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Throttle.html
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Throttle.html
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<!DOCTYPE html>
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Class: Concurrent::Throttle
— Concurrent Ruby
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<div id="content"><h1>Class: Concurrent::Throttle
</h1>
<div class="box_info">
<dl>
<dt>Inherits:</dt>
<dd>
<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::Throttle</li>
</ul>
<a href="#" class="inheritanceTree">show all</a>
</dd>
</dl>
<dl>
<dt>Includes:</dt>
<dd><span class='object_link'><a href="Throttle/PromisesIntegration.html" title="Concurrent::Throttle::PromisesIntegration (module)">PromisesIntegration</a></span></dd>
</dl>
<dl>
<dt>Defined in:</dt>
<dd>lib-edge/concurrent/edge/throttle.rb</dd>
</dl>
</div>
<h2>Overview</h2><div class="docstring">
<div class="discussion">
<div class="note notetag">
<strong>Note:</strong>
<div class='inline'><p><strong>Edge Features</strong> are under active development and may change frequently.</p>
<ul>
<li> Deprecations are not added before incompatible changes.</li>
<li> Edge version: <em>major</em> is always 0, <em>minor</em> bump means incompatible change,
<em>patch</em> bump means compatible change.</li>
<li> Edge features may also lack tests and documentation.</li>
<li> Features developed in <code>concurrent-ruby-edge</code> are expected to move
to <code>concurrent-ruby</code> when finalised.</li>
</ul>
</div>
</div>
<p>A tool manage concurrency level of future tasks.</p>
</div>
</div>
<div class="tags">
<div class="examples">
<p class="tag_title">Examples:</p>
<pre class="example code"><code><span class='id identifier rubyid_data'>data</span> <span class='op'>=</span> <span class='lparen'>(</span><span class='int'>1</span><span class='op'>..</span><span class='int'>5</span><span class='rparen'>)</span><span class='period'>.</span><span class='id identifier rubyid_to_a'>to_a</span>
<span class='id identifier rubyid_db'>db</span> <span class='op'>=</span> <span class='id identifier rubyid_data'>data</span><span class='period'>.</span><span class='id identifier rubyid_reduce'>reduce</span><span class='lparen'>(</span><span class='lbrace'>{</span><span class='rbrace'>}</span><span class='rparen'>)</span> <span class='lbrace'>{</span> <span class='op'>|</span><span class='id identifier rubyid_h'>h</span><span class='comma'>,</span> <span class='id identifier rubyid_v'>v</span><span class='op'>|</span> <span class='id identifier rubyid_h'>h</span><span class='period'>.</span><span class='id identifier rubyid_update'>update</span> <span class='id identifier rubyid_v'>v</span> <span class='op'>=></span> <span class='id identifier rubyid_v'>v</span><span class='period'>.</span><span class='id identifier rubyid_to_s'>to_s</span> <span class='rbrace'>}</span>
<span class='id identifier rubyid_max_two'>max_two</span> <span class='op'>=</span> <span class='const'>Throttle</span><span class='period'>.</span><span class='id identifier rubyid_new'><span class='object_link'><a href="Synchronization/Object.html#new-class_method" title="Concurrent::Synchronization::Object.new (method)">new</a></span></span> <span class='int'>2</span>
<span class='id identifier rubyid_futures'>futures</span> <span class='op'>=</span> <span class='id identifier rubyid_data'>data</span><span class='period'>.</span><span class='id identifier rubyid_map'>map</span> <span class='kw'>do</span> <span class='op'>|</span><span class='id identifier rubyid_data'>data</span><span class='op'>|</span>
