org.apache.tez.runtime.api.impl.GroupInputSpec.java Source code

Introduction

Here is the source code for org.apache.tez.runtime.api.impl.GroupInputSpec.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.runtime.api.impl;

import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import java.util.List;

import org.apache.hadoop.io.Text;
import org.apache.hadoop.io.Writable;
import org.apache.hadoop.util.StringInterner;
import org.apache.tez.dag.api.InputDescriptor;

import com.google.common.collect.Lists;

public class GroupInputSpec implements Writable {

    private String groupName;
    private List<String> groupVertices;
    private InputDescriptor mergedInputDescriptor;

    public GroupInputSpec() {
        // for Writable
    }

    public String getGroupName() {
        return groupName;
    }

    public List<String> getGroupVertices() {
        return groupVertices;
    }

    public InputDescriptor getMergedInputDescriptor() {
        return mergedInputDescriptor;
    }

    public GroupInputSpec(String groupName, List<String> groupVertices, InputDescriptor inputDescriptor) {
        this.groupName = StringInterner.weakIntern(groupName);
        this.groupVertices = groupVertices;
        this.mergedInputDescriptor = inputDescriptor;
    }

    @Override
    public void write(DataOutput out) throws IOException {
        Text.writeString(out, groupName);
        out.writeInt(groupVertices.size());
        for (String s : groupVertices) {
            Text.writeString(out, s);
        }
        mergedInputDescriptor.write(out);
    }

    @Override
    public void readFields(DataInput in) throws IOException {
        groupName = StringInterner.weakIntern(Text.readString(in));
        int numMembers = in.readInt();
        groupVertices = Lists.newArrayListWithCapacity(numMembers);
        for (int i = 0; i < numMembers; ++i) {
            groupVertices.add(StringInterner.weakIntern(Text.readString(in)));
        }
        mergedInputDescriptor = new InputDescriptor();
        mergedInputDescriptor.readFields(in);
    }

    @Override
    public String toString() {
        StringBuffer sb = new StringBuffer();
        sb.append("Group: " + groupName + " { ");
        for (String s : groupVertices) {
            sb.append(s + " ");
        }
        sb.append("} MergedInputDescriptor: " + mergedInputDescriptor.getClassName());
        return sb.toString();
    }

}