org.apache.tez.test.TestOutput.java Source code

Introduction

Here is the source code for org.apache.tez.test.TestOutput.java

Source

/**
* 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.tez.test;

import java.nio.ByteBuffer;
import java.util.Collections;
import java.util.List;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.tez.dag.api.OutputDescriptor;
import org.apache.tez.dag.api.UserPayload;
import org.apache.tez.runtime.api.AbstractLogicalOutput;
import org.apache.tez.runtime.api.Event;
import org.apache.tez.runtime.api.OutputContext;
import org.apache.tez.runtime.api.Writer;
import org.apache.tez.runtime.api.events.DataMovementEvent;

import com.google.common.collect.Lists;

public class TestOutput extends AbstractLogicalOutput {
    private static final Log LOG = LogFactory.getLog(TestOutput.class);

    public TestOutput(OutputContext outputContext, int numPhysicalOutputs) {
        super(outputContext, numPhysicalOutputs);
    }

    public static OutputDescriptor getOutputDesc(UserPayload payload) {
        OutputDescriptor desc = OutputDescriptor.create(TestOutput.class.getName());
        if (payload != null) {
            desc.setUserPayload(payload);
        }
        return desc;
    }

    int output;

    @Override
    public List<Event> initialize() throws Exception {
        getContext().requestInitialMemory(0l, null); //Mandatory call
        return Collections.emptyList();
    }

    void write(int value) {
        this.output = value;
    }

    @Override
    public void start() {
    }

    @Override
    public Writer getWriter() throws Exception {
        return null;
    }

    @Override
    public void handleEvents(List<Event> outputEvents) {
    }

    @Override
    public List<Event> close() throws Exception {
        LOG.info("Sending data movement event with value: " + output);
        ByteBuffer result = ByteBuffer.allocate(4).putInt(output);
        result.flip();
        List<Event> events = Lists.newArrayListWithCapacity(getNumPhysicalOutputs());
        for (int i = 0; i < getNumPhysicalOutputs(); i++) {
            DataMovementEvent event = DataMovementEvent.create(i, result);
            events.add(event);
        }
        return events;
    }

}