<span class='const'><span class='object_link'><a href="Promises.html" title="Concurrent::Promises (module)">Promises</a></span></span><span class='period'>.</span><span class='id identifier rubyid_future'><span class='object_link'><a href="Promises/FactoryMethods.html#future-instance_method" title="Concurrent::Promises::FactoryMethods#future (method)">future</a></span></span><span class='lparen'>(</span><span class='id identifier rubyid_data'>data</span><span class='rparen'>)</span> <span class='kw'>do</span> <span class='op'>|</span><span class='id identifier rubyid_data'>data</span><span class='op'>|</span>
<span class='comment'># un-throttled, concurrency level equal data.size
</span> <span class='id identifier rubyid_data'>data</span> <span class='op'>+</span> <span class='int'>1</span>
<span class='kw'>end</span><span class='period'>.</span><span class='id identifier rubyid_then_throttled_by'>then_throttled_by</span><span class='lparen'>(</span><span class='id identifier rubyid_max_two'>max_two</span><span class='comma'>,</span> <span class='id identifier rubyid_db'>db</span><span class='rparen'>)</span> <span class='kw'>do</span> <span class='op'>|</span><span class='id identifier rubyid_v'>v</span><span class='comma'>,</span> <span class='id identifier rubyid_db'>db</span><span class='op'>|</span>
<span class='comment'># throttled, only 2 tasks executed at the same time
</span> <span class='comment'># e.g. limiting access to db
</span> <span class='id identifier rubyid_db'>db</span><span class='lbracket'>[</span><span class='id identifier rubyid_v'>v</span><span class='rbracket'>]</span>
<span class='kw'>end</span>
<span class='kw'>end</span>
<span class='id identifier rubyid_futures'>futures</span><span class='period'>.</span><span class='id identifier rubyid_map'>map</span><span class='lparen'>(</span><span class='op'>&</span><span class='symbol'>:value!</span><span class='rparen'>)</span> <span class='comment'># => [2, 3, 4, 5, nil]</span></code></pre>
<pre class="example code"><code><span class='id identifier rubyid_throttle'>throttle</span><span class='period'>.</span><span class='id identifier rubyid_throttled_future'>throttled_future</span><span class='lparen'>(</span><span class='int'>1</span><span class='rparen'>)</span> <span class='kw'>do</span> <span class='op'>|</span><span class='id identifier rubyid_arg'>arg</span><span class='op'>|</span>
<span class='id identifier rubyid_arg'>arg</span><span class='period'>.</span><span class='id identifier rubyid_succ'>succ</span>
<span class='kw'>end</span></code></pre>
<pre class="example code"><code><span class='id identifier rubyid_throttle'>throttle</span><span class='period'>.</span><span class='id identifier rubyid_throttled_future_chain'>throttled_future_chain</span> <span class='kw'>do</span> <span class='op'>|</span><span class='id identifier rubyid_trigger'>trigger</span><span class='op'>|</span>
<span class='id identifier rubyid_trigger'>trigger</span><span class='period'>.</span>
<span class='comment'># 2 throttled promises
</span> <span class='id identifier rubyid_chain'>chain</span> <span class='lbrace'>{</span> <span class='int'>1</span> <span class='rbrace'>}</span><span class='period'>.</span>
<span class='id identifier rubyid_then'>then</span><span class='lparen'>(</span><span class='op'>&</span><span class='symbol'>:succ</span><span class='rparen'>)</span>
<span class='kw'>end</span></code></pre>
<pre class="example code"><code><span class='id identifier rubyid_max_two'>max_two</span> <span class='op'>=</span> <span class='const'>Throttle</span><span class='period'>.</span><span class='id identifier rubyid_new'><span class='object_link'><a href="Synchronization/Object.html#new-class_method" title="Concurrent::Synchronization::Object.new (method)">new</a></span></span> <span class='int'>2</span>
<span class='int'>10</span><span class='period'>.</span><span class='id identifier rubyid_times'>times</span><span class='period'>.</span><span class='id identifier rubyid_map'>map</span> <span class='kw'>do</span>
