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<div class="section" id="messages">
<h1>Messages<a class="headerlink" href="#messages" title="Permalink to this headline">¶</a></h1>
<div class="section" id="setup">
<h2>Setup<a class="headerlink" href="#setup" title="Permalink to this headline">¶</a></h2>
<p>In order to work with messages, you must first retrieve a queue by its name:</p>
<div class="highlight-php"><div class="highlight"><pre><span class="nv">$queue</span> <span class="o">=</span> <span class="nv">$service</span><span class="o">-></span><span class="na">getQueue</span><span class="p">(</span><span class="s1">'{queueName}'</span><span class="p">);</span>
</pre></div>
</div>
</div>
<div class="section" id="post-new-message">
<h2>Post new message<a class="headerlink" href="#post-new-message" title="Permalink to this headline">¶</a></h2>
<p>This operation posts the specified message or messages. You can submit
up to 10 messages in a single request.</p>
<p>When posting new messages, you specify only the <tt class="docutils literal"><span class="pre">body</span></tt> and <tt class="docutils literal"><span class="pre">ttl</span></tt> for
the message. The API will insert metadata, such as ID and age.</p>
<p>How you pass through the array structure depends on whether you are
executing multiple or single posts, but the keys are the
same:</p>
<ul class="simple">
<li>The <tt class="docutils literal"><span class="pre">body</span></tt> attribute specifies an arbitrary document that constitutes
the body of the message being sent. The size of this body is limited to
256 KB, excluding whitespace.</li>
<li>The <tt class="docutils literal"><span class="pre">ttl</span></tt> attribute specifies how long the server waits before marking
the message as expired and removing it from the queue. The value of ttl
must be between 60 and 1209600 seconds (14 days). Note that the server
might not actually delete the message until its age has reached up to
(ttl + 60) seconds, to allow for flexibility in storage implementations.</li>
</ul>
<div class="section" id="posting-a-single-message">
<h3>Posting a single message<a class="headerlink" href="#posting-a-single-message" title="Permalink to this headline">¶</a></h3>
<div class="highlight-php"><div class="highlight"><pre><span class="k">use</span> <span class="nx">OpenCloud\Common\Constants\Datetime</span><span class="p">;</span>
<span class="nv">$queue</span><span class="o">-></span><span class="na">createMessage</span><span class="p">(</span><span class="k">array</span><span class="p">(</span>
<span class="s1">'body'</span> <span class="o">=></span> <span class="p">(</span><span class="nx">object</span><span class="p">)</span> <span class="k">array</span><span class="p">(</span>
<span class="s1">'event'</span> <span class="o">=></span> <span class="s1">'BackupStarted'</span><span class="p">,</span>
<span class="s1">'deadline'</span> <span class="o">=></span> <span class="s1">'26.12.2013'</span><span class="p">,</span>
<span class="p">),</span>
<span class="s1">'ttl'</span> <span class="o">=></span> <span class="mi">2</span> <span class="o">*</span> <span class="nx">Datetime</span><span class="o">::</span><span class="na">DAY</span>
<span class="p">));</span>
</pre></div>
</div>
<p><a class="reference external" href="https://raw.githubusercontent.com/rackspace/php-opencloud/master/samples/Queues/add-message.php">Get the executable PHP script for this example</a></p>
</div>
<div class="section" id="post-a-batch-of-messages">
<h3>Post a batch of messages<a class="headerlink" href="#post-a-batch-of-messages" title="Permalink to this headline">¶</a></h3>
<p>Please note that the list of messages will be truncated at 10. For more,
please execute another method call.</p>
<div class="highlight-php"><div class="highlight"><pre><span class="k">use</span> <span class="nx">OpenCloud\Common\Constants\Datetime</span><span class="p">;</span>
<span class="nv">$messages</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span>
<span class="k">array</span><span class="p">(</span>
