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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::Base
— Concurrent Ruby
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<div id="content"><h1>Class: Concurrent::Channel::Buffer::Base
</h1>
<div class="box_info">
<dl>
<dt>Inherits:</dt>
<dd>
<span class="inheritName"><span class='object_link'>Synchronization::LockableObject</span></span>
<ul class="fullTree">
<li>Object</li>
<li class="next"><span class='object_link'>Synchronization::LockableObject</span></li>
<li class="next">Concurrent::Channel::Buffer::Base</li>
</ul>
<a href="#" class="inheritanceTree">show all</a>
</dd>
</dl>
<dl>
<dt>Defined in:</dt>
<dd>lib-edge/concurrent/channel/buffer/base.rb</dd>
</dl>
</div>
<h2>Overview</h2><div class="docstring">
<div class="discussion">
<p>Abstract base class for all Channel buffers.</p>
<p><span class='object_link'><a href="../../Channel.html" title="Concurrent::Channel (class)">Concurrent::Channel</a></span> objects maintain an internal, queue-like
object called a buffer. It's the storage bin for values put onto or
taken from the channel. Different buffer types have different
characteristics. Subsequently, the behavior of any given channel is
highly dependent uping the type of its buffer. This is the base class
which defines the common buffer interface. Any class intended to be
used as a channel buffer should extend this class.</p>
</div>
</div>
<div class="tags">
</div><div id="subclasses">
<h2>Direct Known Subclasses</h2>
<p class="children"><span class='object_link'><a href="Buffered.html" title="Concurrent::Channel::Buffer::Buffered (class)">Buffered</a></span>, <span class='object_link'><a href="Timer.html" title="Concurrent::Channel::Buffer::Timer (class)">Timer</a></span>, <span class='object_link'><a href="Unbuffered.html" title="Concurrent::Channel::Buffer::Unbuffered (class)">Unbuffered</a></span></p>
</div>
<h2>Instance Attribute Summary <small><a href="#" class="summary_toggle">collapse</a></small></h2>
<ul class="summary">
<li class="public ">
<span class="summary_signature">
<a href="#capacity-instance_method" title="#capacity (instance method)">#<strong>capacity</strong> ⇒ undocumented </a>
</span>
<span class="note title readonly">readonly</span>
<span class="summary_desc"><div class='inline'><p>The maximum number of values which can be <span class='object_link'><a href="#put-instance_method" title="Concurrent::Channel::Buffer::Base#put (method)">#put</a></span> onto the buffer it becomes full.</p>
</div></span>
</li>
</ul>
<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="#blocking%3F-instance_method" title="#blocking? (instance method)">#<strong>blocking?</strong> ⇒ Boolean </a>
</span>
<span class="summary_desc"><div class='inline'><p>Predicate indicating if this buffer will block <span class='object_link'><a href="#put-instance_method" title="Concurrent::Channel::Buffer::Base#put (method)">#put</a></span> operations once it reaches its maximum capacity.</p>
</div></span>
</li>
<li class="public ">
<span class="summary_signature">
<a href="#close-instance_method" title="#close (instance method)">#<strong>close</strong> ⇒ Boolean </a>
</span>
<span class="summary_desc"><div class='inline'><p>Close the buffer, preventing new items from being added.</p>
</div></span>
</li>
<li class="public ">
<span class="summary_signature">
<a href="#closed%3F-instance_method" title="#closed? (instance method)">#<strong>closed?</strong> ⇒ Boolea </a>
</span>
<span class="summary_desc"><div class='inline'><p>Predicate indicating is this buffer closed.</p>
</div></span>
</li>
<li class="public ">
<span class="summary_signature">
<a href="#empty%3F-instance_method" title="#empty? (instance method)">#<strong>empty?</strong> ⇒ Boolean </a>
</span>
<span class="summary_desc"><div class='inline'><p>Predicate indicating if the buffer is empty.</p>
</div></span>
</li>
<li class="public ">
<span class="summary_signature">
<a href="#full%3F-instance_method" title="#full? (instance method)">#<strong>full?</strong> ⇒ Boolean </a>
</span>
<span class="summary_desc"><div class='inline'><p>Predicate indicating if the buffer is full.</p>
</div></span>
</li>
<li class="public ">
<span class="summary_signature">
<a href="#initialize-instance_method" title="#initialize (instance method)">#<strong>initialize</strong>(*args) ⇒ Base </a>
</span>
<span class="note title constructor">constructor</span>
<span class="summary_desc"><div class='inline'><p>Creates a new buffer.</p>
</div></span>
</li>