<span class='const'>Thread</span><span class='period'>.</span><span class='id identifier rubyid_new'>new</span> <span class='kw'>do</span>
<span class='id identifier rubyid_max_two'>max_two</span><span class='period'>.</span><span class='id identifier rubyid_throttled_block'>throttled_block</span> <span class='kw'>do</span>
<span class='comment'># Only 2 at the same time
</span> <span class='id identifier rubyid_do_stuff'>do_stuff</span>
<span class='kw'>end</span>
<span class='kw'>end</span>
<span class='kw'>end</span></code></pre>
</div>
</div><h2>Defined Under Namespace</h2>
<p class="children">
<strong class="modules">Modules:</strong> <span class='object_link'><a href="Throttle/PromisesIntegration.html" title="Concurrent::Throttle::PromisesIntegration (module)">PromisesIntegration</a></span>
</p>
<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)">#<strong>initialize</strong>(limit) ⇒ Throttle </a>
</span>
<span class="note title constructor">constructor</span>
<span class="summary_desc"><div class='inline'><p>New throttle.</p>
</div></span>
</li>
<li class="public ">
<span class="summary_signature">
<a href="#limit-instance_method" title="#limit (instance method)">#<strong>limit</strong> ⇒ Integer </a>
</span>
<span class="summary_desc"><div class='inline'><p>The limit.</p>
</div></span>
</li>
<li class="public ">
<span class="summary_signature">
<a href="#release-instance_method" title="#release (instance method)">#<strong>release</strong> ⇒ self </a>
</span>
<span class="summary_desc"><div class='inline'><p>Has to be called once for each trigger after it is ok to execute another throttled task.</p>
</div></span>
</li>
<li class="public ">
<span class="summary_signature">
<a href="#throttled_block-instance_method" title="#throttled_block (instance method)">#<strong>throttled_block</strong> { ... } ⇒ Object </a>
</span>
<span class="summary_desc"><div class='inline'><p>Blocks current thread until the block can be executed.</p>
</div></span>
</li>
<li class="public ">
<span class="summary_signature">
<a href="#throttled_future-instance_method" title="#throttled_future (instance method)">#<strong>throttled_future</strong>(*args, &task) ⇒ Promises::Future </a>
</span>
<span class="note title not_defined_here">
included
from <span class='object_link'><a href="Throttle/PromisesIntegration.html#throttled_future-instance_method" title="Concurrent::Throttle::PromisesIntegration#throttled_future (method)">PromisesIntegration</a></span>
</span>
<span class="summary_desc"><div class='inline'><p>Behaves as <span class='object_link'><a href="Promises/FactoryMethods.html#future-instance_method" title="Concurrent::Promises::FactoryMethods#future (method)">Promises::FactoryMethods#future</a></span> but the future is throttled.</p>
</div></span>
</li>
<li class="public ">
<span class="summary_signature">
<a href="#throttled_future_chain-instance_method" title="#throttled_future_chain (instance method)">#<strong>throttled_future_chain</strong> {|trigger| ... } ⇒ Promises::Event, Promises::Future </a>
</span>
<span class="note title not_defined_here">
included
from <span class='object_link'><a href="Throttle/PromisesIntegration.html#throttled_future_chain-instance_method" title="Concurrent::Throttle::PromisesIntegration#throttled_future_chain (method)">PromisesIntegration</a></span>
</span>
<span class="summary_desc"><div class='inline'><p>Allows to throttle a chain of promises.</p>
</div></span>
</li>
<li class="public ">
<span class="summary_signature">
<a href="#to_s-instance_method" title="#to_s (instance method)">#<strong>to_s</strong> ⇒ String </a>
(also: #inspect)
</span>
<span class="summary_desc"><div class='inline'><p>Short string representation.</p>
</div></span>
</li>
<li class="public ">
