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Class: Concurrent::Promises::Channel
— Concurrent
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<span class="title">Channel</span>
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<div id="content"><h1>Class: Concurrent::Promises::Channel
</h1>
<dl class="box">
<dt class="r1">Inherits:</dt>
<dd class="r1">
<span class="inheritName"><span class='object_link'><a href="../Synchronization/Object.html" title="Concurrent::Synchronization::Object (class)">Synchronization::Object</a></span></span>
<ul class="fullTree">
<li>Object</li>
<li class="next"><span class='object_link'><a href="../Synchronization/Object.html" title="Concurrent::Synchronization::Object (class)">Synchronization::Object</a></span></li>
<li class="next">Concurrent::Promises::Channel</li>
</ul>
<a href="#" class="inheritanceTree">show all</a>
</dd>
<dt class="r2 last">Defined in:</dt>
<dd class="r2 last">lib/concurrent/edge/promises.rb</dd>
</dl>
<div class="clear"></div>
<h2>Constant Summary</h2>
<dl class="constants">
<dt id="UNLIMITED-constant" class="">UNLIMITED =
<div class="docstring">
<div class="discussion">
<p>Default size of the Channel, makes it accept unlimited number of messages.</p>
</div>
</div>
<div class="tags">
</div>
</dt>
<dd><pre class="code"><span class='const'>Object</span><span class='period'>.</span><span class='id identifier rubyid_new'>new</span></pre></dd>
</dl>
<h2>
Instance Method Summary
<small>(<a href="#" class="summary_toggle">collapse</a>)</small>
</h2>
<ul class="summary">
<li class="public ">
<span class="summary_signature">
<a href="#initialize-instance_method" title="#initialize (instance method)">- (Channel) <strong>initialize</strong>(size = UNLIMITED) </a>
</span>
<span class="note title constructor">constructor</span>
<span class="summary_desc"><div class='inline'><p>A channel to pass messages between promises.</p>
</div></span>
</li>
<li class="public ">
<span class="summary_signature">
<a href="#pop-instance_method" title="#pop (instance method)">- (Future) <strong>pop</strong>(probe = Concurrent::Promises.resolvable_future) </a>
</span>
<span class="summary_desc"><div class='inline'><p>Returns a future witch will become fulfilled with a value from the channel when one is available.</p>
</div></span>
</li>
<li class="public ">
<span class="summary_signature">
<a href="#push-instance_method" title="#push (instance method)">- (Future) <strong>push</strong>(message) </a>
</span>
<span class="summary_desc"><div class='inline'><p>Returns future which will fulfill when the message is added to the channel.</p>
</div></span>
</li>
<li class="public ">
<span class="summary_signature">
<a href="#to_s-instance_method" title="#to_s (instance method)">- (String) <strong>to_s</strong> </a>
(also: #inspect)
</span>
<span class="summary_desc"><div class='inline'><p>Short string representation.</p>
</div></span>
</li>
</ul>
<div id="constructor_details" class="method_details_list">
<h2>Constructor Details</h2>
<div class="method_details first">
<h3 class="signature first" id="initialize-instance_method">
- (<tt><span class='object_link'><a href="" title="Concurrent::Promises::Channel (class)">Channel</a></span></tt>) <strong>initialize</strong>(size = UNLIMITED)
</h3><div class="docstring">
<div class="discussion">
<p>A channel to pass messages between promises. The size is limited to support back pressure.</p>
</div>
</div>
<div class="tags">
<p class="tag_title">Parameters:</p>
<ul class="param">
<li>
<span class='name'>size</span>
<span class='type'>(<tt>Integer</tt>, <tt><span class='object_link'><a href="#UNLIMITED-constant" title="Concurrent::Promises::Channel::UNLIMITED (constant)">UNLIMITED</a></span></tt>)</span>
<em class="default">(defaults to: <tt>UNLIMITED</tt>)</em>
—
<div class='inline'><p>the maximum number of messages stored in the channel.</p>
</div>
</li>
</ul>
</div><table class="source_code">
<tr>
<td>
<pre class="lines">
2005
2006
2007
2008
2009
2010
2011
2012
2013</pre>
</td>
<td>
<pre class="code"><span class="info file"># File 'lib/concurrent/edge/promises.rb', line 2005</span>
<span class='kw'>def</span> <span class='id identifier rubyid_initialize'>initialize</span><span class='lparen'>(</span><span class='id identifier rubyid_size'>size</span> <span class='op'>=</span> <span class='const'>UNLIMITED</span><span class='rparen'>)</span>
<span class='kw'>super</span><span class='lparen'>(</span><span class='rparen'>)</span>
