprietary |
| Chemical Category: |
Phosphates |
Usage and Performance Characteristics
-
| Manufacturer: |
Ferro Corporation |
| Outstanding Properties: |
Low smoke & flame spread, low temperature flexibility |
| Used for Polymeric Materials: |
PVC |
| Used for Products: |
Cable & wire, selants, high solids coatings |
Physical Properties
-
| Aggregate State at 25°C: |
Liquid, oily |
| Boiling Point, °C: |
230.0 @ 1.33 kPa |
| Density, kg/m3: |
1,066.45 (25°C) |
| Kinematic Viscosity, cSt: |
3.5 (approx) (100°C) |
| Vapor Pressure, kPa: |
0.01333 (80°C) |
Chemical Properties
-
| Acid Number, mg KOH/g: |
0.20 (max) |
Optical Properties
-
| Color, Platinum-Cobalt Scale: |
<200 |
| Refractive Index: |
1.497 (n25D) |
Hazard-Related Data
-
| Flash Point Temperature, °C: |
229.44 |
| HMIS Personal protection: |
Chemical-resistant gloves, eye protection |
Plasticizers Database (2nd Electronic Edition) Copyright © 2004 by ChemTec Publishing |


ZooKeeper: Because Coordinating Distributed Systems is a Zoo
ZooKeeper is a high-performance coordination service for distributed applications. It exposes common services - such as naming, configuration management, synchronization, and group services - in a simple interface so you don't have to write them from scratch. You can use it off-the-shelf to implement consensus, group management, leader election, and presence protocols. And you can build on it for your own, specific needs.
The following documents describe concepts and procedures to get you started using ZooKeeper. If you have more questions, please ask the mailing list or browse the archives.
-
ZooKeeper Overview
Technical Overview Documents for Client Developers, Adminstrators, and Contributors
- Overview - a bird's eye view of ZooKeeper, including design concepts and architecture
- Getting Started - a tutorial-style guide for developers to install, run, and program to ZooKeeper
- Release Notes - new developer and user facing features, improvements, and incompatibilities
-
Developers
Documents for Developers using the ZooKeeper Client API
- API Docs - the technical reference to ZooKeeper Client APIs
- Programmer's Guide - a client application developer's guide to ZooKeeper
- ZooKeeper Java Example - a simple Zookeeper client appplication, written in Java
- Barrier and Queue Tutorial - sample implementations of barriers and queues
- ZooKeeper Recipes - higher level solutions to common problems in distributed applications
-
Administrators & Operators
Documents for Administrators and Operations Engineers of ZooKeeper Deployments
- Administrator's Guide - a guide for system administrators and anyone else who might deploy ZooKeeper
- Quota Guide - a guide for system administrators on Quotas in ZooKeeper.
- JMX - how to enable JMX in ZooKeeper
- Hierarchical quorums
- Observers - non-voting ensemble members that easily improve ZooKeeper's scalability
-
Contributors
Documents for Developers Contributing to the ZooKeeper Open Source Project
- ZooKeeper Internals - assorted topics on the inner workings of ZooKeeper
- Miscellaneous ZooKeeper Documentation
-
BookKeeper Documentation
BookKeeper is a highly-available system that implements high-performance write-ahead logging. It uses ZooKeeper for metadata, which is the main reason for being a ZooKeeper contrib.


So the current dosage beings when I'm put in the Hospital for Schizophrenia about a year after I was diagnosed. I came in delusional, hallucinating, and thinking I was going to be killed by the government so I had to kill myself to evade them. After hearing all these voices and delusions spinning in my head my Dad takes me in. By this point I had been awake for almost 2 days and was quite agitated. In the hospital they immediately gave me Abilify and Paxil and I drifted off to sleep.
The next day I woke up and started wandering the halls of the psych unit at 5am still hearing evil voices through the speakers of the ceiling. After meeting with the doctor later that day I was upped from 15mg to 25mg abilify, and from 20mg to 30 mg paxil, I was also given 50mg seroquel at bedtime to help me sleep a little. A few days after being on this combo I was back down to Earth and they sent me out of the hospital and on my way.
I felt no emotions at all, just eternal nothingness. Antipsychotics simply sucked all the feeling out of me, which I both love and despise. On the one hand I can think clearly and don't hallucinate, on the other nothing effects me whatsoever. I used to be a somewhat social person, now the few times I'm with friends I simply stare off into space and have trouble thinking of anything to say. I'm like a zombie set on blank. The world goes by around me as I sit and experience total oblivion to all the things I like and despise. Maybe one day I won't need all these meds and I can remember what it was like before schizophrenia, and learn to laugh, love, and feel again.
Experience Reports are the writings and opinions of the individual authors who submit them.
Some of the activities described are dangerous and/or illegal and none are recommended by Erowid.