<span class="summary_signature">
<a href="#trigger-instance_method" title="#trigger (instance method)">#<strong>trigger</strong> ⇒ Promises::Event </a>
</span>
<span class="summary_desc"><div class='inline'><p>New event which will be resolved when depending tasks can execute.</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>(limit) ⇒ <tt><span class='object_link'><a href="" title="Concurrent::Throttle (class)">Throttle</a></span></tt>
</h3><div class="docstring">
<div class="discussion">
<p>New throttle.</p>
</div>
</div>
<div class="tags">
<p class="tag_title">Parameters:</p>
<ul class="param">
<li>
<span class='name'>limit</span>
<span class='type'>(<tt>Integer</tt>)</span>
</li>
</ul>
</div><table class="source_code">
<tr>
<td>
<pre class="lines">
61
62
63
64
65
66</pre>
</td>
<td>
<pre class="code"><span class="info file"># File 'lib-edge/concurrent/edge/throttle.rb', line 61</span>
<span class='kw'>def</span> <span class='id identifier rubyid_initialize'>initialize</span><span class='lparen'>(</span><span class='id identifier rubyid_limit'>limit</span><span class='rparen'>)</span>
<span class='kw'>super</span><span class='lparen'>(</span><span class='rparen'>)</span>
<span class='ivar'>@Limit</span> <span class='op'>=</span> <span class='id identifier rubyid_limit'>limit</span>
<span class='kw'>self</span><span class='period'>.</span><span class='id identifier rubyid_can_run'>can_run</span> <span class='op'>=</span> <span class='id identifier rubyid_limit'>limit</span>
<span class='ivar'>@Queue</span> <span class='op'>=</span> <span class='const'>LockFreeQueue</span><span class='period'>.</span><span class='id identifier rubyid_new'><span class='object_link'><a href="Synchronization/Object.html#new-class_method" title="Concurrent::Synchronization::Object.new (method)">new</a></span></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="limit-instance_method">
#<strong>limit</strong> ⇒ <tt>Integer</tt>
</h3><div class="docstring">
<div class="discussion">
<p>Returns The limit.</p>
</div>
</div>
<div class="tags">
<p class="tag_title">Returns:</p>
<ul class="return">
<li>
<span class='type'>(<tt>Integer</tt>)</span>
—
<div class='inline'><p>The limit.</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/edge/throttle.rb', line 69</span>
<span class='kw'>def</span> <span class='id identifier rubyid_limit'>limit</span>
<span class='ivar'>@Limit</span>
<span class='kw'>end</span></pre>
</td>
</tr>
</table>
</div>
<div class="method_details ">
<h3 class="signature " id="release-instance_method">
#<strong>release</strong> ⇒ <tt>self</tt>
</h3><div class="docstring">
<div class="discussion">
<p>Has to be called once for each trigger after it is ok to execute another throttled task.</p>
</div>
</div>
<div class="tags">
<p class="tag_title">Returns:</p>
<ul class="return">
<li>
<span class='type'>(<tt>self</tt>)</span>
</li>
</ul>
<p class="tag_title">See Also:</p>
<ul class="see">
<li><span class='object_link'><a href="#trigger-instance_method" title="Concurrent::Throttle#trigger (method)">#trigger</a></span></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/edge/throttle.rb', line 95</span>
<span class='kw'>def</span> <span class='id identifier rubyid_release'>release</span>
<span class='kw'>while</span> <span class='kw'>true</span>
<span class='id identifier rubyid_current_can_run'>current_can_run</span> <span class='op'>=</span> <span class='id identifier rubyid_can_run'>can_run</span>
<span class='kw'>if</span> <span class='id identifier rubyid_compare_and_set_can_run'>compare_and_set_can_run</span> <span class='id identifier rubyid_current_can_run'>current_can_run</span><span class='comma'>,</span> <span class='id identifier rubyid_current_can_run'>current_can_run</span> <span class='op'>+</span> <span class='int'>1</span>