<span class='ivar'>@Size</span> <span class='op'>=</span> <span class='id identifier rubyid_size'>size</span>
<span class='comment'># TODO (pitr-ch 26-Dec-2016): replace with lock-free implementation
</span> <span class='ivar'>@Mutex</span> <span class='op'>=</span> <span class='const'>Mutex</span><span class='period'>.</span><span class='id identifier rubyid_new'>new</span>
<span class='ivar'>@Probes</span> <span class='op'>=</span> <span class='lbracket'>[</span><span class='rbracket'>]</span>
<span class='ivar'>@Messages</span> <span class='op'>=</span> <span class='lbracket'>[</span><span class='rbracket'>]</span>
<span class='ivar'>@PendingPush</span> <span class='op'>=</span> <span class='lbracket'>[</span><span class='rbracket'>]</span>
<span class='kw'>end</span></pre>
</td>
</tr>
</table>
</div>
</div>
<div id="instance_method_details" class="method_details_list">
<h2>Instance Method Details</h2>
<div class="method_details first">
<h3 class="signature first" id="pop-instance_method">
- (<tt><span class='object_link'><a href="Future.html" title="Concurrent::Promises::Future (class)">Future</a></span></tt>) <strong>pop</strong>(probe = Concurrent::Promises.resolvable_future)
</h3><div class="docstring">
<div class="discussion">
<p>Returns a future witch will become fulfilled with a value from the channel when one is available.</p>
</div>
</div>
<div class="tags">
<p class="tag_title">Parameters:</p>
<ul class="param">
<li>
<span class='name'>probe</span>
<span class='type'>(<tt><span class='object_link'><a href="ResolvableFuture.html" title="Concurrent::Promises::ResolvableFuture (class)">ResolvableFuture</a></span></tt>)</span>
<em class="default">(defaults to: <tt>Concurrent::Promises.resolvable_future</tt>)</em>
—
<div class='inline'><p>the future which will be fulfilled with a channel value</p>
</div>
</li>
</ul>
<p class="tag_title">Returns:</p>
<ul class="return">
<li>
<span class='type'>(<tt><span class='object_link'><a href="Future.html" title="Concurrent::Promises::Future (class)">Future</a></span></tt>)</span>
—
<div class='inline'><p>the probe, its value will be the message when available.</p>
</div>
</li>
</ul>
</div><table class="source_code">
<tr>
<td>
<pre class="lines">
2044
2045
2046
2047</pre>
</td>
<td>
<pre class="code"><span class="info file"># File 'lib/concurrent/edge/promises.rb', line 2044</span>
<span class='kw'>def</span> <span class='id identifier rubyid_pop'>pop</span><span class='lparen'>(</span><span class='id identifier rubyid_probe'>probe</span> <span class='op'>=</span> <span class='const'>Concurrent</span><span class='op'>::</span><span class='const'>Promises</span><span class='period'>.</span><span class='id identifier rubyid_resolvable_future'>resolvable_future</span><span class='rparen'>)</span>
<span class='comment'># TODO (pitr-ch 26-Dec-2016): improve performance
</span> <span class='id identifier rubyid_pop_for_select'>pop_for_select</span><span class='lparen'>(</span><span class='id identifier rubyid_probe'>probe</span><span class='rparen'>)</span><span class='period'>.</span><span class='id identifier rubyid_then'>then</span><span class='lparen'>(</span><span class='op'>&</span><span class='symbol'>:last</span><span class='rparen'>)</span>
<span class='kw'>end</span></pre>
</td>
</tr>
</table>
</div>
<div class="method_details ">
<h3 class="signature " id="push-instance_method">
- (<tt><span class='object_link'><a href="Future.html" title="Concurrent::Promises::Future (class)">Future</a></span></tt>) <strong>push</strong>(message)
</h3><div class="docstring">
<div class="discussion">
<p>Returns future which will fulfill when the message is added to the channel. Its value is the message.</p>
</div>
</div>
<div class="tags">
<p class="tag_title">Parameters:</p>
<ul class="param">
<li>
<span class='name'>message</span>
<span class='type'>(<tt>Object</tt>)</span>
</li>
</ul>
<p class="tag_title">Returns:</p>
<ul class="return">
<li>
<span class='type'>(<tt><span class='object_link'><a href="Future.html" title="Concurrent::Promises::Future (class)">Future</a></span></tt>)</span>
</li>
</ul>
</div><table class="source_code">
<tr>
<td>
<pre class="lines">
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039</pre>
</td>
<td>
<pre class="code"><span class="info file"># File 'lib/concurrent/edge/promises.rb', line 2019</span>