Task Tracker
v2.0
| Create a Task |
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RD.Camera Class
Camera wraps all the info about the camera (properties and view and projection matrices)
Constructor
RD.Camera
()
Item Index
Methods
Methods
applyController
-
dt
-
e
Used to move the camera (helps during debug)
Parameters:
-
dt
Numberdelta time from update
-
e
Eventmouse event or keyboard event
getFront
-
dest
gets the front vector normalized
Parameters:
-
dest
Vec3[Optional]
Returns:
front vector
getLocalVector
-
v
-
result
transform vector (only rotates) from local to global
Parameters:
-
v
Vec3 -
result
Vec3[Optional]
Returns:
local point transformed
getLocalVector
-
v
-
result
transform point from local to global
Parameters:
-
v
Vec3 -
result
Vec3[Optional]
Returns:
local point transformed
getRay
-
x
-
y
-
[viewport=gl.viewport]
-
[out]
gets the ray passing through one pixel
Parameters:
-
x
Number -
y
Number -
[viewport=gl.viewport]
Array optional -
[out]
Object optional{ origin: vec3, direction: vec3 }
Returns:
ray object { origin: vec3, direction:vec3 }
getRayPlaneCollision
-
x
-
y
-
position
-
normal
-
[result=vec3]
-
[viewport=vec4]
given a screen coordinate it cast a ray and returns the collision point with a given plane
Parameters:
-
x
Number -
y
Number -
position
Vec3Plane point
-
normal
Vec3Plane normal
-
[result=vec3]
Vec3 optional -
[viewport=vec4]
Vec4 optional
Returns:
the collision point, or null
lookAt
-
position
-
target
-
up
configure view of the camera
Parameters:
-
position
Vec3 -
target
Vec3 -
up
Vec3
move
-
v
move the position and the target
Parameters:
-
v
Vec3
moveLocal
-
v
move the position and the target using the local coordinates system of the camera
Parameters:
-
v
Vec3
orthographic
-
frustum_size
-
near
-
far
-
aspect
changes the camera to orthographic mode (frustumsize is top-down)
Parameters:
-
frustum_size
Number -
near
Number -
far
Number -
aspect
Number
perspective
-
fov
-
aspect
-
near
-
far
changes the camera to perspective mode
Parameters:
-
fov
Number -
aspect
Number -
near
Number -
far
Number
project
-
vec
-
[viewport=gl.viewport]
-
[result=vec3]
projects a point from 3D to 2D
Parameters:
-
vec
Vec3coordinate to project
-
[viewport=gl.viewport]
Array optional -
[result=vec3]
Vec3 optional
Returns:
the projected point
rotate
-
angle
-
axis
-
[center=null]
rotate around its target position
Parameters:
-
angle
Numberin radians
-
axis
Vec3 -
[center=null]
Vec3 optionalif another center is provided it rotates around it
rotate
-
angle
-
axis
rotate over its position
Parameters:
-
angle
Numberin radians
-
axis
Vec3
rotateLocal
-
angle
-
axis
rotate over its position
Parameters:
-
angle
Numberin radians
-
axis
Vec3in local coordinates
testBox
-
center
-
halfsize
test if box is inside frustrum (you must call camera.extractPlanes() previously to update frustrum planes)
Parameters:
-
center
Vec3center of the box
-
halfsize
Vec3halfsize of the box (vector from center to corner)
Returns:
CLIP_OUTSIDE or CLIP_INSIDE or CLIP_OVERLAP
testSphere
-
center
-
radius
test if sphere is inside frustrum (you must call camera.extractPlanes() previously to update frustrum planes)
Parameters:
-
center
Vec3 -
radius
Number
Returns:
CLIP_OUTSIDE or CLIP_INSIDE or CLIP_OVERLAP
unproject
-
vec
-
[viewport=gl.viewport]
-
[result=vec3]
projects a point from 2D to 3D
Parameters:
-
vec
Vec3coordinate to unproject
-
[viewport=gl.viewport]
Array optional -
[result=vec3]
Vec3 optional
Returns:
the projected point
updateMatrices
()
update view projection matrices
updateVectors
-
model_matrix
update camera using a model_matrix as reference
Parameters:
-
model_matrix
Mat4
Properties
aspect
Number
aspect (width / height)
Default: 1
far
Number
far distance
Default: 10000
fov
Number
fov angle in degrees
Default: 45
frustum_size
Number
size of frustrum when working in orthographic
Default: 50
near
Number
near distance
Default: 0.1
position
Vec3
Position where the camera eye is located
target
Vec3
Where the camera is looking at, the center of where is looking
type
Number
the camera type, RD.Camera.PERSPECTIVE || RD.Camera.ORTHOGRAPHIC
Default: RD.Camera.PERSPECTIVE
up
Vec3
Up vector
Default: [0,1,0]


