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| <div class="subTitle">org.apache.edgent.topology</div> |
| <h2 title="Interface Topology" class="title">Interface Topology</h2> |
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| <dt>All Superinterfaces:</dt> |
| <dd><a href="../../../../org/apache/edgent/topology/TopologyElement.html" title="interface in org.apache.edgent.topology">TopologyElement</a></dd> |
| </dl> |
| <dl> |
| <dt>All Known Implementing Classes:</dt> |
| <dd><a href="../../../../org/apache/edgent/topology/spi/AbstractTopology.html" title="class in org.apache.edgent.topology.spi">AbstractTopology</a>, <a href="../../../../org/apache/edgent/providers/direct/DirectTopology.html" title="class in org.apache.edgent.providers.direct">DirectTopology</a>, <a href="../../../../org/apache/edgent/topology/spi/graph/GraphTopology.html" title="class in org.apache.edgent.topology.spi.graph">GraphTopology</a></dd> |
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| <br> |
| <pre>public interface <span class="typeNameLabel">Topology</span> |
| extends <a href="../../../../org/apache/edgent/topology/TopologyElement.html" title="interface in org.apache.edgent.topology">TopologyElement</a></pre> |
| <div class="block">A declaration of a topology of streaming data. |
| |
| This class provides some fundamental generic methods to create source |
| streams, such as <a href="../../../../org/apache/edgent/topology/Topology.html#source-org.apache.edgent.function.Supplier-"><code>source</code></a>, |
| <a href="../../../../org/apache/edgent/topology/Topology.html#poll-org.apache.edgent.function.Supplier-long-java.util.concurrent.TimeUnit-"><code>poll</code></a>, |
| <a href="../../../../org/apache/edgent/topology/Topology.html#strings-java.lang.String...-"><code>strings</code></a>. |
| <P> |
| See <a href="doc-files/sources.html">Edgent Source Streams</a>. |
| </P></div> |
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| <h3>Method Summary</h3> |
| <table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Method Summary table, listing methods, and an explanation"> |
| <caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd"> </span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd"> </span></span><span id="t3" class="tableTab"><span><a href="javascript:show(4);">Abstract Methods</a></span><span class="tabEnd"> </span></span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Method and Description</th> |
| </tr> |
| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code><T> <a href="../../../../org/apache/edgent/topology/TStream.html" title="interface in org.apache.edgent.topology">TStream</a><T></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/edgent/topology/Topology.html#collection-java.util.Collection-">collection</a></span>(java.util.Collection<T> tuples)</code> |
| <div class="block">Declare a stream of constants from a collection.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code><T> <a href="../../../../org/apache/edgent/topology/TStream.html" title="interface in org.apache.edgent.topology">TStream</a><T></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/edgent/topology/Topology.html#events-org.apache.edgent.function.Consumer-">events</a></span>(<a href="../../../../org/apache/edgent/function/Consumer.html" title="interface in org.apache.edgent.function">Consumer</a><<a href="../../../../org/apache/edgent/function/Consumer.html" title="interface in org.apache.edgent.function">Consumer</a><T>> eventSetup)</code> |
| <div class="block">Declare a stream populated by an event system.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code><T> <a href="../../../../org/apache/edgent/topology/TStream.html" title="interface in org.apache.edgent.topology">TStream</a><T></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/edgent/topology/Topology.html#generate-org.apache.edgent.function.Supplier-">generate</a></span>(<a href="../../../../org/apache/edgent/function/Supplier.html" title="interface in org.apache.edgent.function">Supplier</a><T> data)</code> |
| <div class="block">Declare an endless source stream.</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>java.lang.String</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/edgent/topology/Topology.html#getName--">getName</a></span>()</code> |
| <div class="block">Name of this topology.</div> |
| </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code><a href="../../../../org/apache/edgent/function/Supplier.html" title="interface in org.apache.edgent.function">Supplier</a><<a href="../../../../org/apache/edgent/execution/services/RuntimeServices.html" title="interface in org.apache.edgent.execution.services">RuntimeServices</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/edgent/topology/Topology.html#getRuntimeServiceSupplier--">getRuntimeServiceSupplier</a></span>()</code> |
| <div class="block">Return a function that at execution time |
| will return a <a href="../../../../org/apache/edgent/execution/services/RuntimeServices.html" title="interface in org.apache.edgent.execution.services"><code>RuntimeServices</code></a> instance |
| a stream function can use.</div> |
| </td> |
| </tr> |
| <tr id="i5" class="rowColor"> |
| <td class="colFirst"><code><a href="../../../../org/apache/edgent/topology/tester/Tester.html" title="interface in org.apache.edgent.topology.tester">Tester</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/edgent/topology/Topology.html#getTester--">getTester</a></span>()</code> |