<span class='kw'>if</span> <span class='id identifier rubyid_current_can_run'>current_can_run</span> <span class='op'><</span> <span class='int'>0</span>
<span class='comment'># release called after trigger which pushed a trigger, busy wait is ok
</span> <span class='const'>Thread</span><span class='period'>.</span><span class='id identifier rubyid_pass'>pass</span> <span class='kw'>until</span> <span class='lparen'>(</span><span class='id identifier rubyid_trigger'>trigger</span> <span class='op'>=</span> <span class='ivar'>@Queue</span><span class='period'>.</span><span class='id identifier rubyid_pop'>pop</span><span class='rparen'>)</span>
<span class='id identifier rubyid_trigger'>trigger</span><span class='period'>.</span><span class='id identifier rubyid_resolve'>resolve</span>
<span class='kw'>end</span>
<span class='kw'>return</span> <span class='kw'>self</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="throttled_block-instance_method">
#<strong>throttled_block</strong> { ... } ⇒ <tt>Object</tt>
</h3><div class="docstring">
<div class="discussion">
<p>Blocks current thread until the block can be executed.</p>
</div>
</div>
<div class="tags">
<div class="examples">
<p class="tag_title">Examples:</p>
<pre class="example code"><code><span class='id identifier rubyid_max_two'>max_two</span> <span class='op'>=</span> <span class='const'><span class='object_link'><a href="" title="Concurrent::Throttle (class)">Throttle</a></span></span><span class='period'>.</span><span class='id identifier rubyid_new'><span class='object_link'><a href="Synchronization/Object.html#new-class_method" title="Concurrent::Synchronization::Object.new (method)">new</a></span></span> <span class='int'>2</span>
<span class='int'>10</span><span class='period'>.</span><span class='id identifier rubyid_times'>times</span><span class='period'>.</span><span class='id identifier rubyid_map'>map</span> <span class='kw'>do</span>
<span class='const'>Thread</span><span class='period'>.</span><span class='id identifier rubyid_new'>new</span> <span class='kw'>do</span>
<span class='id identifier rubyid_max_two'>max_two</span><span class='period'>.</span><span class='id identifier rubyid_throttled_block'>throttled_block</span> <span class='kw'>do</span>
<span class='comment'># Only 2 at the same time
</span> <span class='id identifier rubyid_do_stuff'>do_stuff</span>
<span class='kw'>end</span>
<span class='kw'>end</span>
<span class='kw'>end</span></code></pre>
</div>
<p class="tag_title">Yields:</p>
<ul class="yield">
<li>
<span class='type'></span>
<div class='inline'><p>to throttled block</p>
</div>
</li>
</ul>
<p class="tag_title">Yield Returns:</p>
<ul class="yieldreturn">
<li>
<span class='type'>(<tt>Object</tt>)</span>
—
<div class='inline'><p>is used as a result of the method</p>
</div>
</li>
</ul>
<p class="tag_title">Returns:</p>
<ul class="return">
<li>
<span class='type'>(<tt>Object</tt>)</span>
—
<div class='inline'><p>the result of the block</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/edge/throttle.rb', line 114</span>
<span class='kw'>def</span> <span class='id identifier rubyid_throttled_block'>throttled_block</span><span class='lparen'>(</span><span class='op'>&</span><span class='id identifier rubyid_block'>block</span><span class='rparen'>)</span>
<span class='id identifier rubyid_trigger'>trigger</span><span class='period'>.</span><span class='id identifier rubyid_wait'>wait</span>
<span class='id identifier rubyid_block'>block</span><span class='period'>.</span><span class='id identifier rubyid_call'>call</span>
<span class='kw'>ensure</span>
<span class='id identifier rubyid_release'>release</span>
<span class='kw'>end</span></pre>
</td>
</tr>
</table>
</div>
<div class="method_details ">
<h3 class="signature " id="throttled_future-instance_method">
