/**
* 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.io.IOException;
import org.apache.thrift.TException;
import org.apache.thrift.protocol.TBinaryProtocol;
import org.apache.thrift.protocol.TProtocol;
import org.apache.thrift.transport.TFramedTransport;
import org.apache.thrift.transport.TSocket;
import org.apache.thrift.transport.TTransport;
import org.apache.thrift.transport.TTransportException;
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.SinkFactory.SinkBuilder;
import com.cloudera.flume.core.Event;
import com.cloudera.flume.core.EventImpl;
import com.cloudera.flume.core.EventSink;
import com.cloudera.flume.handlers.thrift.ThriftFlumeEventServer.Client;
/**
* This is a sink that sends events to a remote host/port. The event append rpc
* has a return value so this is stop-and-wait (now sliding window). This
* however is the simplest way to get network backpressure that does not
* overwhelm the receiver.
*/
public class ThriftAckedEventSink extends EventSink.Base {
static final Logger LOG = LoggerFactory.getLogger(ThriftAckedEventSink.class);
String host;
int port;
Client client;
TTransport transport;
boolean nonblocking;
public ThriftAckedEventSink(String host, int port, boolean nonblocking) {
this.host = host;
this.port = port;
this.nonblocking = nonblocking;
}
public ThriftAckedEventSink(String host, int port) {
this(host, port, false);
}
@Override
public void append(Event e) throws IOException, InterruptedException {
ThriftFlumeEvent tfe = ThriftEventAdaptor.convert(e);
try {
EventStatus res = client.ackedAppend(tfe);
super.append(e);
if (res == EventStatus.ACK || res == EventStatus.COMMITED) {
return;
}
throw new IOException(
"Append return withs ERR status (received by dropped)");
} catch (TException e1) {
e1.printStackTrace();
throw new IOException("Append failed " + e);
}
}
@Override
public void close() throws IOException {
if (transport != null) {
transport.close();
transport = null;
LOG.info("ThriftEventSink on port " + port + " closed");
}
}
@Override
public void open() throws IOException {
try {
if (nonblocking) {
// non blocking must use "Framed transport"
transport = new TSocket(host, port);
transport = new TFramedTransport(transport);
} else {
transport = new TSocket(host, port);
}
TProtocol protocol = new TBinaryProtocol(transport);
transport.open();
client = new Client(protocol);
LOG.info("ThriftEventSink open on port " + port + " opened");
} catch (TTransportException e) {
e.printStackTrace();
throw new IOException("Failed to open thrift event sink at " + host + ":"
+ port + " : " + e);
}
}
public static void main(String argv[]) {
FlumeConfiguration conf = FlumeConfiguration.get();
ThriftAckedEventSink sink = new ThriftAckedEventSink("localhost", conf
.getCollectorPort());
try {
sink.open();
for (int i = 0; i < 100; i++) {
Event e = new EventImpl(("This is a test " + i).getBytes());
sink.append(e);
Thread.sleep(200);
}
} catch (IOException e) {
e.printStackTrace();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
public static SinkBuilder builder() {
return new SinkBuilder() {
@Override
public EventSink build(Context context, String... args) {
if (args.length > 2) {
throw new IllegalArgumentException(
"usage: thrift([hostname, [portno]]) ");
}
String host = FlumeConfiguration.get().getCollectorHost();
int port = FlumeConfiguration.get().getCollectorPort();
if (args.length >= 1) {
host = args[0];
}
if (args.length >= 2) {
port = Integer.parseInt(args[1]);
}
return new ThriftAckedEventSink(host, port);
}
};
}
}