/**
* 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.text.output;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Map.Entry;
import org.codehaus.jackson.JsonEncoding;
import org.codehaus.jackson.JsonFactory;
import org.codehaus.jackson.JsonGenerator;
import com.cloudera.flume.core.Event;
import com.cloudera.flume.core.EventImpl;
import com.cloudera.flume.handlers.text.FormatFactory.OutputFormatBuilder;
import com.google.common.base.Preconditions;
/**
* This uses Jackson to output Flume events as json.
*/
public class JsonOutputFormat extends AbstractOutputFormat {
private static final String NAME = "json";
private final JsonFactory jsonFactory = new JsonFactory();
public JsonOutputFormat() {
}
@Override
public void format(OutputStream o, Event e) throws IOException {
JsonGenerator g = jsonFactory.createJsonGenerator(o, JsonEncoding.UTF8);
g.writeStartObject();
g.writeStringField("body", new String(e.getBody()));
g.writeNumberField("timestamp", e.getTimestamp());
g.writeStringField("pri", e.getPriority().toString());
g.writeNumberField("nanos", e.getNanos());
g.writeStringField("host", e.getHost());
g.writeObjectFieldStart("fields");
for (Entry<String, byte[]> a : e.getAttrs().entrySet()) {
g.writeStringField(a.getKey(), new String(a.getValue()));
}
g.writeEndObject();
g.writeEndObject();
g.writeRaw('\n');
g.flush();
}
public static OutputFormatBuilder builder() {
return new OutputFormatBuilder() {
@Override
public OutputFormat build(String... args) {
Preconditions.checkArgument(args.length == 0, "usage: json");
OutputFormat format = new JsonOutputFormat();
format.setBuilder(this);
return format;
}
@Override
public String getName() {
return NAME;
}
};
}
}