| <div class="block">Get the tester for this topology.</div> |
| </td> |
| </tr> |
| <tr id="i6" class="altColor"> |
| <td class="colFirst"><code><a href="../../../../org/apache/edgent/graph/Graph.html" title="interface in org.apache.edgent.graph">Graph</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/edgent/topology/Topology.html#graph--">graph</a></span>()</code> |
| <div class="block">Get the underlying graph.</div> |
| </td> |
| </tr> |
| <tr id="i7" class="rowColor"> |
| <td class="colFirst"><code><T> <a href="../../../../org/apache/edgent/topology/TStream.html" title="interface in org.apache.edgent.topology">TStream</a><T></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/edgent/topology/Topology.html#of-T...-">of</a></span>(T... values)</code> |
| <div class="block">Declare a stream of objects.</div> |
| </td> |
| </tr> |
| <tr id="i8" class="altColor"> |
| <td class="colFirst"><code><T> <a href="../../../../org/apache/edgent/topology/TStream.html" title="interface in org.apache.edgent.topology">TStream</a><T></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/edgent/topology/Topology.html#poll-org.apache.edgent.function.Supplier-long-java.util.concurrent.TimeUnit-">poll</a></span>(<a href="../../../../org/apache/edgent/function/Supplier.html" title="interface in org.apache.edgent.function">Supplier</a><T> data, |
| long period, |
| java.util.concurrent.TimeUnit unit)</code> |
| <div class="block">Declare a new source stream that calls <code>data.get()</code> periodically.</div> |
| </td> |
| </tr> |
| <tr id="i9" class="rowColor"> |
| <td class="colFirst"><code><T> <a href="../../../../org/apache/edgent/topology/TStream.html" title="interface in org.apache.edgent.topology">TStream</a><T></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/edgent/topology/Topology.html#source-org.apache.edgent.function.Supplier-">source</a></span>(<a href="../../../../org/apache/edgent/function/Supplier.html" title="interface in org.apache.edgent.function">Supplier</a><java.lang.Iterable<T>> data)</code> |
| <div class="block">Declare a new source stream that iterates over the return of |
| <code>Iterable<T> get()</code> from <code>data</code>.</div> |
| </td> |
| </tr> |
| <tr id="i10" class="altColor"> |
| <td class="colFirst"><code><a href="../../../../org/apache/edgent/topology/TStream.html" title="interface in org.apache.edgent.topology">TStream</a><java.lang.String></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/edgent/topology/Topology.html#strings-java.lang.String...-">strings</a></span>(java.lang.String... strings)</code> |
| <div class="block">Declare a stream of strings.</div> |
| </td> |
| </tr> |
| </table> |
| <ul class="blockList"> |
| <li class="blockList"><a name="methods.inherited.from.class.org.apache.edgent.topology.TopologyElement"> |
| <!-- --> |
| </a> |
| <h3>Methods inherited from interface org.apache.edgent.topology.<a href="../../../../org/apache/edgent/topology/TopologyElement.html" title="interface in org.apache.edgent.topology">TopologyElement</a></h3> |
| <code><a href="../../../../org/apache/edgent/topology/TopologyElement.html#topology--">topology</a></code></li> |
| </ul> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| </div> |
| <div class="details"> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <!-- ============ METHOD DETAIL ========== --> |
| <ul class="blockList"> |
| <li class="blockList"><a name="method.detail"> |
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| </a> |
| <h3>Method Detail</h3> |
| <a name="getName--"> |
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| <ul class="blockList"> |
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| <h4>getName</h4> |
| <pre>java.lang.String getName()</pre> |
| <div class="block">Name of this topology.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>Name of this topology.</dd> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../org/apache/edgent/topology/TopologyProvider.html#newTopology-java.lang.String-"><code>TopologyProvider.newTopology(String)</code></a></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="source-org.apache.edgent.function.Supplier-"> |
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| </a> |
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| <h4>source</h4> |
| <pre><T> <a href="../../../../org/apache/edgent/topology/TStream.html" title="interface in org.apache.edgent.topology">TStream</a><T> source(<a href="../../../../org/apache/edgent/function/Supplier.html" title="interface in org.apache.edgent.function">Supplier</a><java.lang.Iterable<T>> data)</pre> |
| <div class="block">Declare a new source stream that iterates over the return of |
| <code>Iterable<T> get()</code> from <code>data</code>. Once all the tuples from |
| <code>data.get()</code> have been submitted on the stream, no more tuples are |
| submitted. <BR> |
| The returned stream will be endless if the iterator returned from the |
| <code>Iterable</code> never completes. |
| <p> |
| If <code>data</code> implements <code>AutoCloseable</code>, its <code>close()</code> |
| method will be called when the topology's execution is terminated.</div> |
| <dl> |
| <dt><span class="paramLabel">Type Parameters:</span></dt> |
