blob: 13ce5f48dc0fb45a78c0724bc4c0488393055bde [file] [log] [blame]
/*
* 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.samza.task;
import org.apache.samza.config.Config;
import org.apache.samza.context.Context;
import org.apache.samza.system.IncomingMessageEnvelope;
import org.apache.samza.system.OutgoingMessageEnvelope;
import org.apache.samza.system.SystemStream;
public class IdentityStreamTask implements StreamTask, InitableTask {
private int processedMessageCount = 0;
private int expectedMessageCount;
private String outputTopic;
private String outputSystem;
@Override
public void init(Context context) throws Exception {
Config config = context.getJobContext().getConfig();
this.expectedMessageCount = config.getInt("app.messageCount");
this.outputTopic = config.get("app.outputTopic", "output");
this.outputSystem = config.get("app.outputSystem", "test-system");
}
@Override
public void process(
IncomingMessageEnvelope incomingMessageEnvelope,
MessageCollector messageCollector,
TaskCoordinator taskCoordinator) throws Exception {
messageCollector.send(
new OutgoingMessageEnvelope(
new SystemStream(outputSystem, outputTopic),
incomingMessageEnvelope.getMessage()));
processedMessageCount++;
if (processedMessageCount == expectedMessageCount) {
taskCoordinator.shutdown(TaskCoordinator.RequestScope.ALL_TASKS_IN_CONTAINER);
}
}
}