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<div class="toc-wrapper">
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<ul class="search-results"></ul>
<ul id="toc" class="toc-list-h1">
<li>
<a href="#introduction" class="toc-h1 toc-link" data-title="Introduction">Introduction</a>
</li>
<li>
<a href="#quick-start" class="toc-h1 toc-link" data-title="Quick Start">Quick Start</a>
<ul class="toc-list-h2">
<li>
<a href="#prerequisites" class="toc-h2 toc-link" data-title="Prerequisites">Prerequisites</a>
</li>
<li>
<a href="#library" class="toc-h2 toc-link" data-title="Library">Library</a>
</li>
<li>
<a href="#job-data" class="toc-h2 toc-link" data-title="Job Data">Job Data</a>
</li>
<li>
<a href="#jobs" class="toc-h2 toc-link" data-title="Jobs">Jobs</a>
</li>
<li>
<a href="#client-initialization" class="toc-h2 toc-link" data-title="Client Initialization">Client Initialization</a>
</li>
<li>
<a href="#scheduling-jobs" class="toc-h2 toc-link" data-title="Scheduling Jobs">Scheduling Jobs</a>
</li>
<li>
<a href="#deleting-jobs" class="toc-h2 toc-link" data-title="Deleting Jobs">Deleting Jobs</a>
</li>
<li>
<a href="#running-workers" class="toc-h2 toc-link" data-title="Running Workers">Running Workers</a>
</li>
</ul>
</li>
<li>
<a href="#retrying" class="toc-h1 toc-link" data-title="Retrying">Retrying</a>
<ul class="toc-list-h2">
<li>
<a href="#fixed-interval-retry-policy" class="toc-h2 toc-link" data-title="Fixed Interval Retry Policy">Fixed Interval Retry Policy</a>
</li>
<li>
<a href="#exponential-retry-policy" class="toc-h2 toc-link" data-title="Exponential Retry Policy">Exponential Retry Policy</a>
</li>
</ul>
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<li><a href='https://www.yerbie.dev'>Yerbie Home</a></li>
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<div class="content">
<h1 id='introduction'>Introduction</h1>
<p>Yerbie is a job queue and scheduler. A system like Yerbie is used to distribute work across threads or machines, or to schedule code to run at a certain point in the future.</p>
<p>To initiate a job, a client sends a request to Yerbie indicating a queue, data and delay, and Yerbie then makes that data available on the queue after the specified delay.</p>
<p>A worker polls, and runs a job associated with the data when it is available on the queue.</p>
<p>Currently, Yerbie has a Java client library with more language support planned.</p>
<h1 id='quick-start'>Quick Start</h1><h3 id='prerequisites'>Prerequisites</h3>
<ul>
<li>Docker</li>
<li>Redis (>= 3.0)</li>
</ul>
<ol>
<li>Pull the Yerbie image locally by running <code>docker pull yerbie/yerbie-server</code>.</li>
<li>Start the Yerbie server with <code>docker run yerbie/yerbie-server</code>.</li>
</ol>
<p>Yerbie assumes Redis is accessible on <code>localhost</code> port <code>6379</code> and will start listening for requests on port <code>5865</code>.</p>
<h2 id='library'>Library</h2>
<p>The client library exposes an easy to use interface to send requests to Yerbie and to run jobs from a queue when they become available.</p>
<blockquote>
<p>Add the Yerbie client library as a dependency with the latest version:</p>
</blockquote>
<div class="highlight"><pre class="highlight java tab-java"><code><span class="c1">// Yerbie is available on the Maven Central Repository</span>
<span class="o"><</span><span class="n">dependencies</span><span class="o">></span>
<span class="o"><</span><span class="n">dependency</span><span class="o">></span>
<span class="o"><</span><span class="n">groupId</span><span class="o">></span><span class="n">dev</span><span class="o">.</span><span class="na">yerbie</span><span class="o"></</span><span class="n">groupId</span><span class="o">></span>
<span class="o"><</span><span class="n">artifactId</span><span class="o">></span><span class="n">yerbie</span><span class="o">-</span><span class="n">java</span><span class="o"></</span><span class="n">artifactId</span><span class="o">></span>
<span class="o"><</span><span class="n">version</span><span class="o">></span><span class="mf">1.1</span><span class="o">.</span><span class="mi">0</span><span class="o"></</span><span class="n">version</span><span class="o">></span>
<span class="o"></</span><span class="n">dependency</span><span class="o">></span>
<span class="o"></</span><span class="n">dependencies</span><span class="o">></span>
</code></pre></div><h2 id='job-data'>Job Data</h2>
<p>In order to store relevant data that your job can access when it runs, you need to create a serializable representation of that data in JSON.