Snookes1516.github.io
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Behavior:
Connection request is combined with either a read or write request
Blocks of data are sent in a fixed 512 byte size (each block must be acknowledged for error control)
A block less than 512 bytes indicates the end of the stream
The first two bytes of a TFTP header indicates the request type and format
– \x00\x01 indicates a read request
– \x00\x02 indicates a write request
– \x00\x03 indicates the data block
– \x00\x04 is an acknowledgement
– \x00\x05 indicates an error
– \x00\x06 is an optional acknowledgement
Read and Write request format:
– \x00\x01 for read | \x00\x02 for write
– File Name
– Null byte - \x00
– Mode – Binary, ASCII or Mail
– Null byte - \x00


Hi, it's possible that this is your first access to the Scaffolder Project. So, relex and enjoy our hardwork for you for a moment.
And... that is good! Let's get to the job again.
Just access the menu on the left to see what we have built automagically.
All of our documentation is public and built with Google Docs, helping us to improve and add more examples in the future.
Just click (or touch) here to access.
It will always be a pleasure to help our customers, you can use our support e-mail group any time that our developer team will respond at brazilian commercial hours and within 1 (one) business day.
Just click (or touch) to send us an e-mail.


Contact the Editoral Board
Home
About
Contact SMR Executive
Board
Instructions for Authors
Submissions
Editor
Professor David J. Smith
University of Aberdeen
d.j.smith@abdn-ac-uk
(change - to .)
Board Members
To follow...
Sponsors
University of Glasgow, Music
University of Edinburgh, Music
University of Aberdeen, Music
Royal Conservatoire of Scotland


Sending, Receiving, and other Fundamentals
Lesson 1: Sending and Standard Out
Lesson 2: Receiving
Lesson 3: Telephone, Names, and Processes
Lesson 4: Persistent Send and Peek
Lesson 5: Join Operator
Name Privacy
Lesson 6: Unforgeable Names and Acks
Lesson 7: Bundles
Lesson 8: State Channels
Crypto Channls, and Offchain Interaction


