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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>
Class: Concurrent::Channel::Buffer::Buffered
— Concurrent Ruby
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<span class="title">Buffered</span>
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<div id="content"><h1>Class: Concurrent::Channel::Buffer::Buffered
</h1>
<div class="box_info">
<dl>
<dt>Inherits:</dt>
<dd>
<span class="inheritName"><span class='object_link'><a href="Base.html" title="Concurrent::Channel::Buffer::Base (class)">Base</a></span></span>
<ul class="fullTree">
<li>Object</li>
<li class="next"><span class='object_link'>Synchronization::LockableObject</span></li>
<li class="next"><span class='object_link'><a href="Base.html" title="Concurrent::Channel::Buffer::Base (class)">Base</a></span></li>
<li class="next">Concurrent::Channel::Buffer::Buffered</li>
</ul>
<a href="#" class="inheritanceTree">show all</a>
</dd>
</dl>
<dl>
<dt>Defined in:</dt>
<dd>lib-edge/concurrent/channel/buffer/buffered.rb</dd>
</dl>
</div>
<h2>Overview</h2><div class="docstring">
<div class="discussion">
<p>A buffer with a fixed internal capacity. Items can be put onto the
buffer without blocking until the internal capacity is reached. Once
the buffer is at capacity, subsequent calls to <span class='object_link'><a href="#put-instance_method" title="Concurrent::Channel::Buffer::Buffered#put (method)">#put</a></span> will block until
an item is removed from the buffer, creating spare capacity.</p>
</div>
</div>
<div class="tags">
</div><div id="subclasses">
<h2>Direct Known Subclasses</h2>
<p class="children"><span class='object_link'><a href="Dropping.html" title="Concurrent::Channel::Buffer::Dropping (class)">Dropping</a></span>, <span class='object_link'><a href="Sliding.html" title="Concurrent::Channel::Buffer::Sliding (class)">Sliding</a></span></p>
</div>
<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="#next-instance_method" title="#next (instance method)">#<strong>next</strong> ⇒ Object, Boolean </a>
</span>
<span class="summary_desc"><div class='inline'><p>Take the next "item" from the buffer and also return a boolean indicating if "more" items can be taken.</p>
</div></span>
</li>
<li class="public ">
<span class="summary_signature">
<a href="#offer-instance_method" title="#offer (instance method)">#<strong>offer</strong>(item) ⇒ Boolean </a>
</span>
<span class="summary_desc"><div class='inline'><p>Put an item onto the buffer if possible.</p>
</div></span>
</li>
<li class="public ">
<span class="summary_signature">
<a href="#poll-instance_method" title="#poll (instance method)">#<strong>poll</strong> ⇒ Object </a>
</span>
<span class="summary_desc"><div class='inline'><p>Take the next item from the buffer if one is available else return immediately.</p>
</div></span>
</li>
<li class="public ">
<span class="summary_signature">
<a href="#put-instance_method" title="#put (instance method)">#<strong>put</strong>(item) ⇒ Boolean </a>
</span>
<span class="summary_desc"><div class='inline'><p>Put an item onto the buffer if possible.</p>
</div></span>
</li>
<li class="public ">
<span class="summary_signature">
<a href="#take-instance_method" title="#take (instance method)">#<strong>take</strong> ⇒ Object </a>
</span>
<span class="summary_desc"><div class='inline'><p>Take an item from the buffer if one is available.</p>
</div></span>
</li>
</ul>
<div id="constructor_details" class="method_details_list">
<h2>Constructor Details</h2>
<p class="notice">This class inherits a constructor from <span class='object_link'><a href="Base.html#initialize-instance_method" title="Concurrent::Channel::Buffer::Base#initialize (method)">Concurrent::Channel::Buffer::Base</a></span></p>
</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="next-instance_method">
#<strong>next</strong> ⇒ <tt>Object</tt>, <tt>Boolean</tt>
</h3><div class="docstring">
<div class="discussion">
<p>Take the next "item" from the buffer and also return a boolean
indicating if "more" items can be taken. Used for iterating
over a buffer until it is closed and empty.</p>
<p>If the buffer is open but no items remain the calling thread will
block until an item is available. The second of the two return
values, "more" (a boolean), will always be <code>true</code> when the buffer is
open. The "more" value will be <code>false</code> when the channel has been
closed and all values have already been received. When "more" is
false the returned item will be <code>Concurrent::NULL</code>.</p>
<p>Note that when multiple threads access the same channel a race
condition can occur when using this method. A call to <code>next</code> from
one thread may return <code>true</code> for the second return value, but
another thread may <code>take</code> the last value before the original
thread makes another call. Code which iterates over a channel
must be programmed to properly handle these race conditions.</p>
</div>
