org.apache.flume.channel.recoverable.memory.RecoverableMemoryChannelEvent.java Source code

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Here is the source code for org.apache.flume.channel.recoverable.memory.RecoverableMemoryChannelEvent.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.recoverable.memory;

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

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

import com.google.common.collect.Maps;

class RecoverableMemoryChannelEvent implements Event, Writable {
    Event event;
    long sequenceId;

    // called via reflection
    @SuppressWarnings("unused")
    private RecoverableMemoryChannelEvent() {
        this.event = new SimpleEvent();
    }

    RecoverableMemoryChannelEvent(Event event, long sequenceId) {
        this.event = event;
        this.sequenceId = sequenceId;
    }

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

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

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

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

    @Override
    public void write(DataOutput out) throws IOException {
        out.writeLong(sequenceId);
        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 {
        sequenceId = in.readLong();
        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;
    }
}