The SUCCESSOR and PREDECESSOR for a node x in time O(1) can be found by adding pointers to successor and predecessor of x inside the node structure.
After inserting node x do the following:
• Function CALL: TREE-SUCCESSOR(x), TREE-PREDECESSOR(x).
• Determine successor and predecessor.
• Setup required fields in x.
• UPDATE SUCC(x) filed of predecessor and PRED(x) field of successor and set the pointer point to x.
• Upon deletion of a node UPDATE SUCC(x) filed of predecessor and PRED(x) field of successor and set the pointer point to each other.
The MINIMUM and MAXIMUM are global properties of trees, can be maintained directly.
After inserting node x:
• Check if key (k), and.
• UPDATE: Pointer to MINIMUM and/or MAXIMUM.
• On deletion of minimum or maximum element in a tree, UPDATE: MINIMUM and/or MAXIMUM to it successor and/or predecessor.
Hence, these operations run in O(1) and without effecting the running time of other operations.
Red Black Tree is a special type of tree and each node contains five fields, p for parent, left for left child, right for right child, key for data value and color for color of the node.
Since the black height of a node can be calculated using the information in the left child, right child and itself, according to theorem 14.1, it is possible to maintain the black height of the nodes of red-black tree as attributes such that the asymptotic performance remains the same.
Black height of a node x:
• If the color of the node x is red, then the children of node x must be black.
• If the color of the node x is black and one of the children is black, then the black height of node x is the black height of its children plus one.
• If the color of the node x is black and it two children are red, then the black height of node x is equals to the black height of its children.
Consider that,
• x is any node in the red-black tree.
• The black height of x is x.bh .
• Black height of left child of x is x.left.bh
• Black height of right child of x is x.right.bh
Since black height of a node is the number of black nodes in the descendants, updating black height of a node requires to updating the black height of its parent also. That is, this process ends on updating black height of the root node.
When the following actions occurred, the black height of few a nodes may change:
• A new node inserted into red-black tree:
• A node is deleted from the red-black tree:
When a node tree is inserted into a red-black tree or deleted from a red-black tree, red-black tree properties may be violated. To fix these violations, rotations are occurred. Rotations may cause change in the color of nodes. When the color is changed, the black height of nodes may change.
The change in black height of a node propagates up to the root node. Thus, the updating black height takes .
No change in asymptotic performance:
Insertion operation:
According to theorem 14.1, inserting a node into red-black tree takes O(log n) time and insertion leads to at most two rotation.
• Each rotation takes O(log n) time.
• For each rotation, updating black height of nodes up to root node takes O(log n).
•
Thus, the total time to insert a node is O(log n).
Deletion operation:
According to theorem 14.1, deleting a node form a red-black tree leads to at most three rotations.
• Each rotation takes O(log n) time.
• For each rotation, updating black height of nodes up to root node takes O(log n).
• Calculating black height can be accomplished in constant time O(1).
Thus, the total time to insert a node is O(log n).
Therefore, black height of node in a red-black tree can be maintained such that the running times of red-black tree operations remain same.
Maintaining depths:
The depth of a node completely depends on the depth of its parent node. If the depth of a node is changed then all the depths of its descendants must be changed. For example, if the depth of the root node is changed, then the depths of all the nodes in the tree must be changed. It is possible to maintain the depth of a node as the attribute in the node. But, it affects the running time of the basic operations of the red-black tree. Because updating depth may take time.
Associative binary operator:
A binary operator is said to be associative if the operator follows the associative property for the given operands.
In more concrete words a binary operator would be said associative if it has the following form:
Augmented Data structure:
A data structure is said to be augmented when an additional attribute is added to it.
Here the red black tree is augmented by adding an additional attribute f to each node so that
Where a is an attribute of each node of the tree and is the in-order traversal of the tree who has x as the root.
Maintaining f attribute of each node after rotation:
Suppose there is x rooted tree T, the additional attribute value of root node x is. After the right rotation left child becomes the root of the tree refer Figure 1. When x rooted tree is rotated right then suppose the new root of tree T is y.
• The additional attribute value of new root node y is same as old root node that is. It is because the value of attribute f is calculated by applying associated binary operator on in-order traversal of tree.
• The rotation of tree only changes the in-order traversal of tree but operation in associated binary operator does not depend on the order.
• After rotation the value of additional attribute f of node x is the resultant of associated binary operator on and right child ofbefore rotation.
• The f value of all remaining node would remain same.
The f value of only 2 node get change after rotation, Therefore the time required to update the f after rotation is.
Maintaining size attribute of every node after rotation in order-statistic tree:
The above stated procedure can also be used to maintain the size attribute of each node after left or right rotation.
The modification required in above procedure is to replace attribute f with size and use plus (+) as associated binary operator.
Consider the following tree T to display the update size attribute of each node after rotation:
Figure 1
Explanation:
• After right rotation the size new root node y is same as size of old root node x that is 19.
• After right rotation the size node x becomes:
Add one more in size for the node x itself, therefore the total size of
• The size of remaining node or sub-tree is same before rotation.
All these modification will requiretime.
Therefore, to maintain the size attribute of every node after rotation in order-statistic tree require time.
An operation ENUMERATE(x, a, b) is augmented with the REB-BLACK-TREE with root x which returns all the key values k in the tree where. Implementation of RB-ENUMERTAE in where m is total number of key values in the tree and n is the number of internal nodes in the tree.
Red Black Tree is a special type of tree in which each node contains an extra bit for the storage of the color of that node. So Red Black Tree contains five fields p for parent, left for left child, right for right child, key for data value and color for color of the node.
The implementation of the ENUMERATE(x, a, b) is as where x is the root of the RB-Tree and a and b are any nodes in the tree.
ENUMERATE(x, a, b)
// first search the node a in the tree
1.
2. if
3.
// scan all the nodes from a to b
4. while
5. print “start”
6.In the above algorithm, the tree search and successor are called so we can modify the procedure TREE-SEARCH so that it results in the minimum element in the tree which has value greater than a if a is not present in the tree. This process takes time to run.
Now the function TREE-SUCCESSOR is called until a node which has key value greater than the value of node b is found. And this function will be called in m times.
So if any function starting at any node and makes m successive calls to Tree-Successor will take time interval here h is the height of the tree. Thus the function ENUMERATE should be implemented in time.
We can use Successor and Predecessor function pointers to produce the result of m keys with running time. So that total running time will be time.
Hence, ENUMERATE(x, a, b) augmented to the RB-Tree with root x which returns all the key values k in the tree where and it runs in.