</div>
<div class="tags">
<p class="tag_title">Returns:</p>
<ul class="return">
<li>
<span class='type'>(<tt>Object</tt>, <tt>Boolean</tt>)</span>
—
<div class='inline'><p>the first return value will be the item
taken from the buffer and the second return value will be a
boolean indicating whether or not more items remain.</p>
</div>
</li>
</ul>
</div><table class="source_code">
<tr>
<td>
<pre class="lines">
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</td>
<td>
<pre class="code"><span class="info file"># File 'lib-edge/concurrent/channel/buffer/buffered.rb', line 56</span>
<span class='kw'>def</span> <span class='kw'>next</span>
<span class='id identifier rubyid_loop'>loop</span> <span class='kw'>do</span>
<span class='id identifier rubyid_synchronize'>synchronize</span> <span class='kw'>do</span>
<span class='kw'>if</span> <span class='id identifier rubyid_ns_closed?'>ns_closed?</span> <span class='op'>&&</span> <span class='id identifier rubyid_ns_empty?'>ns_empty?</span>
<span class='kw'>return</span> <span class='const'><span class='object_link'><a href="../../../Concurrent.html" title="Concurrent (module)">Concurrent</a></span></span><span class='op'>::</span><span class='const'>NULL</span><span class='comma'>,</span> <span class='kw'>false</span>
<span class='kw'>elsif</span> <span class='op'>!</span><span class='id identifier rubyid_ns_empty?'>ns_empty?</span>
<span class='id identifier rubyid_item'>item</span> <span class='op'>=</span> <span class='id identifier rubyid_buffer'>buffer</span><span class='period'>.</span><span class='id identifier rubyid_shift'>shift</span>
<span class='kw'>return</span> <span class='id identifier rubyid_item'>item</span><span class='comma'>,</span> <span class='kw'>true</span>
<span class='kw'>end</span>
<span class='kw'>end</span>
<span class='const'>Thread</span><span class='period'>.</span><span class='id identifier rubyid_pass'>pass</span>
<span class='kw'>end</span>
<span class='kw'>end</span></pre>
</td>
</tr>
</table>
</div>
<div class="method_details ">
<h3 class="signature " id="offer-instance_method">
#<strong>offer</strong>(item) ⇒ <tt>Boolean</tt>
</h3><div class="docstring">
<div class="discussion">
<p>Put an item onto the buffer if possible. If the buffer is open but
unable to add an item, probably due to being full, the method will
return immediately. Similarly, the method will return immediately
when the buffer is closed. A return value of <code>false</code> does not
necessarily indicate that the buffer is closed, just that the item
could not be added.</p>
<p>New items can be put onto the buffer until the number of items in
the buffer reaches the <span class='object_link'><a href="Base.html#size-instance_method" title="Concurrent::Channel::Buffer::Base#size (method)">Concurrent::Channel::Buffer::Base#size</a></span> value specified during
initialization.</p>
</div>
</div>
<div class="tags">
<p class="tag_title">Parameters:</p>
<ul class="param">
<li>
<span class='name'>item</span>
<span class='type'>(<tt>Object</tt>)</span>
—
<div class='inline'><p>the item/value to put onto the buffer.</p>
</div>
</li>
</ul>
<p class="tag_title">Returns:</p>
<ul class="return">
<li>
<span class='type'>(<tt>Boolean</tt>)</span>
—
<div class='inline'><p>true if the item was added to the buffer else
false (always false when closed).</p>
</div>
</li>
</ul>
</div><table class="source_code">
<tr>
<td>
<pre class="lines">
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</td>
<td>
<pre class="code"><span class="info file"># File 'lib-edge/concurrent/channel/buffer/buffered.rb', line 38</span>
<span class='kw'>def</span> <span class='id identifier rubyid_offer'>offer</span><span class='lparen'>(</span><span class='id identifier rubyid_item'>item</span><span class='rparen'>)</span>
<span class='id identifier rubyid_synchronize'>synchronize</span> <span class='kw'>do</span>
<span class='kw'>if</span> <span class='id identifier rubyid_ns_closed?'>ns_closed?</span> <span class='op'>||</span> <span class='id identifier rubyid_ns_full?'>ns_full?</span>
<span class='kw'>return</span> <span class='kw'>false</span>
<span class='kw'>else</span>
<span class='id identifier rubyid_ns_put_onto_buffer'>ns_put_onto_buffer</span><span class='lparen'>(</span><span class='id identifier rubyid_item'>item</span><span class='rparen'>)</span>
<span class='kw'>return</span> <span class='kw'>true</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="poll-instance_method">
#<strong>poll</strong> ⇒ <tt>Object</tt>
</h3><div class="docstring">
<div class="discussion">
<p>Take the next item from the buffer if one is available else return
immediately. Failing to return a value does not necessarily
indicate that the buffer is closed, just that it is empty.</p>
</div>
</div>
<div class="tags">
<p class="tag_title">Returns:</p>
<ul class="return">
<li>
<span class='type'>(<tt>Object</tt>)</span>
—
<div class='inline'><p>the next item from the buffer or <code>Concurrent::NULL</code> if
