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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-2182) Add stateful Streaming Sequence Source
Date Mon, 08 Jun 2015 13:00:01 GMT

    [ https://issues.apache.org/jira/browse/FLINK-2182?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14577135#comment-14577135
] 

ASF GitHub Bot commented on FLINK-2182:
---------------------------------------

Github user mbalassi commented on a diff in the pull request:

    https://github.com/apache/flink/pull/804#discussion_r31910945
  
    --- Diff: flink-staging/flink-streaming/flink-streaming-core/src/main/java/org/apache/flink/streaming/api/functions/source/StatefulSequenceSource.java
---
    @@ -0,0 +1,88 @@
    +/**
    + * Licensed to the Apache Software Foundation (ASF) under one
    + * or more contributor license agreements.  See the NOTICE file
    + * distributed with this work for additional information
    + * regarding copyright ownership.  The ASF licenses this file
    + * to you under the Apache License, Version 2.0 (the
    + * "License"); you may not use this file except in compliance
    + * with the License.  You may obtain a copy of the License at
    + *
    + * http://www.apache.org/licenses/LICENSE-2.0
    + *
    + * Unless required by applicable law or agreed to in writing, software
    + * distributed under the License is distributed on an "AS IS" BASIS,
    + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    + * See the License for the specific language governing permissions and
    + * limitations under the License.
    + */
    +package org.apache.flink.streaming.api.functions.source;
    +
    +
    +import org.apache.flink.streaming.api.checkpoint.Checkpointed;
    +import org.apache.flink.streaming.runtime.tasks.StreamingRuntimeContext;
    +
    +/**
    + * A stateful streaming source that emits each number from a given interval exactly once,
    + * possibly in parallel.
    + */
    +public class StatefulSequenceSource extends RichParallelSourceFunction<Long> implements
Checkpointed<Long> {
    +	private static final long serialVersionUID = 1L;
    +
    +	private final long start;
    +	private final long end;
    +
    +	private long collected;
    +
    +	private volatile boolean isRunning = true;
    +
    +	/**
    +	 * Creates a source that emits all numbers from the given interval exactly once.
    +	 *
    +	 * @param start Start of the range of numbers to emit.
    +	 * @param end End of the range of numbers to emit.
    +	 */
    +	public StatefulSequenceSource(long start, long end) {
    +		this.start = start;
    +		this.end = end;
    +		this.collected = 0;
    +	}
    +
    +	@Override
    +	public void run(SourceContext<Long> ctx) throws Exception {
    +		final Object checkpointLock = ctx.getCheckpointLock();
    +
    +		StreamingRuntimeContext context = (StreamingRuntimeContext) getRuntimeContext();
    +
    --- End diff --
    
    We can get away with not casting this, nothing streaming specific is used.


> Add stateful Streaming Sequence Source
> --------------------------------------
>
>                 Key: FLINK-2182
>                 URL: https://issues.apache.org/jira/browse/FLINK-2182
>             Project: Flink
>          Issue Type: Improvement
>          Components: eaming, Streaming
>            Reporter: Aljoscha Krettek
>            Assignee: Aljoscha Krettek
>            Priority: Minor
>




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