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/*
* Copyright 2008-2012 Amazon Technologies, Inc. or its affiliates.
* Amazon, Amazon.com and Carbonado are trademarks or registered trademarks
* of Amazon Technologies, Inc. or its affiliates. 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.
*/
package com.amazon.carbonado.repo.map;
import java.util.*;
/**
*
*
* @author Brian S O'Neill
*/
@org.junit.Ignore
public class TestLockStress {
static long cSharedValue;
static volatile boolean cStop;
/**
* @param args args[0]: readers, args[1]: upgraders, args[2]: writers, args[3]: run time
*/
public static void main(String[] args) throws Exception {
final int readers = Integer.parseInt(args[0]);
final int upgraders = Integer.parseInt(args[1]);
final int writers = Integer.parseInt(args[2]);
final int runTimeSeconds = Integer.parseInt(args[3]);
final UpgradableLock lock = new UpgradableLock();
List<TestThread> threads = new ArrayList<TestThread>();
for (int i=0; i<readers; i++) {
TestThread t = new TestThread("reader " + i) {
public void run() {
while (!cStop) {
lock.lockForRead(this);
try {
long value = cSharedValue;
// Do some "work"
String.valueOf(value);
long again = cSharedValue;
if (again != value) {
throw new AssertionError("" + again + " != " + value);
}
mReadCount++;
} finally {
lock.unlockFromRead(this);
}
}
}
};
threads.add(t);
t.start();
}
for (int i=0; i<upgraders; i++) {
TestThread t = new TestThread("upgrader " + i) {
public void run() {
while (!cStop) {
lock.lockForUpgrade(this);
try {
long value = cSharedValue;
// Do some "work"
String.valueOf(value);
assert(cSharedValue == value);
lock.lockForWrite(this);
assert(cSharedValue == value);
try {
cSharedValue = value + 1;
} finally {
lock.unlockFromWrite(this);
}
mAdjustCount++;
} finally {
lock.unlockFromUpgrade(this);
}
}
}
};
threads.add(t);
t.start();
}
for (int i=0; i<writers; i++) {
TestThread t = new TestThread("writer " + i) {
public void run() {
while (!cStop) {
lock.lockForWrite(this);
try {
long value = cSharedValue;
// Do some "work"
String.valueOf(value);
assert(cSharedValue == value);
cSharedValue = value + 1;
mAdjustCount++;
} finally {
lock.unlockFromWrite(this);
}
}
}
};
threads.add(t);
t.start();
}
Thread.sleep(1000L * runTimeSeconds);
cStop = true;
for (TestThread t : threads) {
t.join();
}
long reads = 0;
for (TestThread t : threads) {
reads += t.mReadCount;
}
long expected = 0;
for (TestThread t : threads) {
expected += t.mAdjustCount;
}
System.out.println("Reads: " + reads);
System.out.println("Expected: " + expected);
System.out.println("Actual: " + cSharedValue);
if (expected == cSharedValue) {
System.out.println("SUCCESS");
} else {
System.out.println("FAILURE");
}
System.out.println();
for (TestThread t : threads) {
System.out.println(t.mReadCount + ", " + t.mAdjustCount);
}
}
private abstract static class TestThread extends Thread {
long mReadCount;
long mAdjustCount;
TestThread(String name) {
super(name);
}
}
}
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