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| <p class="subTitle">io.gearpump.streaming.source</p> |
| <h2 title="Interface DataSource" class="title">Interface DataSource</h2> |
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| <dt>All Superinterfaces:</dt> |
| <dd>java.io.Serializable</dd> |
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| <dt>All Known Subinterfaces:</dt> |
| <dd><a href="../../../../io/gearpump/streaming/transaction/api/TimeReplayableSource.html" title="interface in io.gearpump.streaming.transaction.api">TimeReplayableSource</a></dd> |
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| <dt>All Known Implementing Classes:</dt> |
| <dd><a href="../../../../io/gearpump/streaming/dsl/CollectionDataSource.html" title="class in io.gearpump.streaming.dsl">CollectionDataSource</a></dd> |
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| <pre>public interface <strong>DataSource</strong> |
| extends java.io.Serializable</pre> |
| <div class="block">interface to implement custom source where data is read into the system. |
| a DataSource could be a message queue like kafka or simply data generation source. |
| <p> |
| an example would be like |
| <pre><code> |
| GenStringSource extends DataSource { |
| |
| def open(context: TaskContext, startTime: Option[TimeStamp]): Unit = {} |
| |
| def read(batchSize: Int): List[Message] = { |
| List.fill(batchSize)(Message("message")) |
| } |
| |
| def close(): Unit = {} |
| } |
| </code></pre> |
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| subclass is required to be serializable</div> |
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| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><strong><a href="../../../../io/gearpump/streaming/source/DataSource.html#close()">close</a></strong>()</code> |
| <div class="block">close connection to data source.</div> |
| </td> |
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| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><strong><a href="../../../../io/gearpump/streaming/source/DataSource.html#open(io.gearpump.streaming.task.TaskContext, scala.Option)">open</a></strong>(<a href="../../../../io/gearpump/streaming/task/TaskContext.html" title="interface in io.gearpump.streaming.task">TaskContext</a> context, |
| scala.Option<java.lang.Object> startTime)</code> |
| <div class="block">open connection to data source |
| invoked in onStart() method of <a href="../../../../io/gearpump/streaming/source/DataSourceTask.html" title="class in io.gearpump.streaming.source"><code>DataSourceTask</code></a></div> |
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| <td class="colFirst"><code>scala.collection.immutable.List<io.gearpump.Message></code></td> |
| <td class="colLast"><code><strong><a href="../../../../io/gearpump/streaming/source/DataSource.html#read(int)">read</a></strong>(int batchSize)</code> |
| <div class="block">read a number of messages from data source.</div> |
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| <h4>open</h4> |
| <pre>void open(<a href="../../../../io/gearpump/streaming/task/TaskContext.html" title="interface in io.gearpump.streaming.task">TaskContext</a> context, |
| scala.Option<java.lang.Object> startTime)</pre> |
| <div class="block">open connection to data source |
| invoked in onStart() method of <a href="../../../../io/gearpump/streaming/source/DataSourceTask.html" title="class in io.gearpump.streaming.source"><code>DataSourceTask</code></a></div> |
| <dl><dt><span class="strong">Parameters:</span></dt><dd><code>context</code> - is the task context at runtime</dd><dd><code>startTime</code> - is the start time of system</dd></dl> |
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| <h4>read</h4> |
| <pre>scala.collection.immutable.List<io.gearpump.Message> read(int batchSize)</pre> |
| <div class="block">read a number of messages from data source. |
| invoked in each onNext() method of <a href="../../../../io/gearpump/streaming/source/DataSourceTask.html" title="class in io.gearpump.streaming.source"><code>DataSourceTask</code></a></div> |
| <dl><dt><span class="strong">Parameters:</span></dt><dd><code>batchSize</code> - max number of messages to read</dd> |
| <dt><span class="strong">Returns:</span></dt><dd>a list of messages wrapped in <code>Message</code></dd></dl> |
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| <h4>close</h4> |
| <pre>void close()</pre> |
| <div class="block">close connection to data source. |
| invoked in onStop() method of <a href="../../../../io/gearpump/streaming/source/DataSourceTask.html" title="class in io.gearpump.streaming.source"><code>DataSourceTask</code></a></div> |
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