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TimerSet.html
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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::TimerSet
— Concurrent Ruby
</title>
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<div id="content"><h1>Class: Concurrent::TimerSet
</h1>
<div class="box_info">
<dl>
<dt>Inherits:</dt>
<dd>
<span class="inheritName"><span class='object_link'>RubyExecutorService</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'>AbstractExecutorService</span></li>
<li class="next"><span class='object_link'>RubyExecutorService</span></li>
<li class="next">Concurrent::TimerSet</li>
</ul>
<a href="#" class="inheritanceTree">show all</a>
</dd>
</dl>
<dl>
<dt>Defined in:</dt>
<dd>lib/concurrent/executor/timer_set.rb</dd>
</dl>
</div>
<h2>Overview</h2><div class="docstring">
<div class="discussion">
<div class="note notetag">
<strong>Note:</strong>
<div class='inline'><p>Time calculations on all platforms and languages are sensitive to
changes to the system clock. To alleviate the potential problems
associated with changing the system clock while an application is running,
most modern operating systems provide a monotonic clock that operates
independently of the system clock. A monotonic clock cannot be used to
determine human-friendly clock times. A monotonic clock is used exclusively
for calculating time intervals. Not all Ruby platforms provide access to an
operating system monotonic clock. On these platforms a pure-Ruby monotonic
clock will be used as a fallback. An operating system monotonic clock is both
faster and more reliable than the pure-Ruby implementation. The pure-Ruby
implementation should be fast and reliable enough for most non-realtime
operations. At this time the common Ruby platforms that provide access to an
operating system monotonic clock are MRI 2.1 and above and JRuby (all versions).</p>
</div>
</div>
<p>Executes a collection of tasks, each after a given delay. A master task
monitors the set and schedules each task for execution at the appropriate
time. Tasks are run on the global thread pool or on the supplied executor.
Each task is represented as a <code>ScheduledTask</code>.</p>
</div>
</div>
<div class="tags">
<p class="tag_title">See Also:</p>
<ul class="see">
<li><span class='object_link'><a href="ScheduledTask.html" title="Concurrent::ScheduledTask (class)">ScheduledTask</a></span></li>
<li><a href="http://linux.die.net/man/3/clock_gettime" target="_parent" title="Linux clock_gettime(3)">Linux clock_gettime(3)</a></li>
</ul>
</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="#initialize-instance_method" title="#initialize (instance method)">#<strong>initialize</strong>(opts = {}) ⇒ TimerSet </a>
</span>
<span class="note title constructor">constructor</span>
<span class="summary_desc"><div class='inline'><p>Create a new set of timed tasks.</p>
</div></span>
</li>
<li class="public ">
<span class="summary_signature">
<a href="#kill-instance_method" title="#kill (instance method)">#<strong>kill</strong> ⇒ undocumented </a>
</span>
<span class="summary_desc"><div class='inline'><p>Begin an immediate shutdown.</p>
</div></span>
</li>
<li class="public ">
<span class="summary_signature">
<a href="#post-instance_method" title="#post (instance method)">#<strong>post</strong>(delay, *args) { ... } ⇒ Concurrent::ScheduledTask, false </a>
</span>
<span class="summary_desc"><div class='inline'><p>Post a task to be execute run after a given delay (in seconds).</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>(opts = {}) ⇒ <tt><span class='object_link'><a href="" title="Concurrent::TimerSet (class)">TimerSet</a></span></tt>
</h3><div class="docstring">
<div class="discussion">
<p>Create a new set of timed tasks.</p>
</div>
</div>
<div class="tags">
<p class="tag_title">Parameters:</p>
<ul class="param">
<li>
<span class='name'>opts</span>
<span class='type'>(<tt><span class='object_link'><a href="Hash.html" title="Concurrent::Hash (class)">Hash</a></span></tt>)</span>
<em class="default">(defaults to: <tt>{}</tt>)</em>
—
<div class='inline'><p>the options used to specify the executor on which to perform actions</p>
</div>
</li>
</ul>
<p class="tag_title">Options Hash (<tt>opts</tt>):</p>
<ul class="option">
<li>
<span class="name">:executor</span>
<span class="type">(<tt>Executor</tt>)</span>
<span class="default">
</span>
— <div class='inline'><p>when set use the given <code>Executor</code> instance.
