org.apache.flume.channel.file.FlumeEvent.java Source code

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Here is the source code for org.apache.flume.channel.file.FlumeEvent.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 org.apache.flume.channel.file;

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

import org.apache.flume.Event;
import org.apache.hadoop.io.MapWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.io.Writable;

import com.google.common.collect.Maps;

/**
 * Persistable wrapper for Event
 */
class FlumeEvent implements Event, Writable {

    private Map<String, String> headers;
    private byte[] body;

    private FlumeEvent() {
        this(null, null);
    }

    FlumeEvent(Map<String, String> headers, byte[] body) {
        this.headers = headers;
        this.body = body;
    }

    @Override
    public Map<String, String> getHeaders() {
        return headers;
    }

    @Override
    public void setHeaders(Map<String, String> headers) {
        this.headers = headers;
    }

    @Override
    public byte[] getBody() {
        return body;
    }

    @Override
    public void setBody(byte[] body) {
        this.body = body;
    }

    @Override
    public void write(DataOutput out) throws IOException {
        MapWritable map = toMapWritable(getHeaders());
        map.write(out);
        byte[] body = getBody();
        if (body == null) {
            out.writeInt(-1);
        } else {
            out.writeInt(body.length);
            out.write(body);
        }
    }

    @Override
    public void readFields(DataInput in) throws IOException {
        MapWritable map = new MapWritable();
        map.readFields(in);
        setHeaders(fromMapWritable(map));
        byte[] body = null;
        int bodyLength = in.readInt();
        if (bodyLength != -1) {
            body = new byte[bodyLength];
            in.readFully(body);
        }
        setBody(body);
    }

    private MapWritable toMapWritable(Map<String, String> map) {
        MapWritable result = new MapWritable();
        if (map != null) {
            for (Map.Entry<String, String> entry : map.entrySet()) {
                result.put(new Text(entry.getKey()), new Text(entry.getValue()));
            }
        }
        return result;
    }

    private Map<String, String> fromMapWritable(MapWritable map) {
        Map<String, String> result = Maps.newHashMap();
        if (map != null) {
            for (Map.Entry<Writable, Writable> entry : map.entrySet()) {
                result.put(entry.getKey().toString(), entry.getValue().toString());
            }
        }
        return result;
    }

    static FlumeEvent from(DataInput in) throws IOException {
        FlumeEvent event = new FlumeEvent();
        event.readFields(in);
        return event;
    }
}