The maximum data size is 512 megabytes.</p>
<blockquote>
<p>Create your own job data:</p>
</blockquote>
<div class="highlight"><pre class="highlight java tab-java"><code><span class="kn">import</span> <span class="nn">com.fasterxml.jackson.annotation.JsonCreator</span><span class="o">;</span>
<span class="kn">import</span> <span class="nn">com.fasterxml.jackson.annotation.JsonProperty</span><span class="o">;</span>
<span class="kd">public</span> <span class="kd">class</span> <span class="nc">TestJobData</span> <span class="o">{</span>
<span class="kd">private</span> <span class="kd">final</span> <span class="nc">String</span> <span class="n">username</span><span class="o">;</span>
<span class="nd">@JsonCreator</span>
<span class="kd">public</span> <span class="nf">TestJobData</span><span class="o">(</span><span class="nd">@JsonProperty</span><span class="o">(</span><span class="s">"username"</span><span class="o">)</span> <span class="nc">String</span> <span class="n">username</span><span class="o">)</span> <span class="o">{</span>
<span class="k">this</span><span class="o">.</span><span class="na">username</span> <span class="o">=</span> <span class="n">username</span><span class="o">;</span>
<span class="o">}</span>
<span class="kd">public</span> <span class="nc">String</span> <span class="nf">getUsername</span><span class="o">()</span> <span class="o">{</span>
<span class="k">return</span> <span class="n">username</span><span class="o">;</span>
<span class="o">}</span>
<span class="o">}</span>
</code></pre></div><h2 id='jobs'>Jobs</h2>
<p>A job is a simple interface that has a <code>run</code> method. When job data is pulled from a queue, a job instance is created and the <code>run</code> method is invoked with the data as a parameter.</p>
<blockquote>
<p>Create a job:</p>
</blockquote>
<div class="highlight"><pre class="highlight java tab-java"><code><span class="kn">import</span> <span class="nn">yerbie.job.Job</span><span class="o">;</span>
<span class="kn">import</span> <span class="nn">your.org.jobdata.TestJobData</span><span class="o">;</span>
<span class="kd">public</span> <span class="kd">class</span> <span class="nc">TestJob</span> <span class="kd">implements</span> <span class="nc">Job</span><span class="o"><</span><span class="nc">TestJobData</span><span class="o">></span> <span class="o">{</span>
<span class="nd">@Override</span>
<span class="kd">public</span> <span class="kt">void</span> <span class="nf">run</span><span class="o">(</span><span class="nc">TestJobData</span> <span class="n">testJobData</span><span class="o">)</span> <span class="o">{</span>
<span class="nc">System</span><span class="o">.</span><span class="na">out</span><span class="o">.</span><span class="na">println</span><span class="o">(</span><span class="s">"Hello "</span> <span class="o">+</span> <span class="n">testJobData</span><span class="o">.</span><span class="na">getUsername</span><span class="o">());</span>
<span class="o">}</span>
<span class="o">}</span>
</code></pre></div><h2 id='client-initialization'>Client Initialization</h2>
<p>By default, a Yerbie server listens for requests on port <code>5865</code>.</p>
<blockquote>
<p>To initialize a client:</p>
</blockquote>
<div class="highlight"><pre class="highlight java tab-java"><code><span class="kn">import</span> <span class="nn">yerbie.client.ClientProvider</span><span class="o">;</span>
<span class="kn">import</span> <span class="nn">yerbie.client.YerbieClient</span><span class="o">;</span>
<span class="nc">ClientProvider</span> <span class="n">clientProvider</span> <span class="o">=</span>
<span class="k">new</span> <span class="nf">ClientProvider</span><span class="o">(</span>
<span class="s">"localhost"</span><span class="o">,</span> <span class="mi">5865</span><span class="o">);</span>
<span class="c1">// The client takes in an ObjectMapper to perform serialization and deserialization of job data.</span>
<span class="nc">YerbieClient</span> <span class="n">yerbieClient</span> <span class="o">=</span> <span class="n">clientProvider</span><span class="o">.</span><span class="na">initializeClient</span><span class="o">(</span><span class="k">new</span> <span class="nc">ObjectMapper</span><span class="o">());</span>
</code></pre></div><h2 id='scheduling-jobs'>Scheduling Jobs</h2>
