/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF 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 org.apache.hadoop.ipc;
import org.apache.commons.logging.*;
import org.apache.hadoop.io.Writable;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.util.StringUtils;
import org.apache.hadoop.net.NetUtils;
import java.util.Random;
import java.io.DataInput;
import java.io.IOException;
import java.net.InetSocketAddress;
import junit.framework.TestCase;
import org.apache.hadoop.conf.Configuration;
/** Unit tests for IPC. */
public class TestIPC extends TestCase {
public static final Log LOG =
LogFactory.getLog(TestIPC.class);
final private static Configuration conf = new Configuration();
final static private int PING_INTERVAL = 1000;
static {
Client.setPingInterval(conf, PING_INTERVAL);
}
public TestIPC(String name) { super(name); }
private static final Random RANDOM = new Random();
private static final String ADDRESS = "0.0.0.0";
private static class TestServer extends Server {
private boolean sleep;
public TestServer(int handlerCount, boolean sleep)
throws IOException {
super(ADDRESS, 0, LongWritable.class, handlerCount, conf);
this.sleep = sleep;
}
@Override
public Writable call(Class<?> protocol, Writable param, long receiveTime)
throws IOException {
if (sleep) {
try {
Thread.sleep(RANDOM.nextInt(2*PING_INTERVAL)); // sleep a bit
} catch (InterruptedException e) {}
}
return param; // echo param as result
}
}
private static class SerialCaller extends Thread {
private Client client;
private InetSocketAddress server;
private int count;
private boolean failed;
public SerialCaller(Client client, InetSocketAddress server, int count) {
this.client = client;
this.server = server;
this.count = count;
}
public void run() {
for (int i = 0; i < count; i++) {
try {
LongWritable param = new LongWritable(RANDOM.nextLong());
LongWritable value =
(LongWritable)client.call(param, server, null, null);
if (!param.equals(value)) {
LOG.fatal("Call failed!");
failed = true;
break;
}
} catch (Exception e) {
LOG.fatal("Caught: " + StringUtils.stringifyException(e));
failed = true;
}
}
}
}
private static class ParallelCaller extends Thread {
private Client client;
private int count;
private InetSocketAddress[] addresses;
private boolean failed;
public ParallelCaller(Client client, InetSocketAddress[] addresses,
int count) {
this.client = client;
this.addresses = addresses;
this.count = count;
}
public void run() {
for (int i = 0; i < count; i++) {
try {
Writable[] params = new Writable[addresses.length];
for (int j = 0; j < addresses.length; j++)
params[j] = new LongWritable(RANDOM.nextLong());
Writable[] values = client.call(params, addresses, null, null);
for (int j = 0; j < addresses.length; j++) {
if (!params[j].equals(values[j])) {
LOG.fatal("Call failed!");
failed = true;
break;
}
}
} catch (Exception e) {
LOG.fatal("Caught: " + StringUtils.stringifyException(e));
failed = true;
}
}
}
}
public void testSerial() throws Exception {
testSerial(3, false, 2, 5, 100);
}
public void testSerial(int handlerCount, boolean handlerSleep,
int clientCount, int callerCount, int callCount)
throws Exception {
Server server = new TestServer(handlerCount, handlerSleep);
InetSocketAddress addr = NetUtils.getConnectAddress(server);
server.start();
Client[] clients = new Client[clientCount];
for (int i = 0; i < clientCount; i++) {
clients[i] = new Client(LongWritable.class, conf);
}
SerialCaller[] callers = new SerialCaller[callerCount];
for (int i = 0; i < callerCount; i++) {
callers[i] = new SerialCaller(clients[i%clientCount], addr, callCount);
callers[i].start();
}
for (int i = 0; i < callerCount; i++) {
callers[i].join();
assertFalse(callers[i].failed);
}
for (int i = 0; i < clientCount; i++) {
clients[i].stop();
}
server.stop();
}
public void testParallel() throws Exception {
testParallel(10, false, 2, 4, 2, 4, 100);
}
public void testParallel(int handlerCount, boolean handlerSleep,
int serverCount, int addressCount,
int clientCount, int callerCount, int callCount)
throws Exception {
Server[] servers = new Server[serverCount];
for (int i = 0; i < serverCount; i++) {
servers[i] = new TestServer(handlerCount, handlerSleep);
servers[i].start();
}
InetSocketAddress[] addresses = new InetSocketAddress[addressCount];
for (int i = 0; i < addressCount; i++) {
addresses[i] = NetUtils.getConnectAddress(servers[i%serverCount]);
}
Client[] clients = new Client[clientCount];
for (int i = 0; i < clientCount; i++) {
clients[i] = new Client(LongWritable.class, conf);
}
ParallelCaller[] callers = new ParallelCaller[callerCount];
for (int i = 0; i < callerCount; i++) {
callers[i] =
new ParallelCaller(clients[i%clientCount], addresses, callCount);
callers[i].start();
}
for (int i = 0; i < callerCount; i++) {
callers[i].join();
assertFalse(callers[i].failed);
}
for (int i = 0; i < clientCount; i++) {
clients[i].stop();
}
for (int i = 0; i < serverCount; i++) {
servers[i].stop();
}
}
public void testStandAloneClient() throws Exception {
testParallel(10, false, 2, 4, 2, 4, 100);
Client client = new Client(LongWritable.class, conf);
InetSocketAddress address = new InetSocketAddress("127.0.0.1", 10);
try {
client.call(new LongWritable(RANDOM.nextLong()),
address, null, null);
fail("Expected an exception to have been thrown");
} catch (IOException e) {
String message = e.getMessage();
String addressText = address.toString();
assertTrue("Did not find "+addressText+" in "+message,
message.contains(addressText));
Throwable cause=e.getCause();
assertNotNull("No nested exception in "+e,cause);
String causeText=cause.getMessage();
assertTrue("Did not find " + causeText + " in " + message,
message.contains(causeText));
}
}
private static class LongErrorWritable extends LongWritable {
private final static String ERR_MSG =
"Come across an exception while reading";
LongErrorWritable() {}
LongErrorWritable(long longValue) {
super(longValue);
}
public void readFields(DataInput in) throws IOException {
super.readFields(in);
throw new IOException(ERR_MSG);
}
}
public void testErrorClient() throws Exception {
// start server
Server server = new TestServer(1, false);
InetSocketAddress addr = NetUtils.getConnectAddress(server);
server.start();
// start client
Client client = new Client(LongErrorWritable.class, conf);
try {
client.call(new LongErrorWritable(RANDOM.nextLong()),
addr, null, null);
fail("Expected an exception to have been thrown");
} catch (IOException e) {
// check error
Throwable cause = e.getCause();
assertTrue(cause instanceof IOException);
assertEquals(LongErrorWritable.ERR_MSG, cause.getMessage());
}
}
public static void main(String[] args) throws Exception {
//new TestIPC("test").testSerial(5, false, 2, 10, 1000);
new TestIPC("test").testParallel(10, false, 2, 4, 2, 4, 1000);
}
}