com.chinamobile.bcbsp.io.titan.TitanOutputFormat.java Source code

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Here is the source code for com.chinamobile.bcbsp.io.titan.TitanOutputFormat.java

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/*
 * 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 com.chinamobile.bcbsp.io.titan;

import java.io.IOException;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.Text;

import com.chinamobile.bcbsp.io.OutputFormat;
import com.chinamobile.bcbsp.io.RecordWriter;
import com.chinamobile.bcbsp.util.BSPJob;
import com.chinamobile.bcbsp.util.StaffAttemptID;
import com.tinkerpop.rexster.client.RexsterClient;
import com.tinkerpop.rexster.client.RexsterClientFactory;

/**
 * TitanOutputFormat implements the write strategy for BSP system to Titan
 * database.
 * @author Zhicheng Liu 2013/4/25
 */
public class TitanOutputFormat extends OutputFormat<Text, Text> {
    /**log handle in outputformat class*/
    private static final Log LOG = LogFactory.getLog(TitanOutputFormat.class);
    /**Titan client*/
    private RexsterClient client;
    /**configuration handle*/
    private Configuration conf;

    /**
     * construct method
     */
    public TitanOutputFormat() {
    }

    @Override
    public RecordWriter<Text, Text> getRecordWriter(BSPJob job, StaffAttemptID staffID, Path path)
            throws IOException, InterruptedException {
        return new TitanRecordWriter(client);
    }

    @Override
    public RecordWriter<Text, Text> getRecordWriter(BSPJob job, StaffAttemptID staffID)
            throws IOException, InterruptedException {
        return new TitanRecordWriter(client);
    }

    @Override
    public void initialize(Configuration configuration) {
        conf = new Configuration(configuration);
        conf.set("TITAN_SERVER_ADDRESS", configuration.get("titan.server.address", "localhost"));
        conf.set("TITAN_OUTPUT_TABLE_NAME", configuration.get("titan.output.table.name", "graph"));
        conf.set("HBASE_MASTER_ADDRESS", configuration.get("hbase.master.address", "localhost"));
        conf.set("HBASE_OUTPUT_TABLE_NAME", configuration.get("hbase.output.table.name", "titan"));
        try {
            client = RexsterClientFactory.open(conf.get("TITAN_SERVER_ADDRESS"),
                    conf.get("TITAN_OUTPUT_TABLE_NAME"));
        } catch (Exception e) {
            LOG.error("The client of database can not obtain!");
            return;
        }
    }
}