<span class="s1">'body'</span> <span class="o">=></span> <span class="p">(</span><span class="nx">object</span><span class="p">)</span> <span class="k">array</span><span class="p">(</span>
<span class="s1">'play'</span> <span class="o">=></span> <span class="s1">'football'</span>
<span class="p">),</span>
<span class="s1">'ttl'</span> <span class="o">=></span> <span class="mi">2</span> <span class="o">*</span> <span class="nx">Datetime</span><span class="o">::</span><span class="na">DAY</span>
<span class="p">),</span>
<span class="k">array</span><span class="p">(</span>
<span class="s1">'body'</span> <span class="o">=></span> <span class="p">(</span><span class="nx">object</span><span class="p">)</span> <span class="k">array</span><span class="p">(</span>
<span class="s1">'play'</span> <span class="o">=></span> <span class="s1">'tennis'</span>
<span class="p">),</span>
<span class="s1">'ttl'</span> <span class="o">=></span> <span class="mi">50</span> <span class="o">*</span> <span class="nx">Datetime</span><span class="o">::</span><span class="na">HOUR</span>
<span class="p">)</span>
<span class="p">);</span>
<span class="nv">$queue</span><span class="o">-></span><span class="na">createMessages</span><span class="p">(</span><span class="nv">$messages</span><span class="p">);</span>
</pre></div>
</div>
</div>
</div>
<div class="section" id="get-messages">
<h2>Get messages<a class="headerlink" href="#get-messages" title="Permalink to this headline">¶</a></h2>
<p>This operation gets the message or messages in the specified queue.</p>
<p>Message IDs and markers are opaque strings. Clients should make no
assumptions about their format or length. Furthermore, clients should
assume that there is no relationship between markers and message IDs
(that is, one cannot be derived from the other). This allows for a wide
variety of storage driver implementations.</p>
<p>Results are ordered by age, oldest message first.</p>
<div class="section" id="parameters">
<h3>Parameters<a class="headerlink" href="#parameters" title="Permalink to this headline">¶</a></h3>
<p>When retrieving messages, you can filter using these options:</p>
<div class="highlight-php"><div class="highlight"><pre><span class="nv">$messages</span> <span class="o">=</span> <span class="nv">$queue</span><span class="o">-></span><span class="na">listMessages</span><span class="p">(</span><span class="k">array</span><span class="p">(</span>
<span class="s1">'marker'</span> <span class="o">=></span> <span class="s1">'51db6f78c508f17ddc924357'</span><span class="p">,</span>
<span class="s1">'limit'</span> <span class="o">=></span> <span class="mi">20</span><span class="p">,</span>
<span class="s1">'echo'</span> <span class="o">=></span> <span class="k">true</span>
<span class="p">));</span>
<span class="k">foreach</span> <span class="p">(</span><span class="nv">$messages</span> <span class="k">as</span> <span class="nv">$message</span><span class="p">)</span> <span class="p">{</span>
<span class="k">echo</span> <span class="nv">$message</span><span class="o">-></span><span class="na">getId</span><span class="p">()</span> <span class="o">.</span> <span class="nx">PHP_EOL</span><span class="p">;</span>
<span class="p">}</span>
</pre></div>
</div>
</div>
</div>
<div class="section" id="get-a-set-of-messages-by-id">
<h2>Get a set of messages by ID<a class="headerlink" href="#get-a-set-of-messages-by-id" title="Permalink to this headline">¶</a></h2>
<p>This operation provides a more efficient way to query multiple messages
compared to using a series of individual GET. Note that the list of IDs
cannot exceed 20. If a malformed ID or a nonexistent message ID is
provided, it is ignored, and the remaining messages are returned.</p>
<div class="section" id="id1">
<h3>Parameters<a class="headerlink" href="#id1" title="Permalink to this headline">¶</a></h3>
<div class="highlight-php"><div class="highlight"><pre><span class="nv">$ids</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span><span class="s1">'id_1'</span><span class="p">,</span> <span class="s1">'id_2'</span><span class="p">);</span>