Our Schedule is still empty
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Vision
Deployment of clustered software is complicated at present. One needs to install, configure, deploy, set up monitoring and scale the cluster all by themselves. This project aims to provide infrastructure teams a simple but powerful tool for cluster deployment. In future, the user should just be able to specify what he wants (e.g. 'a Cassandra cluster which can handle 3million read/write operations per second with a 50-50 read-write ratio, total cluster capacity of 5 Terabyte storage, and can sustain failure of one availability zone') and should get a cluster created satisfying the requirements in a short amount of time.


image_processor_server module¶
-
class
image_processor_server.
Image
(*args, **kwargs)¶ Bases:
pymodm.base.models.MongoModel
-
exception
DoesNotExist
¶ Bases:
pymodm.errors.DoesNotExist
-
exception
MultipleObjectsReturned
¶ Bases:
pymodm.errors.MultipleObjectsReturned
-
image_formats
¶ A field that stores a regular Python dictionary.
-
image_name
¶ A field that stores unicode strings.
-
objects
¶ The default manager used for
MongoModel
instances.This implementation of
BaseManager
usesQuerySet
as its QuerySet class.This Manager class (accessed via the
objects
attribute on aMongoModel
) is used by default for all MongoModel classes, unless another Manager instance is supplied as an attribute within the MongoModel definition.Managers have two primary functions:
Construct
QuerySet
instances for use when querying or working withMongoModel
instances in bulk.Define collection-level functionality that can be reused across different MongoModel types.
If you created a custom QuerySet that makes certain queries easier, for example, you will need to create a custom Manager type that returns this queryset using the
from_queryset()
method:class UserQuerySet(QuerySet): def active(self): '''Return only active users.''' return self.raw({"active": True}) class User(MongoModel): active = fields.BooleanField() # Add our custom Manager. users = Manager.from_queryset(UserQuerySet)
In the above example, we added a users attribute on User so that we can use the active method on our new QuerySet type:
active_users = User.users.active()
If we wanted every method on the QuerySet to examine active users only, we can do that by customizing the Manager itself:
class UserManager(Manager): def get_queryset(self): # Override get_queryset, so that every QuerySet created will # have this filter applied. return super(UserManager, self).get_queryset().raw( {"active": True}) class User(MongoModel): active = fields.BooleanField() users = UserManager() active_users = User.users.all()
-
processed_time
¶ A field that stores unicode strings.
-
upload_time
¶ A field that stores unicode strings.
-
exception
-
image_processor_server.
add_image_to_db
(in_dict)¶ Adds new image to image database list via image name The image name, corresponding b64 str, and upload timestamp are added to the image database to maintain proper, permanent record of uploaded images. :param in_dict: input with image name and b64 str :type in_dict: dict
- Returns
image name the data was saved under in database
- Return type
str
-
image_processor_server.
add_inverted_image_to_db
(b64_str, name)¶ Adds inverted image to image database list via image name The inverted image’s b64 str and processing timestamp are added to the image database under the original image name to maintain proper, permanent record of uploaded images. :param b64_str: b64 str to be added to database :type b64_str: str :param name: image name under which the str added :type name: str
- Returns
image name the data was saved under in database
- Return type
str
-
image_processor_server.
b64_string_to_ndarray
(b64_string)¶ Converts image b64 string to ndarray The image must be in the ndarray format for inversion. :param b64_string: image in b64 str format :type b64_string: str
- Returns
image in ndarray format
- Return type
numpy.ndarray
-
image_processor_server.
generate_image_list
()¶ Generates list of all images stored in database The list of images are provided for the user to choose from to perform selected actions upon, including display and download. :param None:
- Returns
sorted list of all images stored in database
- Return type
list
-
image_processor_server.
get_b64_from_db
(image_name)¶ Obtains and returns b64 str corresponding to image name When a get request is made, the input must be validated before the corresponding b64 str is collected from the database and returned to the client. Both original and inverted image requests are accommodated. Only images present in the database are available for client selection. :param image_name: image for which b64 str requested :type image_name: str
- Returns
results of post request; b64 str if success int: HTTP status code
- Return type
str
-
image_processor_server.
get_im_details
(image_name)¶ Obtains and returns details corresponding to image name When a get request is made, the input must be validated before the corresponding details are collected from the database and returned to the client. Both original and inverted image requests are accommodated. Only images present in the database are available for client selection. :param image_name: image for which b64 str requested :type image_name: str