<span class='kw'>def</span> <span class='id identifier rubyid_push'>push</span><span class='lparen'>(</span><span class='id identifier rubyid_message'>message</span><span class='rparen'>)</span>
<span class='ivar'>@Mutex</span><span class='period'>.</span><span class='id identifier rubyid_synchronize'>synchronize</span> <span class='kw'>do</span>
<span class='kw'>while</span> <span class='kw'>true</span>
<span class='kw'>if</span> <span class='ivar'>@Probes</span><span class='period'>.</span><span class='id identifier rubyid_empty?'>empty?</span>
<span class='kw'>if</span> <span class='ivar'>@Size</span> <span class='op'>></span> <span class='ivar'>@Messages</span><span class='period'>.</span><span class='id identifier rubyid_size'>size</span>
<span class='ivar'>@Messages</span><span class='period'>.</span><span class='id identifier rubyid_push'>push</span> <span class='id identifier rubyid_message'>message</span>
<span class='kw'>return</span> <span class='const'>Promises</span><span class='period'>.</span><span class='id identifier rubyid_fulfilled_future'>fulfilled_future</span> <span class='id identifier rubyid_message'>message</span>
<span class='kw'>else</span>
<span class='id identifier rubyid_pushed'>pushed</span> <span class='op'>=</span> <span class='const'>Promises</span><span class='period'>.</span><span class='id identifier rubyid_resolvable_future'>resolvable_future</span>
<span class='ivar'>@PendingPush</span><span class='period'>.</span><span class='id identifier rubyid_push'>push</span> <span class='lbracket'>[</span><span class='id identifier rubyid_message'>message</span><span class='comma'>,</span> <span class='id identifier rubyid_pushed'>pushed</span><span class='rbracket'>]</span>
<span class='kw'>return</span> <span class='id identifier rubyid_pushed'>pushed</span><span class='period'>.</span><span class='id identifier rubyid_with_hidden_resolvable'>with_hidden_resolvable</span>
<span class='kw'>end</span>
<span class='kw'>else</span>
<span class='id identifier rubyid_probe'>probe</span> <span class='op'>=</span> <span class='ivar'>@Probes</span><span class='period'>.</span><span class='id identifier rubyid_shift'>shift</span>
<span class='kw'>if</span> <span class='id identifier rubyid_probe'>probe</span><span class='period'>.</span><span class='id identifier rubyid_fulfill'>fulfill</span> <span class='lbracket'>[</span><span class='kw'>self</span><span class='comma'>,</span> <span class='id identifier rubyid_message'>message</span><span class='rbracket'>]</span><span class='comma'>,</span> <span class='kw'>false</span>
<span class='kw'>return</span> <span class='const'>Promises</span><span class='period'>.</span><span class='id identifier rubyid_fulfilled_future'>fulfilled_future</span><span class='lparen'>(</span><span class='id identifier rubyid_message'>message</span><span class='rparen'>)</span>
<span class='kw'>end</span>
<span class='kw'>end</span>
<span class='kw'>end</span>
<span class='kw'>end</span>
<span class='kw'>end</span></pre>
</td>
</tr>
</table>
</div>
<div class="method_details ">
<h3 class="signature " id="to_s-instance_method">
- (<tt>String</tt>) <strong>to_s</strong>
<span class="aliases">Also known as:
<span class="names"><span id='inspect-instance_method'>inspect</span></span>
</span>
</h3><div class="docstring">
<div class="discussion">
<p>Returns Short string representation.</p>
</div>
</div>
<div class="tags">
<p class="tag_title">Returns:</p>
<ul class="return">
<li>
<span class='type'>(<tt>String</tt>)</span>
—
<div class='inline'><p>Short string representation.</p>
</div>
</li>
</ul>
</div><table class="source_code">
<tr>
<td>
<pre class="lines">
2069
2070
2071</pre>
</td>
<td>
<pre class="code"><span class="info file"># File 'lib/concurrent/edge/promises.rb', line 2069</span>
<span class='kw'>def</span> <span class='id identifier rubyid_to_s'>to_s</span>
<span class='id identifier rubyid_format'>format</span> <span class='tstring'><span class='tstring_beg'>'</span><span class='tstring_content'><#%s:0x%x size:%s></span><span class='tstring_end'>'</span></span><span class='comma'>,</span> <span class='kw'>self</span><span class='period'>.</span><span class='id identifier rubyid_class'>class</span><span class='comma'>,</span> <span class='id identifier rubyid_object_id'>object_id</span> <span class='op'><<</span> <span class='int'>1</span><span class='comma'>,</span> <span class='ivar'>@Size</span>
<span class='kw'>end</span></pre>
</td>
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