| <dd><code>T</code> - Tuple type</dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>data</code> - Function that produces that data for the stream.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>New stream containing the tuples from the iterator returned by |
| <code>data.get()</code>.</dd> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="doc-files/sources.html">Edgent Source Streams</a></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="generate-org.apache.edgent.function.Supplier-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>generate</h4> |
| <pre><T> <a href="../../../../org/apache/edgent/topology/TStream.html" title="interface in org.apache.edgent.topology">TStream</a><T> generate(<a href="../../../../org/apache/edgent/function/Supplier.html" title="interface in org.apache.edgent.function">Supplier</a><T> data)</pre> |
| <div class="block">Declare an endless source stream. <code>data.get()</code> will be called |
| repeatably. Each non-null returned value will be present on the stream. |
| <p> |
| If <code>data</code> implements <code>AutoCloseable</code>, its <code>close()</code> |
| method will be called when the topology's execution is terminated.</div> |
| <dl> |
| <dt><span class="paramLabel">Type Parameters:</span></dt> |
| <dd><code>T</code> - Tuple type</dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>data</code> - Supplier of the tuples.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>New stream containing the tuples from calls to <code>data.get()</code> |
| .</dd> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="doc-files/sources.html">Edgent Source Streams</a></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="poll-org.apache.edgent.function.Supplier-long-java.util.concurrent.TimeUnit-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>poll</h4> |
| <pre><T> <a href="../../../../org/apache/edgent/topology/TStream.html" title="interface in org.apache.edgent.topology">TStream</a><T> poll(<a href="../../../../org/apache/edgent/function/Supplier.html" title="interface in org.apache.edgent.function">Supplier</a><T> data, |
| long period, |
| java.util.concurrent.TimeUnit unit)</pre> |
| <div class="block">Declare a new source stream that calls <code>data.get()</code> periodically. |
| Each non-null value returned will appear on the returned stream. Thus |
| each call to {code data.get()} will result in zero tuples or one tuple on |
| the stream. |
| <p> |
| If <code>data</code> implements <code>AutoCloseable</code>, its <code>close()</code> |
| method will be called when the topology's execution is terminated. |
| </p><p> |
| The poll rate may be changed when the topology is running via a runtime |
| <a href="../../../../org/apache/edgent/execution/mbeans/PeriodMXBean.html" title="interface in org.apache.edgent.execution.mbeans"><code>PeriodMXBean</code></a>. |
| In order to use this mechanism the caller must provide a |
| alias for the stream when building the topology. |
| The <code>PeriodMXBean</code> is registered with the <a href="../../../../org/apache/edgent/execution/services/ControlService.html" title="interface in org.apache.edgent.execution.services"><code>ControlService</code></a> |
| with type <a href="../../../../org/apache/edgent/topology/TStream.html#TYPE"><code>TStream.TYPE</code></a> and the stream's alias. |
| e.g., |
| </p> |
| <pre><code> |
| Topology t = ... |
| TStream<Integer> stream = t.poll(...).alias("myStreamControlAlias"); |
| |
| // change the poll frequency at runtime |
| static <T> void setPollFrequency(TStream<T> pollStream, long period, TimeUnit unit) { |
| ControlService cs = t.getRuntimeServiceSupplier().getService(ControlService.class); |
| String alias = pollStream.getAlias(); |
| PeriodMXBean control = cs.getControl(TStream.TYPE, alias, PeriodMXBean.class); |
| control.setPoll(period, unit); |
| } |
| </code></pre></div> |
| <dl> |
| <dt><span class="paramLabel">Type Parameters:</span></dt> |
| <dd><code>T</code> - Tuple type</dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>data</code> - Function that produces that data for the stream.</dd> |
| <dd><code>period</code> - Approximate period {code data.get()} will be called.</dd> |
| <dd><code>unit</code> - Time unit of <code>period</code>.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>New stream containing the tuples returned by <code>data.get()</code>.</dd> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="doc-files/sources.html">Edgent Source Streams</a></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="events-org.apache.edgent.function.Consumer-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>events</h4> |
| <pre><T> <a href="../../../../org/apache/edgent/topology/TStream.html" title="interface in org.apache.edgent.topology">TStream</a><T> events(<a href="../../../../org/apache/edgent/function/Consumer.html" title="interface in org.apache.edgent.function">Consumer</a><<a href="../../../../org/apache/edgent/function/Consumer.html" title="interface in org.apache.edgent.function">Consumer</a><T>> eventSetup)</pre> |
| <div class="block">Declare a stream populated by an event system. At startup |
| <code>eventSetup.accept(eventSubmitter))</code> is called by the runtime with |
| <code>eventSubmitter</code> being a <code>Consumer<T></code>. Calling |
| <code>eventSubmitter.accept(t)</code> results in <code>t</code> being present on |
| the returned stream if it is not null. If <code>t</code> is null then no |