- Returns
results of post request int: HTTP status code
- Return type
str
-
image_processor_server.
get_image_list_from_db
()¶ Returns list of images in database If requested, all recorded images (original and processed) saved on the database are returned. An image can then be selected to display or download. :param None:
- Returns
all stored images int: HTTP status code
- Return type
list
-
image_processor_server.
is_image_in_database
(name)¶ Checks if image has previously been added to database To be added to the image database, the image must not previously have been added to the database. :param name: image name :type name: str
- Returns
if name in database, True; if not, False
- Return type
bool
-
image_processor_server.
is_inverted_in_database
(name)¶ Checks if image has previously been inverted To be inverted and added to the image database, the image must not previously have been inverted and added. :param name: image name :type name: str
- Returns
if name in database, True; if not, False
- Return type
bool
-
image_processor_server.
locate_b64_string
(im_name, which='orig')¶ Locates b64 str corresponding to image name and status The b64 string was stored under the image name. To invert or display the image, the b64 str is needed for conversion to the proper data type. The b64 string can be located for the original or inverted image. :param im_name: image name :type im_name: str :param which: status of image (default “orig) :type which: str
- Returns
b64 str corresponding to image
- Return type
str
-
image_processor_server.
locate_details
(im_name, which='orig')¶ Locates details corresponding to image name and status Image details were stored under the image name. Details can be located for the original or inverted image. If the image is original, the upload time is returned. If the image is inverted, the processed time is returned. :param im_name: image name :type im_name: str :param which: status of image (default “orig) :type which: str
- Returns
upload or processed time of image
- Return type
str
-
image_processor_server.
ndarray_to_b64_string
(img_ndarray)¶ Converts image ndarray to b64 str The image must be in the b64 str format to be added to the database and sent to the client. :param img_ndarray: image in ndarray format :type img_ndarray: numpy.ndarray
- Returns
image in b64 str format
- Return type
str
-
image_processor_server.
post_invert_image
()¶ Inverts image and adds to the image database via name When a post request is made to /api/invert_image, the input must be validated and checked to confirm the image is already in the database before the image is inverted and stored under the original image name. :param None:
- Returns
results of post request; b64 str if success int: HTTP status code
- Return type
str
-
image_processor_server.
post_new_image
()¶ Adds new image to the image database via name When a post request is made to /api/upload_image, the input must be validated and checked to confirm the image isn’t already in the database before the image name, corresponding b64 string, and upload time are added to the image database. :param None:
- Returns
results of post request int: HTTP status code
- Return type
str
-
image_processor_server.
process_image_inversion
(ndarray)¶ Inverts ndarray to invert image The image must be in the ndarray format for inversion. This ndarray can then be inverted to obtain an ndarray that can further be converted into a b64 str and displayable image. :param ndarray: image in ndarray format :type ndarray: numpy.ndarray
- Returns
inverted image in ndarray format
- Return type
numpy.ndarray
-
image_processor_server.
return_name
(image_name)¶ Converts inverted image name to original name Inverted images are stored in the database under the image they’re derived from. As such, to locate information corresponding to the inverted image, the database must be queried via the original image name. :param image_name: inverted image name :type image_name: str
- Returns
original image name
- Return type
str
-
image_processor_server.
verify_image_info
(in_dict)¶ Verifies post request was made with correct format The input dictionary must have the appropriate data keys and types, or be convertible to correct types, to be added to the image database. :param in_dict: input with image name and b64 str :type in_dict: dict
- Returns
if error, returns error message bool: if input verified, returns True
- Return type
str
-
image_processor_server.
verify_image_name
(in_dict)¶ Verifies post request was made with correct format The input dictionary must have the appropriate data keys and types, or be convertible to correct types, to be added to the image database. :param in_dict: input with image name :type in_dict: dict
- Returns
if error, returns error message bool: if input verified, returns True
- Return type
str
-
image_processor_server.
verify_name_input
(image)¶ Verifies get request was made with correct format The input name in the get URL must have the appropriate data type and correspond to an image in the database to locate corresponding information. :param image: image name :type image: str
- Returns
if error, returns error message bool: if input verified, returns True
- Return type
str