<span class="nv">$messages</span> <span class="o">=</span> <span class="nv">$queue</span><span class="o">-></span><span class="na">listMessages</span><span class="p">(</span><span class="k">array</span><span class="p">(</span><span class="s1">'ids'</span> <span class="o">=></span> <span class="nv">$ids</span><span class="p">));</span>
<span class="k">foreach</span> <span class="p">(</span><span class="nv">$messages</span> <span class="k">as</span> <span class="nv">$message</span><span class="p">)</span> <span class="p">{</span>
<span class="k">echo</span> <span class="nv">$message</span><span class="o">-></span><span class="na">getId</span><span class="p">()</span> <span class="o">.</span> <span class="nx">PHP_EOL</span><span class="p">;</span>
<span class="p">}</span>
</pre></div>
</div>
</div>
</div>
<div class="section" id="delete-a-set-of-messages-by-id">
<h2>Delete a set of messages by ID<a class="headerlink" href="#delete-a-set-of-messages-by-id" title="Permalink to this headline">¶</a></h2>
<p>This operation immediately deletes the specified messages. If any of the
message IDs are malformed or non-existent, they are ignored. The
remaining valid messages IDs are deleted.</p>
<div class="highlight-php"><div class="highlight"><pre><span class="nv">$ids</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span><span class="s1">'id_1'</span><span class="p">,</span> <span class="s1">'id_2'</span><span class="p">);</span>
<span class="nv">$response</span> <span class="o">=</span> <span class="nv">$queue</span><span class="o">-></span><span class="na">deleteMessages</span><span class="p">(</span><span class="nv">$ids</span><span class="p">);</span>
</pre></div>
</div>
</div>
<div class="section" id="get-a-specific-message">
<h2>Get a specific message<a class="headerlink" href="#get-a-specific-message" title="Permalink to this headline">¶</a></h2>
<p>This operation gets the specified message from the specified queue.</p>
<div class="highlight-php"><div class="highlight"><pre><span class="sd">/** @var $message OpenCloud\Queues\Message */</span>
<span class="nv">$message</span> <span class="o">=</span> <span class="nv">$queue</span><span class="o">-></span><span class="na">getMessage</span><span class="p">(</span><span class="s1">'{messageId}'</span><span class="p">);</span>
</pre></div>
</div>
<p>Once you have access to the <tt class="docutils literal"><span class="pre">Message</span></tt> object, you access its attributes:</p>
<table border="1" class="docutils">
<colgroup>
<col width="8%" />
<col width="10%" />
<col width="82%" />
</colgroup>
<thead valign="bottom">
<tr class="row-odd"><th class="head">attribute</th>
<th class="head">method</th>
<th class="head">description</th>
</tr>
</thead>
<tbody valign="top">
<tr class="row-even"><td>href</td>
<td><tt class="docutils literal"><span class="pre">getHref</span></tt></td>
<td>An opaque relative URI that the client can use to uniquely identify a message resource and interact with it.</td>
</tr>
<tr class="row-odd"><td>ttl</td>
<td><tt class="docutils literal"><span class="pre">getTtl</span></tt></td>
<td>The TTL that was set on the message when it was posted. The message expires after (ttl - age) seconds.</td>
</tr>
<tr class="row-even"><td>age</td>
<td><tt class="docutils literal"><span class="pre">getAge</span></tt></td>
<td>The number of seconds relative to the server’s clock.</td>
</tr>
<tr class="row-odd"><td>body</td>
<td><tt class="docutils literal"><span class="pre">getBody</span></tt></td>
<td>The arbitrary document that was submitted with the original request to post the message.</td>
</tr>
</tbody>
</table>
</div>
<div class="section" id="delete-message">
<h2>Delete message<a class="headerlink" href="#delete-message" title="Permalink to this headline">¶</a></h2>
<div class="highlight-php"><div class="highlight"><pre><span class="nv">$message</span><span class="o">-></span><span class="na">delete</span><span class="p">();</span>
</pre></div>
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