| action is taken. <BR> |
| It is expected that <code>eventSubmitter</code> is called from the event |
| handler callback registered with the event system. |
| <P> |
| Downstream processing is isolated from the event source |
| to ensure that event listener is not blocked by a long |
| or slow processing flow. |
| </P> |
| <p> |
| If <code>eventSetup</code> implements <code>AutoCloseable</code>, its <code>close()</code> |
| method will be called when the topology's execution is terminated. |
| </P></div> |
| <dl> |
| <dt><span class="paramLabel">Type Parameters:</span></dt> |
| <dd><code>T</code> - Tuple type</dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>eventSetup</code> - handler to receive the <code>eventSubmitter</code></dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>New stream containing the tuples added by <code>eventSubmitter.accept(t)</code>.</dd> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../org/apache/edgent/topology/plumbing/PlumbingStreams.html#pressureReliever-org.apache.edgent.topology.TStream-org.apache.edgent.function.Function-int-"><code>PlumbingStreams.pressureReliever(TStream, org.apache.edgent.function.Function, int)</code></a>, |
| <a href="doc-files/sources.html">Edgent Source Streams</a></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="strings-java.lang.String...-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>strings</h4> |
| <pre><a href="../../../../org/apache/edgent/topology/TStream.html" title="interface in org.apache.edgent.topology">TStream</a><java.lang.String> strings(java.lang.String... strings)</pre> |
| <div class="block">Declare a stream of strings.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>strings</code> - Strings that will be present on the stream.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>Stream containing all values in <code>strings</code>.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="of-java.lang.Object:A-"> |
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| </a><a name="of-T...-"> |
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| <h4>of</h4> |
| <pre><T> <a href="../../../../org/apache/edgent/topology/TStream.html" title="interface in org.apache.edgent.topology">TStream</a><T> of(T... values)</pre> |
| <div class="block">Declare a stream of objects.</div> |
| <dl> |
| <dt><span class="paramLabel">Type Parameters:</span></dt> |
| <dd><code>T</code> - Tuple type</dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>values</code> - Values that will be present on the stream.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>Stream containing all values in <code>values</code>.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="collection-java.util.Collection-"> |
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| <h4>collection</h4> |
| <pre><T> <a href="../../../../org/apache/edgent/topology/TStream.html" title="interface in org.apache.edgent.topology">TStream</a><T> collection(java.util.Collection<T> tuples)</pre> |
| <div class="block">Declare a stream of constants from a collection. |
| The returned stream will contain all the tuples in <code>tuples</code>.</div> |
| <dl> |
| <dt><span class="paramLabel">Type Parameters:</span></dt> |
| <dd><code>T</code> - Tuple type</dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>tuples</code> - Tuples that will be present on the stream.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>Stream containing all values in <code>tuples</code>.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="getTester--"> |
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| </a> |
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| <h4>getTester</h4> |
| <pre><a href="../../../../org/apache/edgent/topology/tester/Tester.html" title="interface in org.apache.edgent.topology.tester">Tester</a> getTester()</pre> |
| <div class="block">Get the tester for this topology.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>tester for this topology.</dd> |
| </dl> |
| </li> |
| </ul> |
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| <h4>graph</h4> |
| <pre><a href="../../../../org/apache/edgent/graph/Graph.html" title="interface in org.apache.edgent.graph">Graph</a> graph()</pre> |
| <div class="block">Get the underlying graph.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the underlying graph.</dd> |
| </dl> |
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| <h4>getRuntimeServiceSupplier</h4> |
| <pre><a href="../../../../org/apache/edgent/function/Supplier.html" title="interface in org.apache.edgent.function">Supplier</a><<a href="../../../../org/apache/edgent/execution/services/RuntimeServices.html" title="interface in org.apache.edgent.execution.services">RuntimeServices</a>> getRuntimeServiceSupplier()</pre> |
| <div class="block">Return a function that at execution time |
| will return a <a href="../../../../org/apache/edgent/execution/services/RuntimeServices.html" title="interface in org.apache.edgent.execution.services"><code>RuntimeServices</code></a> instance |
| a stream function can use.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>Function that at execution time |
| will return a <a href="../../../../org/apache/edgent/execution/services/RuntimeServices.html" title="interface in org.apache.edgent.execution.services"><code>RuntimeServices</code></a> instance</dd> |
| </dl> |
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