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| <h1>sink</h1><span class="permalink"> |
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| <ol><li name="org.apache.gearpump.streaming.sink.DataSink" visbl="pub" data-isabs="true" fullComment="yes" group="Ungrouped"> |
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| <a href="DataSink.html"><span class="name">DataSink</span></a><span class="result"> extends <span class="extype" name="java.io.Serializable">Serializable</span></span> |
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| <p class="shortcomment cmt">Interface to implement custom data sink where result of a DAG is typically written |
| a DataSink could be a data store like HBase or simply a console</p><div class="fullcomment"><div class="comment cmt"><p>Interface to implement custom data sink where result of a DAG is typically written |
| a DataSink could be a data store like HBase or simply a console</p><p>An example would be like:</p><pre><span class="kw">class</span> ConsoleSink <span class="kw">extends</span> DataSink[<span class="std">String</span>] { |
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| <span class="kw">def</span> open(context: TaskContext): <span class="std">Unit</span> = {} |
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| <span class="kw">def</span> write(s: <span class="std">String</span>): <span class="std">Unit</span> = { |
| <span class="std">Console</span>.println(s) |
| } |
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| <span class="kw">def</span> close(): <span class="std">Unit</span> = {} |
| }</pre><p>Subclass is required to be serializable |
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| <a href="DataSinkTask.html"><span class="name">DataSinkTask</span></a><span class="result"> extends <a href="../task/Task.html" class="extype" name="org.apache.gearpump.streaming.task.Task">Task</a></span> |
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| <p class="shortcomment cmt">General task that runs any <a href="DataSink.html" class="extype" name="org.apache.gearpump.streaming.sink.DataSink">DataSink</a> |
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| <p class="shortcomment cmt">Utility that helps user to create a DAG ending in <a href="DataSink.html" class="extype" name="org.apache.gearpump.streaming.sink.DataSink">DataSink</a> |
| user should pass in a <a href="DataSink.html" class="extype" name="org.apache.gearpump.streaming.sink.DataSink">DataSink</a>.</p><div class="fullcomment"><div class="comment cmt"><p>Utility that helps user to create a DAG ending in <a href="DataSink.html" class="extype" name="org.apache.gearpump.streaming.sink.DataSink">DataSink</a> |
| user should pass in a <a href="DataSink.html" class="extype" name="org.apache.gearpump.streaming.sink.DataSink">DataSink</a>.</p><p>here is an example to build a DAG that does word count and write to KafkaSink</p><pre><span class="kw">val</span> split = Processor[Split](<span class="num">1</span>) |
| <span class="kw">val</span> sum = Processor[Sum](<span class="num">1</span>) |
| <span class="kw">val</span> sink = <span class="kw">new</span> KafkaSink() |
| <span class="kw">val</span> sinkProcessor = DataSinkProcessor(sink, <span class="num">1</span>) |
| <span class="kw">val</span> dag = split ~> sum ~> sink</pre></div></div> |
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