--- layout: post title: Creating your own VSCode Theme! date: 2020-05-27 18:04:42 -0700 description: Create the perfect theme for VSCode. Plus template and instructions to get you started! subtitle: Create your own VSCode theme! Plus a template and instructions to get you started. Easy, breezy! background: '/assets/Images/brand/colorTheme.jpg' categories: Technology buttonUrl: 'https://github.com/jjoocceeee/vs-code-color-theme-boiler' buttonText: Check it out here! highlightSecondary: E0B8BA ---
Creating your own VSCode color theme is actually pretty simple. Like wayyyyy simple. A Visual Studio Code Color theme is just a set of JSON key-value pairs. The key is the type of object, and the value is the color of that object.
Although the process is very simple, there are many, many, many key value pairs to assign. To make things even more complicated, there are different theme sources for different languages. So your theme may look great in Python, but looks awful in C#, or Markdown, or javaScript, or whatever.
I created a boiler plate that seperates the keys value pairs into language sections. I also added comments to help you understand what key the value is changing.
Just fork the repository, and you are off to the races!
If you want to see what you could make, checkout out the color theme I created with this template, it is Here!!!!


Bloor
This page contains an index of all the individuals in the database with the surname of Bloor. Selecting the person’s name will take you to that person’s individual page.
| Given Name | Birth | Death | Partner | Parents |
|---|---|---|---|---|
| Albert Edward | 1933 | Tressider, Bessie | ||
| Arthur Roy | 1893 | 1948 | Bloor, Albert Edward Tressider, Bessie | |
| Clarence Albert | 1895 | 1959 | Groves, Dorothy Mary G., Bongers, Ella Edith | Bloor, Albert Edward Tressider, Bessie |
| Esma Jessie | 1903 | 1963 | Chapman, Leslie R. S. | Bloor, Albert Edward Tressider, Bessie |
| Henry Thomas Treloar | 1897 | 1947 | Bloor, Albert Edward Tressider, Bessie | |
| Herbert George | 1899 | 1963 | Bloor, Albert Edward Tressider, Bessie | |
| Norman William | 1908 | 1963 | Bloor, Albert Edward Tressider, Bessie | |
| [Living] | Bloor, Clarence Albert Groves, Dorothy Mary G. | |||
| [Living] | Bloor, Clarence Albert Groves, Dorothy Mary G. | |||
| [Living] | Richards, Ronald C.H. | Bloor, Albert Edward Tressider, Bessie |


Pitbull Adoption Survey Form
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CCA Model Visualization¶
As shown below, visualization of a CCA model consists of three linked views, each providing a different level of abstraction. The most abstract level is the Correlation View, where each column displays the structure coefficients for one of the canonical components. The scatterplot in the Simulation View shows how well each individual run is described by the correlations found in the ensemble overall. The least abstract view is the Variable Table, which provides the raw data values contained in the original table file. The views are all linked, so changing the selection in one view will modify the selection in one or more of the other views. As with most Slycat™ models, the views are arranged with the ensemble level view in the upper left, the midrange view in the upper right, and the lowest level view at the bottom.