<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="#size-instance_method" title="#size (instance method)">#<strong>size</strong> ⇒ undocumented </a>
</span>
<span class="summary_desc"><div class='inline'><p>The number of items currently in the buffer.</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>
<div class="method_details first">
<h3 class="signature first" id="initialize-instance_method">
#<strong>initialize</strong>(*args) ⇒ <tt><span class='object_link'><a href="" title="Concurrent::Channel::Buffer::Base (class)">Base</a></span></tt>
</h3><div class="docstring">
<div class="discussion">
<p>Creates a new buffer.</p>
</div>
</div>
<div class="tags">
</div><table class="source_code">
<tr>
<td>
<pre class="lines">
27
28
29
30
31
32
33
34
35
36</pre>
</td>
<td>
<pre class="code"><span class="info file"># File 'lib-edge/concurrent/channel/buffer/base.rb', line 27</span>
<span class='kw'>def</span> <span class='id identifier rubyid_initialize'>initialize</span><span class='lparen'>(</span><span class='op'>*</span><span class='id identifier rubyid_args'>args</span><span class='rparen'>)</span>
<span class='kw'>super</span><span class='lparen'>(</span><span class='rparen'>)</span>
<span class='id identifier rubyid_synchronize'>synchronize</span> <span class='kw'>do</span>
<span class='ivar'>@closed</span> <span class='op'>=</span> <span class='kw'>false</span>
<span class='ivar'>@size</span> <span class='op'>=</span> <span class='int'>0</span>
<span class='ivar'>@capacity</span> <span class='op'>=</span> <span class='int'>0</span>
<span class='ivar'>@buffer</span> <span class='op'>=</span> <span class='kw'>nil</span>
<span class='id identifier rubyid_ns_initialize'>ns_initialize</span><span class='lparen'>(</span><span class='op'>*</span><span class='id identifier rubyid_args'>args</span><span class='rparen'>)</span>
<span class='kw'>end</span>
<span class='kw'>end</span></pre>
</td>
</tr>
</table>
</div>
</div>
<div id="instance_attr_details" class="attr_details">
<h2>Instance Attribute Details</h2>
<span id="capacity=-instance_method"></span>
<div class="method_details first">
<h3 class="signature first" id="capacity-instance_method">
#<strong>capacity</strong> ⇒ <tt>undocumented</tt>
</h3><div class="docstring">
<div class="discussion">
<p>The maximum number of values which can be <span class='object_link'><a href="#put-instance_method" title="Concurrent::Channel::Buffer::Base#put (method)">#put</a></span> onto the buffer
it becomes full.</p>
</div>
</div>
<div class="tags">
</div><table class="source_code">
<tr>
<td>
<pre class="lines">
22
23
24</pre>
</td>
<td>
<pre class="code"><span class="info file"># File 'lib-edge/concurrent/channel/buffer/base.rb', line 22</span>
<span class='kw'>def</span> <span class='id identifier rubyid_capacity'>capacity</span>
<span class='ivar'>@capacity</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="blocking?-instance_method">
#<strong>blocking?</strong> ⇒ <tt>Boolean</tt>
</h3><div class="docstring">
<div class="discussion">
<p>Predicate indicating if this buffer will block <span class='object_link'><a href="#put-instance_method" title="Concurrent::Channel::Buffer::Base#put (method)">#put</a></span> operations
once it reaches its maximum capacity.</p>
</div>
</div>
<div class="tags">
<p class="tag_title">Returns:</p>
<ul class="return">
<li>
<span class='type'>(<tt>Boolean</tt>)</span>
—
<div class='inline'><p>true if this buffer blocks else false</p>
</div>
</li>
</ul>
</div><table class="source_code">
<tr>
<td>
<pre class="lines">
44
45
46</pre>
</td>
<td>
<pre class="code"><span class="info file"># File 'lib-edge/concurrent/channel/buffer/base.rb', line 44</span>
<span class='kw'>def</span> <span class='id identifier rubyid_blocking?'>blocking?</span>
<span class='kw'>true</span>
<span class='kw'>end</span></pre>
</td>
</tr>
</table>
</div>
<div class="method_details ">
<h3 class="signature " id="close-instance_method">
#<strong>close</strong> ⇒ <tt>Boolean</tt>
</h3><div class="docstring">
<div class="discussion">
<p>Close the buffer, preventing new items from being added. Once a
buffer is closed it cannot be opened again.</p>
</div>
</div>
<div class="tags">
<p class="tag_title">Returns:</p>
<ul class="return">
<li>
<span class='type'>(<tt>Boolean</tt>)</span>
—
<div class='inline'><p>true if the buffer was open and successfully
closed else false.</p>
</div>
</li>
</ul>
</div><table class="source_code">
<tr>
<td>
<pre class="lines">
176
177
178
179
180</pre>
</td>
<td>
<pre class="code"><span class="info file"># File 'lib-edge/concurrent/channel/buffer/base.rb', line 176</span>