#<strong>throttled_future</strong>(*args, &task) ⇒ <tt><span class='object_link'><a href="Promises/Future.html" title="Concurrent::Promises::Future (class)">Promises::Future</a></span></tt>
<span class="not_defined_here">
Originally defined in module
<span class='object_link'><a href="Throttle/PromisesIntegration.html#throttled_future-instance_method" title="Concurrent::Throttle::PromisesIntegration#throttled_future (method)">PromisesIntegration</a></span>
</span>
</h3><div class="docstring">
<div class="discussion">
<p>Behaves as <span class='object_link'><a href="Promises/FactoryMethods.html#future-instance_method" title="Concurrent::Promises::FactoryMethods#future (method)">Promises::FactoryMethods#future</a></span> but the future is throttled.</p>
</div>
</div>
<div class="tags">
<div class="examples">
<p class="tag_title">Examples:</p>
<pre class="example code"><code><span class='id identifier rubyid_throttle'>throttle</span><span class='period'>.</span><span class='id identifier rubyid_throttled_future'>throttled_future</span><span class='lparen'>(</span><span class='int'>1</span><span class='rparen'>)</span> <span class='kw'>do</span> <span class='op'>|</span><span class='id identifier rubyid_arg'>arg</span><span class='op'>|</span>
<span class='id identifier rubyid_arg'>arg</span><span class='period'>.</span><span class='id identifier rubyid_succ'>succ</span>
<span class='kw'>end</span></code></pre>
</div>
<p class="tag_title">Returns:</p>
<ul class="return">
<li>
<span class='type'>(<tt><span class='object_link'><a href="Promises/Future.html" title="Concurrent::Promises::Future (class)">Promises::Future</a></span></tt>)</span>
</li>
</ul>
<p class="tag_title">See Also:</p>
<ul class="see">
<li><span class='object_link'><a href="Promises/FactoryMethods.html#future-instance_method" title="Concurrent::Promises::FactoryMethods#future (method)">Promises::FactoryMethods#future</a></span></li>
</ul>
</div>
</div>
<div class="method_details ">
<h3 class="signature " id="throttled_future_chain-instance_method">
#<strong>throttled_future_chain</strong> {|trigger| ... } ⇒ <tt><span class='object_link'><a href="Promises/Event.html" title="Concurrent::Promises::Event (class)">Promises::Event</a></span></tt>, <tt><span class='object_link'><a href="Promises/Future.html" title="Concurrent::Promises::Future (class)">Promises::Future</a></span></tt>
<span class="not_defined_here">
Originally defined in module
<span class='object_link'><a href="Throttle/PromisesIntegration.html#throttled_future_chain-instance_method" title="Concurrent::Throttle::PromisesIntegration#throttled_future_chain (method)">PromisesIntegration</a></span>
</span>
</h3><div class="docstring">
<div class="discussion">
<p>Allows to throttle a chain of promises.</p>
</div>
</div>
<div class="tags">
<div class="examples">
<p class="tag_title">Examples:</p>
<pre class="example code"><code><span class='id identifier rubyid_throttle'>throttle</span><span class='period'>.</span><span class='id identifier rubyid_throttled_future_chain'>throttled_future_chain</span> <span class='kw'>do</span> <span class='op'>|</span><span class='id identifier rubyid_trigger'>trigger</span><span class='op'>|</span>
<span class='id identifier rubyid_trigger'>trigger</span><span class='period'>.</span>
<span class='comment'># 2 throttled promises
</span> <span class='id identifier rubyid_chain'>chain</span> <span class='lbrace'>{</span> <span class='int'>1</span> <span class='rbrace'>}</span><span class='period'>.</span>
<span class='id identifier rubyid_then'>then</span><span class='lparen'>(</span><span class='op'>&</span><span class='symbol'>:succ</span><span class='rparen'>)</span>
<span class='kw'>end</span></code></pre>
</div>
<p class="tag_title">Yields:</p>
<ul class="yield">
<li>
