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| <div class="subTitle">org.apache.edgent.topology.plumbing</div> |
| <h2 title="Class Valve" class="title">Class Valve<T></h2> |
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| <li><a href="http://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</a></li> |
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| <li>org.apache.edgent.topology.plumbing.Valve<T></li> |
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| <dd><code>T</code> - tuple type</dd> |
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| <dd><a href="http://docs.oracle.com/javase/8/docs/api/java/io/Serializable.html?is-external=true" title="class or interface in java.io">Serializable</a>, <a href="../../../../../org/apache/edgent/function/Predicate.html" title="interface in org.apache.edgent.function">Predicate</a><T></dd> |
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| <pre>public class <span class="typeNameLabel">Valve<T></span> |
| extends <a href="http://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a> |
| implements <a href="../../../../../org/apache/edgent/function/Predicate.html" title="interface in org.apache.edgent.function">Predicate</a><T></pre> |
| <div class="block">A generic "valve" <a href="../../../../../org/apache/edgent/function/Predicate.html" title="interface in org.apache.edgent.function"><code>Predicate</code></a>. |
| <p> |
| A valve is either open or closed. |
| When used as a Predicate to <code>TStream.filter()</code>, |
| filter passes tuples only when the valve is open. |
| </p><p> |
| A valve is typically used to dynamically control whether or not |
| some downstream tuple processing is enabled. A decision to change the |
| state of the valve may be a result of local analytics or an external |
| command. |
| <br> |
| E.g., in a simple case, a Valve might be used to control |
| whether or not logging or publishing of tuples is enabled. |
| </p> |
| <pre><code> |
| TStream<JsonObject> stream = ...; |
| |
| Valve<JsonObject> valve = new Valve<>(false); |
| stream.filter(valve).sink(someTupleLoggingConsumer); |
| |
| // from some analytic or device command handler... |
| valve.setOpen(true); |
| </code></pre></div> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../../serialized-form.html#org.apache.edgent.topology.plumbing.Valve">Serialized Form</a></dd> |
| </dl> |
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| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/edgent/topology/plumbing/Valve.html#Valve--">Valve</a></span>()</code> |
| <div class="block">Create a new Valve Predicate</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/edgent/topology/plumbing/Valve.html#Valve-boolean-">Valve</a></span>(boolean isOpen)</code> |
| <div class="block">Create a new Valve Predicate</div> |
| </td> |
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| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/edgent/topology/plumbing/Valve.html#isOpen--">isOpen</a></span>()</code> |
| <div class="block">Get the valve state</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/edgent/topology/plumbing/Valve.html#setOpen-boolean-">setOpen</a></span>(boolean isOpen)</code> |
| <div class="block">Set the valve state</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/edgent/topology/plumbing/Valve.html#test-T-">test</a></span>(<a href="../../../../../org/apache/edgent/topology/plumbing/Valve.html" title="type parameter in Valve">T</a> value)</code> |
| <div class="block">Test the state of the valve, <code>value</code> is ignored.</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code><a href="http://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/edgent/topology/plumbing/Valve.html#toString--">toString</a></span>()</code> |
| <div class="block">Returns a String for development/debug support.</div> |
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| </a> |
| <h3>Constructor Detail</h3> |
| <a name="Valve--"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>Valve</h4> |
| <pre>public Valve()</pre> |
| <div class="block">Create a new Valve Predicate |
| <p> |
| Same as <code>Valve(true)</code></div> |
| </li> |
| </ul> |
| <a name="Valve-boolean-"> |
| <!-- --> |
| </a> |
| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>Valve</h4> |
| <pre>public Valve(boolean isOpen)</pre> |
| <div class="block">Create a new Valve Predicate |
| <p></div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>isOpen</code> - the initial state</dd> |
| </dl> |
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| </li> |
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| <h4>setOpen</h4> |
| <pre>public void setOpen(boolean isOpen)</pre> |
| <div class="block">Set the valve state</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>isOpen</code> - true to open the valve</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="isOpen--"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>isOpen</h4> |
| <pre>public boolean isOpen()</pre> |
| <div class="block">Get the valve state</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the state, true if the valve is open, false otherwise</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="test-java.lang.Object-"> |
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| </a><a name="test-T-"> |
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| <h4>test</h4> |
| <pre>public boolean test(<a href="../../../../../org/apache/edgent/topology/plumbing/Valve.html" title="type parameter in Valve">T</a> value)</pre> |
| <div class="block">Test the state of the valve, <code>value</code> is ignored.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../../org/apache/edgent/function/Predicate.html#test-T-">test</a></code> in interface <code><a href="../../../../../org/apache/edgent/function/Predicate.html" title="interface in org.apache.edgent.function">Predicate</a><<a href="../../../../../org/apache/edgent/topology/plumbing/Valve.html" title="type parameter in Valve">T</a>></code></dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>value</code> - Value to be tested.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>true when the valve is open, false otherwise</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="toString--"> |
| <!-- --> |
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| <ul class="blockListLast"> |
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| <h4>toString</h4> |
| <pre>public <a href="http://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> toString()</pre> |
| <div class="block">Returns a String for development/debug support. Content subject to change.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Overrides:</span></dt> |
| <dd><code><a href="http://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#toString--" title="class or interface in java.lang">toString</a></code> in class <code><a href="http://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></code></dd> |
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