Three special values are also supported: <code>:task</code> returns the global task pool,
<code>:operation</code> returns the global operation pool, and <code>:immediate</code> returns a new
<code>ImmediateExecutor</code> object.</p>
</div>
</li>
</ul>
</div><table class="source_code">
<tr>
<td>
<pre class="lines">
30
31
32</pre>
</td>
<td>
<pre class="code"><span class="info file"># File 'lib/concurrent/executor/timer_set.rb', line 30</span>
<span class='kw'>def</span> <span class='id identifier rubyid_initialize'>initialize</span><span class='lparen'>(</span><span class='id identifier rubyid_opts'>opts</span> <span class='op'>=</span> <span class='lbrace'>{</span><span class='rbrace'>}</span><span class='rparen'>)</span>
<span class='kw'>super</span><span class='lparen'>(</span><span class='id identifier rubyid_opts'>opts</span><span class='rparen'>)</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="kill-instance_method">
#<strong>kill</strong> ⇒ <tt>undocumented</tt>
</h3><div class="docstring">
<div class="discussion">
<p>Begin an immediate shutdown. In-progress tasks will be allowed to
complete but enqueued tasks will be dismissed and no new tasks
will be accepted. Has no additional effect if the thread pool is
not running.</p>
</div>
</div>
<div class="tags">
</div><table class="source_code">
<tr>
<td>
<pre class="lines">
64
65
66</pre>
</td>
<td>
<pre class="code"><span class="info file"># File 'lib/concurrent/executor/timer_set.rb', line 64</span>
<span class='kw'>def</span> <span class='id identifier rubyid_kill'>kill</span>
<span class='id identifier rubyid_shutdown'>shutdown</span>
<span class='kw'>end</span></pre>
</td>
</tr>
</table>
</div>
<div class="method_details ">
<h3 class="signature " id="post-instance_method">
#<strong>post</strong>(delay, *args) { ... } ⇒ <tt><span class='object_link'><a href="ScheduledTask.html" title="Concurrent::ScheduledTask (class)">Concurrent::ScheduledTask</a></span></tt>, <tt>false</tt>
</h3><div class="docstring">
<div class="discussion">
<p>Post a task to be execute run after a given delay (in seconds). If the
delay is less than 1/100th of a second the task will be immediately post
to the executor.</p>
</div>
</div>
<div class="tags">
<p class="tag_title">Parameters:</p>
<ul class="param">
<li>
<span class='name'>delay</span>
<span class='type'>(<tt>Float</tt>)</span>
—
<div class='inline'><p>the number of seconds to wait for before executing the task.</p>
</div>
</li>
<li>
<span class='name'>args</span>
<span class='type'>(<tt><span class='object_link'><a href="Array.html" title="Concurrent::Array (class)">Array</a></span><Object></tt>)</span>
—
<div class='inline'><p>the arguments passed to the task on execution.</p>
</div>
</li>
</ul>
<p class="tag_title">Yields:</p>
<ul class="yield">
<li>
<span class='type'></span>
<div class='inline'><p>the task to be performed.</p>
</div>
</li>
</ul>
<p class="tag_title">Returns:</p>
<ul class="return">
<li>
<span class='type'>(<tt><span class='object_link'><a href="ScheduledTask.html" title="Concurrent::ScheduledTask (class)">Concurrent::ScheduledTask</a></span></tt>, <tt>false</tt>)</span>
—
<div class='inline'><p>IVar representing the task if the post
is successful; false after shutdown.</p>
</div>
</li>
</ul>
<p class="tag_title">Raises:</p>
<ul class="raise">
<li>
<span class='type'>(<tt>ArgumentError</tt>)</span>
—
<div class='inline'><p>if the intended execution time is not in the future.</p>
</div>
</li>
<li>
<span class='type'>(<tt>ArgumentError</tt>)</span>
—
<div class='inline'><p>if no block is given.</p>
</div>
</li>
</ul>
</div><table class="source_code">
<tr>
<td>
<pre class="lines">
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58</pre>
</td>
<td>
<pre class="code"><span class="info file"># File 'lib/concurrent/executor/timer_set.rb', line 48</span>
<span class='kw'>def</span> <span class='id identifier rubyid_post'>post</span><span class='lparen'>(</span><span class='id identifier rubyid_delay'>delay</span><span class='comma'>,</span> <span class='op'>*</span><span class='id identifier rubyid_args'>args</span><span class='comma'>,</span> <span class='op'>&</span><span class='id identifier rubyid_task'>task</span><span class='rparen'>)</span>
<span class='id identifier rubyid_raise'>raise</span> <span class='const'>ArgumentError</span><span class='period'>.</span><span class='id identifier rubyid_new'>new</span><span class='lparen'>(</span><span class='tstring'><span class='tstring_beg'>'</span><span class='tstring_content'>no block given</span><span class='tstring_end'>'</span></span><span class='rparen'>)</span> <span class='kw'>unless</span> <span class='id identifier rubyid_block_given?'>block_given?</span>
<span class='kw'>return</span> <span class='kw'>false</span> <span class='kw'>unless</span> <span class='id identifier rubyid_running?'>running?</span>
<span class='id identifier rubyid_opts'>opts</span> <span class='op'>=</span> <span class='lbrace'>{</span>
<span class='label'>executor:</span> <span class='ivar'>@task_executor</span><span class='comma'>,</span>
<span class='label'>args:</span> <span class='id identifier rubyid_args'>args</span><span class='comma'>,</span>
<span class='label'>timer_set:</span> <span class='kw'>self</span>
<span class='rbrace'>}</span>
<span class='id identifier rubyid_task'>task</span> <span class='op'>=</span> <span class='const'><span class='object_link'><a href="ScheduledTask.html" title="Concurrent::ScheduledTask (class)">ScheduledTask</a></span></span><span class='period'>.</span><span class='id identifier rubyid_execute'><span class='object_link'><a href="ScheduledTask.html#execute-class_method" title="Concurrent::ScheduledTask.execute (method)">execute</a></span></span><span class='lparen'>(</span><span class='id identifier rubyid_delay'>delay</span><span class='comma'>,</span> <span class='id identifier rubyid_opts'>opts</span><span class='comma'>,</span> <span class='op'>&</span><span class='id identifier rubyid_task'>task</span><span class='rparen'>)</span> <span class='comment'># may raise exception
</span> <span class='id identifier rubyid_task'>task</span><span class='period'>.</span><span class='id identifier rubyid_unscheduled?'>unscheduled?</span> <span class='op'>?</span> <span class='kw'>false</span> <span class='op'>:</span> <span class='id identifier rubyid_task'>task</span>
<span class='kw'>end</span></pre>
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