<span class='kw'>def</span> <span class='id identifier rubyid_close'>close</span>
<span class='id identifier rubyid_synchronize'>synchronize</span> <span class='kw'>do</span>
<span class='ivar'>@closed</span> <span class='op'>?</span> <span class='kw'>false</span> <span class='op'>:</span> <span class='ivar'>@closed</span> <span class='op'>=</span> <span class='kw'>true</span>
<span class='kw'>end</span>
<span class='kw'>end</span></pre>
</td>
</tr>
</table>
</div>
<div class="method_details ">
<h3 class="signature " id="closed?-instance_method">
#<strong>closed?</strong> ⇒ <tt>Boolea</tt>
</h3><div class="docstring">
<div class="discussion">
<p>Predicate indicating is this buffer closed.</p>
</div>
</div>
<div class="tags">
<p class="tag_title">Returns:</p>
<ul class="return">
<li>
<span class='type'>(<tt>Boolea</tt>)</span>
—
<div class='inline'><p>true when closed else false.</p>
</div>
</li>
</ul>
</div><table class="source_code">
<tr>
<td>
<pre class="lines">
187
188
189</pre>
</td>
<td>
<pre class="code"><span class="info file"># File 'lib-edge/concurrent/channel/buffer/base.rb', line 187</span>
<span class='kw'>def</span> <span class='id identifier rubyid_closed?'>closed?</span>
<span class='id identifier rubyid_synchronize'>synchronize</span> <span class='lbrace'>{</span> <span class='id identifier rubyid_ns_closed?'>ns_closed?</span> <span class='rbrace'>}</span>
<span class='kw'>end</span></pre>
</td>
</tr>
</table>
</div>
<div class="method_details ">
<h3 class="signature " id="empty?-instance_method">
#<strong>empty?</strong> ⇒ <tt>Boolean</tt>
</h3><div class="docstring">
<div class="discussion">
<p>Predicate indicating if the buffer is empty.</p>
</div>
</div>
<div class="tags">
<p class="tag_title">Returns:</p>
<ul class="return">
<li>
<span class='type'>(<tt>Boolean</tt>)</span>
—
<div class='inline'><p>true if this buffer is empty else false</p>
</div>
</li>
</ul>
<p class="tag_title">Raises:</p>
<ul class="raise">
<li>
<span class='type'>(<tt>NotImplementedError</tt>)</span>
—
<div class='inline'><p>until overridden in a subclass.</p>
</div>
</li>
</ul>
</div><table class="source_code">
<tr>
<td>
<pre class="lines">
62
63
64</pre>
</td>
<td>
<pre class="code"><span class="info file"># File 'lib-edge/concurrent/channel/buffer/base.rb', line 62</span>
<span class='kw'>def</span> <span class='id identifier rubyid_empty?'>empty?</span>
<span class='id identifier rubyid_synchronize'>synchronize</span> <span class='lbrace'>{</span> <span class='id identifier rubyid_ns_empty?'>ns_empty?</span> <span class='rbrace'>}</span>
<span class='kw'>end</span></pre>
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</table>
</div>
<div class="method_details ">
<h3 class="signature " id="full?-instance_method">
#<strong>full?</strong> ⇒ <tt>Boolean</tt>
</h3><div class="docstring">
<div class="discussion">
<p>Predicate indicating if the buffer is full.</p>
</div>
</div>
<div class="tags">
<p class="tag_title">Returns:</p>
<ul class="return">
<li>
<span class='type'>(<tt>Boolean</tt>)</span>
—
<div class='inline'><p>true if this buffer is full else false</p>
</div>
</li>
</ul>
<p class="tag_title">Raises:</p>
<ul class="raise">
<li>
<span class='type'>(<tt>NotImplementedError</tt>)</span>
—
<div class='inline'><p>until overridden in a subclass.</p>
</div>
</li>
</ul>
</div><table class="source_code">
<tr>
<td>
<pre class="lines">
73
74
75</pre>
</td>
<td>
<pre class="code"><span class="info file"># File 'lib-edge/concurrent/channel/buffer/base.rb', line 73</span>
<span class='kw'>def</span> <span class='id identifier rubyid_full?'>full?</span>
<span class='id identifier rubyid_synchronize'>synchronize</span> <span class='lbrace'>{</span> <span class='id identifier rubyid_ns_full?'>ns_full?</span> <span class='rbrace'>}</span>
<span class='kw'>end</span></pre>
</td>
</tr>
</table>
</div>
<div class="method_details ">
<h3 class="signature " 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>
<p class="tag_title">Raises:</p>
<ul class="raise">
<li>
<span class='type'>(<tt>NotImplementedError</tt>)</span>
—
<div class='inline'><p>until overridden in a subclass.</p>
</div>
</li>
</ul>
</div><table class="source_code">
<tr>
<td>
<pre class="lines">
151
152
153</pre>
</td>
<td>
<pre class="code"><span class="info file"># File 'lib-edge/concurrent/channel/buffer/base.rb', line 151</span>
<span class='kw'>def</span> <span class='kw'>next</span>
<span class='id identifier rubyid_raise'>raise</span> <span class='const'>NotImplementedError</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