/**
* 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.rpc;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.cloudera.flume.conf.Context;
import com.cloudera.flume.conf.FlumeConfiguration;
import com.cloudera.flume.conf.SourceFactory.SourceBuilder;
import com.cloudera.flume.core.EventSink;
import com.cloudera.flume.core.EventSource;
import com.cloudera.flume.handlers.avro.AvroEventSource;
import com.cloudera.flume.handlers.thrift.ThriftEventSource;
import com.google.common.base.Preconditions;
/**
* This is a source that sends events through a RPC, it either uses Avro or
* Thrift depending upon the EVENT_RPC_TYPE set in the configuration file.
*/
public class RpcSource extends EventSink.Base {
public static final Logger LOG = LoggerFactory.getLogger(RpcSource.class);
/**
* This class will build an AvroEventSource or ThriftEventSource depending on
* the value of EVENT_RPC_TYPE set in the configuration file.
*/
public static SourceBuilder builder() {
return new SourceBuilder() {
@Override
public EventSource build(Context ctx, String... argv) {
Preconditions.checkArgument(argv.length == 1, "usage: rpcSource(port)");
int port = Integer.parseInt(argv[0]);
/*
* I am hoping here that master calls this builder and at that time the
* FlumeConfiguration is all set.
*/
if (FlumeConfiguration.get().getEventRPC().equals(
FlumeConfiguration.RPC_TYPE_THRIFT)) {
return new ThriftEventSource(port);
}
if (FlumeConfiguration.get().getEventRPC().equals(
FlumeConfiguration.RPC_TYPE_AVRO)) {
return new AvroEventSource(port);
}
LOG.warn("event.rpc.type not defined. It should be either "
+ "\"THRIFT\" or \"AVRO\". Defaulting to Thrift");
return new ThriftEventSource(port);
}
};
}
}