<p>At its simplest, Yerbie takes a delay in seconds, a queue name, and an instance of a job data.</p>
<p>The example tells Yerbie to make <code>TestJobData</code> available on <code>high_priority_queue</code> in 10 seconds.</p>
<p>Yerbie can easily handle delays of days or even weeks, but be cognizant that any changes to <code>TestJobData</code> will need to support old versions of the data.</p>
<p>Yerbie supports retrying on failure, and using this method will use the default retry mechanism of 30 seconds in between retries, with a total of 4 retries. This means that the job can run at most 5 times (the first run does not count as a retry), before no longer running.</p>
<blockquote>
<p>To schedule a job in 10 seconds to queue high_priority_queue:</p>
</blockquote>
<div class="highlight"><pre class="highlight java tab-java"><code><span class="kn">import</span> <span class="nn">your.org.jobdata.TestJobData</span><span class="o">;</span>
<span class="kn">import</span> <span class="nn">yerbie.serde.JSONJobData</span><span class="o">;</span>
<span class="n">yerbieClient</span><span class="o">.</span><span class="na">scheduleJob</span><span class="o">(</span><span class="nc">Duration</span><span class="o">.</span><span class="na">ofSeconds</span><span class="o">(</span><span class="mi">10</span><span class="o">),</span> <span class="s">"high_priority_queue"</span><span class="o">,</span> <span class="k">new</span> <span class="nc">TestJobData</span><span class="o">(</span><span class="s">"naota_nandaba"</span><span class="o">));</span>
</code></pre></div><h2 id='deleting-jobs'>Deleting Jobs</h2>
<p>To delete a job that is going to be executed, Yerbie allows you to delete a job via its job token. A job that is already enqueued into a queue cannot be deleted.
The client returns <code>true</code> if succesful, or <code>false</code> if it can't find the job (or it has already been enqueued).</p>
<blockquote>
<p>To delete a job with token <code>aa555552-c21c-4d0a-a7a0-713f2b02b169</code>:</p>
</blockquote>
<div class="highlight"><pre class="highlight java tab-java"><code><span class="kt">boolean</span> <span class="n">result</span> <span class="o">=</span> <span class="n">yerbieClient</span><span class="o">.</span><span class="na">deleteJob</span><span class="o">(</span><span class="s">"a555552-c21c-4d0a-a7a0-713f2b02b169"</span><span class="o">);</span>
</code></pre></div><h2 id='running-workers'>Running Workers</h2>
<p>This tells the library to start polling Yerbie for available work.</p>
<p>If you've been following along, with our test job data and job implementation, this job will print <code>Hello naota_nandaba</code> to the system output.</p>
<blockquote>
<p>To run a worker:</p>
</blockquote>
<div class="highlight"><pre class="highlight java tab-java"><code><span class="kn">import</span> <span class="nn">yerbie.client.JobRepositoryBuilder</span><span class="o">;</span>
<span class="kn">import</span> <span class="nn">yerbie.client.YerbieConsumer</span><span class="o">;</span>
<span class="kn">import</span> <span class="nn">yerbie.client.ClientProvider</span><span class="o">;</span>
<span class="kn">import</span> <span class="nn">your.org.jobdata.TestJobData</span><span class="o">;</span>
<span class="kn">import</span> <span class="nn">your.org.job.TestJob</span><span class="o">;</span>
<span class="nc">JobRepositoryBuilder</span> <span class="n">jobRepositoryBuilder</span> <span class="o">=</span> <span class="k">new</span> <span class="nc">JobRepositoryBuilder</span><span class="o">();</span>
<span class="n">jobRepositoryBuilder</span><span class="o">.</span><span class="na">withJobData</span><span class="o">(</span><span class="nc">TestJobData</span><span class="o">.</span><span class="na">class</span><span class="o">,</span> <span class="nl">TestJob:</span><span class="o">:</span><span class="k">new</span><span class="o">);</span>
<span class="nc">ClientProvider</span> <span class="n">clientProvider</span> <span class="o">=</span>
<span class="k">new</span> <span class="nf">ClientProvider</span><span class="o">(</span>
<span class="s">"localhost"</span><span class="o">,</span> <span class="mi">5865</span><span class="o">);</span>
<span class="nc">YerbieConsumer</span> <span class="n">yerbieConsumer</span> <span class="o">=</span>