the buffer is empty.</p>
</div>
</li>
</ul>
</div><table class="source_code">
<tr>
<td>
<pre class="lines">
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79</pre>
</td>
<td>
<pre class="code"><span class="info file"># File 'lib-edge/concurrent/channel/buffer/buffered.rb', line 71</span>
<span class='kw'>def</span> <span class='id identifier rubyid_poll'>poll</span>
<span class='id identifier rubyid_synchronize'>synchronize</span> <span class='kw'>do</span>
<span class='kw'>if</span> <span class='id identifier rubyid_ns_empty?'>ns_empty?</span>
<span class='const'><span class='object_link'><a href="../../../Concurrent.html" title="Concurrent (module)">Concurrent</a></span></span><span class='op'>::</span><span class='const'>NULL</span>
<span class='kw'>else</span>
<span class='id identifier rubyid_buffer'>buffer</span><span class='period'>.</span><span class='id identifier rubyid_shift'>shift</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="put-instance_method">
#<strong>put</strong>(item) ⇒ <tt>Boolean</tt>
</h3><div class="docstring">
<div class="discussion">
<p>Put an item onto the buffer if possible. If the buffer is open
but not able to accept the item the calling thread will block
until the item can be put onto the buffer.</p>
<p>New items can be put onto the buffer until the number of items in
the buffer reaches the <span class='object_link'><a href="Base.html#size-instance_method" title="Concurrent::Channel::Buffer::Base#size (method)">Concurrent::Channel::Buffer::Base#size</a></span> value specified during
initialization.</p>
</div>
</div>
<div class="tags">
<p class="tag_title">Parameters:</p>
<ul class="param">
<li>
<span class='name'>item</span>
<span class='type'>(<tt>Object</tt>)</span>
—
<div class='inline'><p>the item/value to put onto the buffer.</p>
</div>
</li>
</ul>
<p class="tag_title">Returns:</p>
<ul class="return">
<li>
<span class='type'>(<tt>Boolean</tt>)</span>
—
<div class='inline'><p>true if the item was added to the buffer else
false (always false when closed).</p>
</div>
</li>
</ul>
</div><table class="source_code">
<tr>
<td>
<pre class="lines">
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</td>
<td>
<pre class="code"><span class="info file"># File 'lib-edge/concurrent/channel/buffer/buffered.rb', line 19</span>
<span class='kw'>def</span> <span class='id identifier rubyid_put'>put</span><span class='lparen'>(</span><span class='id identifier rubyid_item'>item</span><span class='rparen'>)</span>
<span class='id identifier rubyid_loop'>loop</span> <span class='kw'>do</span>
<span class='id identifier rubyid_synchronize'>synchronize</span> <span class='kw'>do</span>
<span class='kw'>if</span> <span class='id identifier rubyid_ns_closed?'>ns_closed?</span>
<span class='kw'>return</span> <span class='kw'>false</span>
<span class='kw'>elsif</span> <span class='op'>!</span><span class='id identifier rubyid_ns_full?'>ns_full?</span>
<span class='id identifier rubyid_ns_put_onto_buffer'>ns_put_onto_buffer</span><span class='lparen'>(</span><span class='id identifier rubyid_item'>item</span><span class='rparen'>)</span>
<span class='kw'>return</span> <span class='kw'>true</span>
<span class='kw'>end</span>
<span class='kw'>end</span>
<span class='const'>Thread</span><span class='period'>.</span><span class='id identifier rubyid_pass'>pass</span>
<span class='kw'>end</span>
<span class='kw'>end</span></pre>
</td>
</tr>
</table>
</div>
<div class="method_details ">
<h3 class="signature " id="take-instance_method">
#<strong>take</strong> ⇒ <tt>Object</tt>
</h3><div class="docstring">
<div class="discussion">
<p>Take an item from the buffer if one is available. If the buffer
is open and no item is available the calling thread will block
until an item is available. If the buffer is closed but items
are available the remaining items can still be taken. Once the
buffer closes, no remaining items can be taken.</p>
</div>
</div>
<div class="tags">
<p class="tag_title">Returns:</p>
<ul class="return">
<li>
<span class='type'>(<tt>Object</tt>)</span>
—
<div class='inline'><p>the item removed from the buffer; <code>Concurrent::NULL</code> once
the buffer has closed.</p>
</div>
</li>
</ul>
</div><table class="source_code">
<tr>
<td>
<pre class="lines">
50
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53</pre>
</td>
<td>
<pre class="code"><span class="info file"># File 'lib-edge/concurrent/channel/buffer/buffered.rb', line 50</span>
<span class='kw'>def</span> <span class='id identifier rubyid_take'>take</span>
<span class='id identifier rubyid_item'>item</span><span class='comma'>,</span> <span class='id identifier rubyid__'>_</span> <span class='op'>=</span> <span class='kw'>self</span><span class='period'>.</span><span class='id identifier rubyid_next'>next</span>
<span class='id identifier rubyid_item'>item</span>
<span class='kw'>end</span></pre>
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