package com.linkedin.databus2.tools.dtail;
/*
*
* Copyright 2013 LinkedIn Corp. All rights reserved
*
* Licensed 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.
*
*/
import java.io.IOException;
import java.io.OutputStream;
import java.util.HashMap;
import org.apache.avro.Schema;
import org.apache.avro.generic.GenericDatumWriter;
import org.apache.avro.generic.GenericRecord;
import org.apache.avro.io.JsonEncoder;
import org.apache.log4j.Logger;
import com.linkedin.databus.client.DatabusHttpClientImpl;
import com.linkedin.databus.client.pub.ConsumerCallbackResult;
/**
* An event printer using the standard Avro JSON serialization.
* */
public class AvroJsonDtailPrinter extends GenericRecordDtailPrinter
{
public static final Logger LOG = Logger.getLogger(AvroJsonDtailPrinter.class);
private final HashMap<Schema, GenericDatumWriter<GenericRecord>> _jsonWriters;
private final HashMap<Schema, JsonEncoder> _jsonEncoders;
public AvroJsonDtailPrinter(DatabusHttpClientImpl client, StaticConfig conf, OutputStream out)
{
this(client, conf, out, MetadataOutput.NONE);
}
public AvroJsonDtailPrinter(DatabusHttpClientImpl client, StaticConfig conf, OutputStream out,
MetadataOutput metadata)
{
super(client, conf, out, metadata);
_jsonWriters = new HashMap<Schema, GenericDatumWriter<GenericRecord>>(5);
_jsonEncoders = new HashMap<Schema, JsonEncoder>(5);
}
/**
* @see com.linkedin.databus2.tools.dtail.GenericRecordDtailPrinter#printGenericRecord(org.apache.avro.generic.GenericRecord)
*/
@Override
public ConsumerCallbackResult printGenericRecord(GenericRecord r)
{
ConsumerCallbackResult result = ConsumerCallbackResult.SUCCESS;
try
{
//eventDecoder.dumpEventValueInJSON(e, _out);
JsonEncoder jsonEnc = _jsonEncoders.get(r.getSchema());
if (null == jsonEnc)
{
jsonEnc = new JsonEncoder(r.getSchema(), _out);
_jsonEncoders.put(r.getSchema(), jsonEnc);
}
GenericDatumWriter<GenericRecord> datumWriter = _jsonWriters.get(r.getSchema());
if (null == datumWriter)
{
datumWriter = new GenericDatumWriter<GenericRecord>(r.getSchema());
_jsonWriters.put(r.getSchema(), datumWriter);
}
datumWriter.write(r, jsonEnc);
jsonEnc.flush();
_out.write('\n');
}
catch (RuntimeException re)
{
LOG.error("event dump error: " + re.getMessage(), re);
result = ConsumerCallbackResult.ERROR;
}
catch (IOException ioe)
{
LOG.error("event dump error: " + ioe.getMessage(), ioe);
result = ConsumerCallbackResult.ERROR;
}
return result;
}
}