com.cloudera.flume.handlers.thrift.ThriftEventAdaptor.java Source code

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Here is the source code for com.cloudera.flume.handlers.thrift.ThriftEventAdaptor.java

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/**
 * Licensed to Cloudera, Inc. under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  Cloudera, Inc. 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.cloudera.flume.handlers.thrift;

import java.nio.ByteBuffer;
import java.util.Collections;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;

import org.apache.commons.lang.NotImplementedException;
import org.apache.commons.lang.StringEscapeUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.cloudera.flume.core.Event;
import com.google.common.base.Preconditions;

/**
 * This wraps a Thrift generated ThriftFlumeEvent with a Flume Event interface.
 * 
 * This should only be used by the ThriftEventSink, ThriftEventSource, and
 * ThriftFlumeEventServerImpl. Its constructor, and static conversion function
 * are purposely package protected.
 */
class ThriftEventAdaptor extends Event {
    public static final Logger LOG = LoggerFactory.getLogger(ThriftEventAdaptor.class);
    ThriftFlumeEvent evt;

    ThriftEventAdaptor(ThriftFlumeEvent evt) {
        super();
        Preconditions.checkArgument(evt != null, "ThriftFlumeEvent is null!");
        this.evt = evt;
    }

    @Override
    public byte[] getBody() {
        byte[] buf = evt.getBody();
        if (buf == null) {
            LOG.warn("Thrift Event had null body! " + evt);
            return new byte[0];
        }
        return buf;
    }

    @Override
    public Priority getPriority() {
        return convert(evt.getPriority());
    }

    @Override
    public long getTimestamp() {
        return evt.timestamp;
    }

    public static Priority convert(com.cloudera.flume.handlers.thrift.Priority p) {
        Preconditions.checkNotNull(p, "Prioirity argument must be valid.");

        switch (p) {
        case FATAL:
            return Priority.FATAL;
        case ERROR:
            return Priority.ERROR;
        case WARN:
            return Priority.WARN;
        case INFO:
            return Priority.INFO;
        case DEBUG:
            return Priority.DEBUG;
        case TRACE:
            return Priority.TRACE;
        default:
            throw new IllegalStateException("Unknown value " + p);
        }
    }

    public static com.cloudera.flume.handlers.thrift.Priority convert(Priority p) {
        Preconditions.checkNotNull(p, "Argument must not be null.");

        switch (p) {
        case FATAL:
            return com.cloudera.flume.handlers.thrift.Priority.FATAL;
        case ERROR:
            return com.cloudera.flume.handlers.thrift.Priority.ERROR;
        case WARN:
            return com.cloudera.flume.handlers.thrift.Priority.WARN;
        case INFO:
            return com.cloudera.flume.handlers.thrift.Priority.INFO;
        case DEBUG:
            return com.cloudera.flume.handlers.thrift.Priority.DEBUG;
        case TRACE:
            return com.cloudera.flume.handlers.thrift.Priority.TRACE;
        default:
            throw new IllegalStateException("Unknown value " + p);
        }
    }

    @Override
    public String toString() {
        String mbody = StringEscapeUtils.escapeJava(new String(getBody()));
        return "[" + getPriority().toString() + " " + new Date(getTimestamp()) + "] " + mbody;
    }

    @Override
    public long getNanos() {
        return evt.getNanos();
    }

    @Override
    public String getHost() {
        return evt.getHost();
    }

    /**
     * This makes a thrift compatible copy of the event. It is here to encapsulate
     * future changes to the Event/ThriftFlumeEvent interface
     */
    public static ThriftFlumeEvent convert(Event e) {
        ThriftFlumeEvent evt = new ThriftFlumeEvent();
        evt.timestamp = e.getTimestamp();
        evt.priority = convert(e.getPriority());
        ByteBuffer buf = ByteBuffer.wrap(e.getBody());
        evt.body = buf;
        evt.nanos = e.getNanos();
        evt.host = e.getHost();

        Map<String, byte[]> tempMap = e.getAttrs();
        Map<String, ByteBuffer> returnMap = new HashMap<String, ByteBuffer>();
        for (String key : tempMap.keySet()) {
            buf.clear();
            buf = ByteBuffer.wrap(tempMap.get(key));
            returnMap.put(key, buf);
        }

        evt.fields = returnMap;
        return evt;
    }

    @Override
    public byte[] get(String attr) {
        Preconditions.checkNotNull(evt.fields, "Event contains no attributes");

        if (evt.fields.get(attr) == null) {
            return null;
        }

        return evt.fields.get(attr).array();
    }

    @Override
    public Map<String, byte[]> getAttrs() {
        if (evt.fields == null) {
            return Collections.<String, byte[]>emptyMap();
        }
        Map<String, ByteBuffer> tempMap = Collections.unmodifiableMap(evt.fields);
        Map<String, byte[]> returnMap = new HashMap<String, byte[]>();
        for (String key : tempMap.keySet()) {
            ByteBuffer buf = tempMap.get(key);
            returnMap.put(key, buf.array());
        }
        return Collections.unmodifiableMap(returnMap);
    }

    @Override
    public void set(String attr, byte[] vArray) {
        if (evt.fields.get(attr) != null) {
            throw new IllegalArgumentException("Event already had an event with attribute " + attr);
        }
        evt.fields.put(attr, ByteBuffer.wrap(vArray));
    }

    @Override
    public void hierarchicalMerge(String prefix, Event e) {
        throw new NotImplementedException();
    }

    @Override
    public void merge(Event e) {
        throw new NotImplementedException();
    }

}