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/*
* Copyright (C) 2009 The Android Open Source Project
*
* 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.android.unit_tests;
import android.app.Activity;
import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.test.suitebuilder.annotation.LargeTest;
import android.test.suitebuilder.annotation.Suppress;
import android.util.Log;
import java.io.File;
import java.util.concurrent.atomic.AtomicInteger;
import android.test.AndroidTestCase;
import junit.framework.TestCase;
/*
* This is a series of unit tests for database locks.
*
* Suppress these tests for now, since they have has inconsistent results.
* This should be turned into a performance tracking test.
*/
@Suppress
public class DatabaseLockTest extends AndroidTestCase {
private static final int NUM_ITERATIONS = 100;
private static final int SLEEP_TIME = 30;
private static final int MAX_ALLOWED_LATENCY_TIME = 30;
private SQLiteDatabase mDatabase;
private File mDatabaseFile;
private AtomicInteger mCounter = new AtomicInteger();
@Override
protected void setUp() throws Exception {
super.setUp();
File parentDir = getContext().getFilesDir();
mDatabaseFile = new File(parentDir, "database_test.db");
if (mDatabaseFile.exists()) {
mDatabaseFile.delete();
}
mDatabase = SQLiteDatabase.openOrCreateDatabase(mDatabaseFile.getPath(), null);
assertNotNull(mDatabase);
}
@Override
protected void tearDown() throws Exception {
mDatabase.close();
mDatabaseFile.delete();
super.tearDown();
}
/*
* testLockFairness() tests the fairness of prioritizing multiple threads
* attempting to access a database concurrently.
* This test is intended to verify that, when two threads are accessing the
* same database at the same time with the same prioritization, neither thread
* is locked out and prevented from accessing the database.
*/
@Suppress
public void testLockFairness() {
startDatabaseFairnessThread();
int previous = 0;
for (int i = 0; i < NUM_ITERATIONS; i++) {
mDatabase.beginTransaction();
int val = mCounter.get();
if (i == 0) {
previous = val - i;
}
assertTrue(previous == (val - i));
try {
Thread.currentThread().sleep(SLEEP_TIME);
} catch (InterruptedException e) {
// ignore
}
mDatabase.endTransaction();
}
}
/*
* This function is to create the second thread for testLockFairness() test.
*/
private void startDatabaseFairnessThread() {
Thread thread = new DatabaseFairnessThread();
thread.start();
}
private class DatabaseFairnessThread extends Thread {
@Override
public void run() {
for (int i = 0; i < NUM_ITERATIONS; i++) {
mDatabase.beginTransaction();
int val = mCounter.incrementAndGet();
try {
Thread.currentThread().sleep(SLEEP_TIME);
} catch (InterruptedException e) {
// ignore
}
mDatabase.endTransaction();
}
}
}
/*
* testLockLatency() tests the latency of database locks.
* This test is intended to verify that, even when two threads are accessing
* the same database, the locking/unlocking of the database is done within an
* appropriate amount of time (MAX_ALLOWED_LATENCY_TIME).
*/
@Suppress
public void testLockLatency() {
startDatabaseLatencyThread();
int previous = 0;
long sumTime = 0;
long maxTime = 0;
for (int i = 0; i < NUM_ITERATIONS; i++) {
long startTime = System.currentTimeMillis();
mDatabase.beginTransaction();
long endTime = System.currentTimeMillis();
long elapsedTime = endTime - startTime;
if (maxTime < elapsedTime) {
maxTime = elapsedTime;
}
sumTime += elapsedTime;
try {
Thread.currentThread().sleep(SLEEP_TIME);
} catch (InterruptedException e) {
// ignore
}
mDatabase.endTransaction();
}
long averageTime = sumTime/NUM_ITERATIONS;
Log.i("DatabaseLockLatency", "AverageTime: " + averageTime);
Log.i("DatabaseLockLatency", "MaxTime: " + maxTime);
assertTrue( (averageTime - SLEEP_TIME) <= MAX_ALLOWED_LATENCY_TIME);
}
/*
* This function is to create the second thread for testLockLatency() test.
*/
private void startDatabaseLatencyThread() {
Thread thread = new DatabaseLatencyThread();
thread.start();
}
private class DatabaseLatencyThread extends Thread {
@Override
public void run() {
for (int i = 0; i < NUM_ITERATIONS; i++)
{
mDatabase.beginTransaction();
try {
Thread.currentThread().sleep(SLEEP_TIME);
} catch (InterruptedException e) {
// ignore
}
mDatabase.endTransaction();
}
}
}
}
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