<span class='type'>(<tt><span class='object_link'><a href="#trigger-instance_method" title="Concurrent::Throttle#trigger (method)">trigger</a></span></tt>)</span>
—
<div class='inline'><p>a trigger which has to be used to build up a chain of promises, the last one is result
of the block. When the last one resolves, <span class='object_link'><a href="#release-instance_method" title="Concurrent::Throttle#release (method)">Concurrent::Throttle#release</a></span> is called on the throttle.</p>
</div>
</li>
</ul>
<p class="tag_title">Yield Parameters:</p>
<ul class="yieldparam">
<li>
<span class='name'>trigger</span>
<span class='type'>(<tt><span class='object_link'><a href="Promises/Event.html" title="Concurrent::Promises::Event (class)">Promises::Event</a></span></tt>, <tt><span class='object_link'><a href="Promises/Future.html" title="Concurrent::Promises::Future (class)">Promises::Future</a></span></tt>)</span>
</li>
</ul>
<p class="tag_title">Yield Returns:</p>
<ul class="yieldreturn">
<li>
<span class='type'>(<tt><span class='object_link'><a href="Promises/Event.html" title="Concurrent::Promises::Event (class)">Promises::Event</a></span></tt>, <tt><span class='object_link'><a href="Promises/Future.html" title="Concurrent::Promises::Future (class)">Promises::Future</a></span></tt>)</span>
—
<div class='inline'><p>The final future of the throttled chain.</p>
</div>
</li>
</ul>
<p class="tag_title">Returns:</p>
<ul class="return">
<li>
<span class='type'>(<tt><span class='object_link'><a href="Promises/Event.html" title="Concurrent::Promises::Event (class)">Promises::Event</a></span></tt>, <tt><span class='object_link'><a href="Promises/Future.html" title="Concurrent::Promises::Future (class)">Promises::Future</a></span></tt>)</span>
—
<div class='inline'><p>The final future of the throttled chain.</p>
</div>
</li>
</ul>
</div>
</div>
<div class="method_details ">
<h3 class="signature " id="to_s-instance_method">
#<strong>to_s</strong> ⇒ <tt>String</tt>
<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">
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123
124</pre>
</td>
<td>
<pre class="code"><span class="info file"># File 'lib-edge/concurrent/edge/throttle.rb', line 122</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 limit:%s can_run:%d></span><span class='tstring_end'>'</span></span><span class='comma'>,</span> <span class='kw'>super</span><span class='lbracket'>[</span><span class='int'>0</span><span class='op'>..</span><span class='op'>-</span><span class='int'>2</span><span class='rbracket'>]</span><span class='comma'>,</span> <span class='ivar'>@Limit</span><span class='comma'>,</span> <span class='id identifier rubyid_can_run'>can_run</span>
<span class='kw'>end</span></pre>
</td>
</tr>
</table>
</div>
<div class="method_details ">
<h3 class="signature " id="trigger-instance_method">
#<strong>trigger</strong> ⇒ <tt><span class='object_link'><a href="Promises/Event.html" title="Concurrent::Promises::Event (class)">Promises::Event</a></span></tt>
</h3><div class="docstring">
<div class="discussion">
<p>New event which will be resolved when depending tasks can execute.
Has to be used and after the critical work is done <span class='object_link'><a href="#release-instance_method" title="Concurrent::Throttle#release (method)">#release</a></span> must be called exactly once.</p>
</div>
</div>
<div class="tags">
<p class="tag_title">Returns:</p>
<ul class="return">
<li>
<span class='type'>(<tt><span class='object_link'><a href="Promises/Event.html" title="Concurrent::Promises::Event (class)">Promises::Event</a></span></tt>)</span>
</li>
</ul>
<p class="tag_title">See Also:</p>
<ul class="see">
<li><span class='object_link'><a href="#release-instance_method" title="Concurrent::Throttle#release (method)">#release</a></span></li>
</ul>
</div><table class="source_code">
<tr>
<td>