{% extends 'base.html' %} {% block content %}
It looks like you don't have any palettes yet. Create your own, star the image below, or pick a few from the gallery.
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Adenta residents petition MCE to halt construction of illegal building project
A group of residents of Ala-Lomo and Aprotech Street at Bridge junction in Adenta have petitioned the Adenta Municipality Chief Executive to stop the ongoing construction of a private building project.
They say the project which is being built on the greenbelt, near a storm drain causes the area to flood as it is on a waterway.
The greenbelt and storm drain in the area is meant to help floodwater move downstream, away from the community.
But recent torrential rains on November 10 had nowhere to flow to.
The water simply filled the foundation trenches on the construction site and also flowed backstream causing flooding due to blocked drains, gutters and land erosion.
According to the petitioners, the private developer responsible for the building project is retired DCOP of the Ghana Police Service, Moses Atimbilla.
They claim he has not been able to show a building permit or title deed for the land on which he is building at Bridge Junction opposite SSNIT Block 79 at Housing-Down, in Adenta.
Several other people have also claimed the land to be their own.
Dr Aryee-Boi, a concerned community member and structural engineer, who leads the petitioners, rallied community residents to clean-up the mess left behind by the floods.
The group of residents also demolished shack structures sitting on the greenbelt that were used for small businesses.
Dr Aryee-Boi is also calling on the Urban Roads Department of the Accra Metropolitan Assembly to make themselves available in the local area to clear the pipe culverts that require special tools and skill to help avert future flooding issues in the area.


I am a rising senior at Tufts University studying computer science, but I am originally from Long Island, New York. When I am not coding (see the projects for some cool stuff I have built), I enjoy painting, finding new restaurants with friends and cooking. My most recent obsession is Game of Thrones. I am excited to announce that I will be returning to Google for a software engineer internship in their NYC office this summer.
Some of my favorite classes I've taken: Data Structures, Database Systems, Networks and Prtocols, Algorithms, Programming Languages, Linear Algebra, Painting Foundations
GPA: 3.88/4.0
embroidery, painting, good food, trying to keep all of my plants alive


This page is my review of games I played in the past.
This page is my review of games I played in the past.
Half Life 1 by Valve
The closest thing to a revolutionary step the genre has ever taken. Through a series of subtle and artistic design decisions, Half-Life creates a reality that is self-contained, believable, and thoroughly engaging.
World At Warchaft by Blizzard
Classic is launching on August 27th for anyone with a WoW subscription and closed beta testing begins for a select few on May 15th. I was lucky enough to get my hands on a prefabricated level 40 character at a preview event in Irvine, California. The ensuing hours of laughter and high jinks reassured me that WoW Classic has much more to offer than just nostalgia. WoW Classic is a faithful recreation of the illustrious MMO as it existed in patch 1.12 . There are a few modern amenities like a somewhat enhanced suite of graphics options, modern server architecture, and access to Battle.net social features but otherwise what’s here is as true as possible to the more-than-decade-old source material.
From a graphical and technical fidelity standpoint, there can be no question that retail WoW is superior. The combat is flashier, boss mechanics are more pronounced, and the quests more intricate. Battle for Azeroth is refined, polished, and soon to be brimming with new, worthwhile multiplayer content like the Azshara’s Eternal Palace raid revealed in a recent stream. But in spite of these factors World of Warcraft Classic is far and away more desirable as an MMO to me in 2019. Simply put, WoW Classic gives you both more reasons and opportunities to have meaningful interactions with other players. The world is filled to the brim with abstruse and challenging elements that coerce you to make and maintain relationships with others if you want to succeed. This multiplayer-first motif is evident in class design, where a low-level Warrior must enlist the aid of a healer to survive the most basic of combat encounters. It’s evident in traversal where lengthy travel times can be reduced by a Mage’s portal or Warlock’s summoning ritual. But most of all, it’s evident in the unified single-shard ecosystem where your experience is directly affected by the choices of other players.
Portal by Valve
The more intricate the rat maze, the more necessary the reward -- part of Portal's sinister genius lies in the cheese-crumb trail it leaves. Puzzle solving is an end in itself, and the game's Skinner boxes (note that, like the computer intelligence pulling our strings, Valve remotely tracks player progress, indirectly seeing what stumps us) are supremely entertaining to crack in on-again-off-again sessions.


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We have prepared a VIP LOUNGE for you. Free drinks, comfy couch, and luggage storage!
Moreover, our CEO, Mr.Hiroshi Nose will be there with our sales and R&D team to help you.
Feel free to visit us at any times!