<span class="n">clientProvider</span><span class="o">.</span><span class="na">initializeYerbieConsumer</span><span class="o">(</span><span class="s">"high_priority_queue"</span><span class="o">,</span> <span class="n">jobRepositoryBuilder</span><span class="o">.</span><span class="na">build</span><span class="o">());</span>
<span class="n">yerbieConsumer</span><span class="o">.</span><span class="na">start</span><span class="o">();</span>
</code></pre></div>
<blockquote>
<p>Your worker will now poll on the <code>high_priority_queue</code>. When it receives a <code>TestJobData</code>, it creates a new instance of <code>TestJob</code> and will invoke the <code>run</code> function with the job data.</p>
</blockquote>
<h1 id='retrying'>Retrying</h1>
<p>To initiate a job, the client library requests a job from a specific queue. Once popped, the library has 10 seconds to send an ack to Yerbie to acknowledge that it successfully ran the job. In the case where it doesn't run the job successfully, Yerbie will make the job available again.</p>
<p>In the case where an exception is thrown, the client library will re-queue the job according to the job's retry policy.</p>
<p>If you don't specify a retry policy when creating a job, Yerbie uses the default of a fixed interval 30 second retry policy with 4 total retries. This means that the job will run unsuccessfully at most 5 times (since the first run is not a retry).</p>
<h2 id='fixed-interval-retry-policy'>Fixed Interval Retry Policy</h2>
<p>This retry policy will make the job available on the queue in 30 seconds, and will retry 4 times, each waiting 30 seconds after the initial run if the job is still unsuccessful.</p>
<div class="highlight"><pre class="highlight java tab-java"><code><span class="kn">import</span> <span class="nn">yerbie.job.FixedRetryPolicy</span><span class="o">;</span>
<span class="kt">long</span> <span class="n">initialDelaySeconds</span> <span class="o">=</span> <span class="mi">30</span><span class="o">;</span>
<span class="kt">int</span> <span class="n">totalRetries</span> <span class="o">=</span> <span class="mi">4</span><span class="o">;</span>
<span class="n">yerbieClient</span><span class="o">.</span><span class="na">scheduleJob</span><span class="o">(</span><span class="nc">Duration</span><span class="o">.</span><span class="na">ofSeconds</span><span class="o">(</span><span class="mi">10</span><span class="o">),</span> <span class="s">"high_priority_queue"</span><span class="o">,</span> <span class="k">new</span> <span class="nc">TestJobData</span><span class="o">(</span><span class="s">"naota_nandaba"</span><span class="o">),</span> <span class="k">new</span> <span class="nc">FixedRetryPolicy</span><span class="o">(</span><span class="n">initialDelaySeconds</span><span class="o">,</span> <span class="n">totalRetries</span><span class="o">));</span>
</code></pre></div><h2 id='exponential-retry-policy'>Exponential Retry Policy</h2>
<p>This retry policy will make the job available after an exception in 5 seconds, then 25, then 125, then 625 before stopping.</p>
<div class="highlight"><pre class="highlight java tab-java"><code><span class="kn">import</span> <span class="nn">yerbie.job.ExponentialRetryPolicy</span><span class="o">;</span>
<span class="kt">long</span> <span class="n">initialDelaySeconds</span> <span class="o">=</span> <span class="mi">5</span><span class="o">;</span>
<span class="kt">int</span> <span class="n">totalRetries</span> <span class="o">=</span> <span class="mi">4</span><span class="o">;</span>
<span class="n">yerbieClient</span><span class="o">.</span><span class="na">scheduleJob</span><span class="o">(</span><span class="nc">Duration</span><span class="o">.</span><span class="na">ofSeconds</span><span class="o">(</span><span class="mi">10</span><span class="o">),</span> <span class="s">"high_priority_queue"</span><span class="o">,</span> <span class="k">new</span> <span class="nc">TestJobData</span><span class="o">(</span><span class="s">"naota_nandaba"</span><span class="o">),</span> <span class="k">new</span> <span class="nc">ExponentialRetryPolicy</span><span class="o">(</span><span class="n">initialDelaySeconds</span><span class="o">,</span> <span class="n">totalRetries</span><span class="o">));</span>
</code></pre></div>
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