Android example source code file (TraceTest.java)

This example Android source code file (TraceTest.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Android by Example" ^TM.

Java - Android tags/keywords

android, androidtestcase, could, interruptedexception, largetest, loading, os, override, smalltest, string, successfully, suppress, tag, test, thread, tracetest, unsatisfiedlinkerror, util, utilities, utils

The TraceTest.java Android example source code

/*
 * Copyright (C) 2006 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 android.os;

import android.os.Debug;
import android.test.AndroidTestCase;
import android.test.suitebuilder.annotation.LargeTest;
import android.test.suitebuilder.annotation.SmallTest;
import android.test.suitebuilder.annotation.Suppress;
import android.util.Log;

/**
 * This class is used to test the native tracing support.  Run this test
 * while tracing on the emulator and then run traceview to view the trace.
 */
public class TraceTest extends AndroidTestCase
{
    private static final String TAG = "TraceTest";
    private int eMethodCalls = 0;
    private int fMethodCalls = 0;
    private int gMethodCalls = 0;
    
    @SmallTest
    public void testNativeTracingFromJava()
    {
        long start = System.currentTimeMillis();
        Debug.startNativeTracing();
        //nativeMethod();
        int count = 0;
        for (int ii = 0; ii < 20; ii++) {
            count = eMethod();
        }
        Debug.stopNativeTracing();
        long end = System.currentTimeMillis();
        long elapsed = end - start;
        Log.i(TAG, "elapsed millis: " + elapsed);
        Log.i(TAG, "eMethod calls: " + eMethodCalls
                + " fMethod calls: " + fMethodCalls
                + " gMethod calls: " + gMethodCalls);
    }
    
    // This should not run in the automated suite.
    @Suppress
    public void disableTestNativeTracingFromC()
    {
        long start = System.currentTimeMillis();
        nativeMethodAndStartTracing();
        long end = System.currentTimeMillis();
        long elapsed = end - start;
        Log.i(TAG, "elapsed millis: " + elapsed);
    }

    native void nativeMethod();
    native void nativeMethodAndStartTracing();
    
    @LargeTest
    public void testMethodTracing()
    {
        long start = System.currentTimeMillis();
        Debug.startMethodTracing("traceTest");
        topMethod();
        Debug.stopMethodTracing();
        long end = System.currentTimeMillis();
        long elapsed = end - start;
        Log.i(TAG, "elapsed millis: " + elapsed);
    }
    
    private void topMethod() {
        aMethod();
        bMethod();
        cMethod();
        dMethod(5);
        
        Thread t1 = new aThread();
        t1.start();
        Thread t2 = new aThread();
        t2.start();
        Thread t3 = new aThread();
        t3.start();
        try {
            t1.join();
            t2.join();
            t3.join();
        } catch (InterruptedException e) {
        }
    }
    
    private class aThread extends Thread {
        @Override
        public void run() {
            aMethod();
            bMethod();
            cMethod();
        }
    }
    
    /** Calls other methods to make some interesting trace data.
     * 
     * @return a meaningless value
     */
    private int aMethod() {
        int count = 0;
        for (int ii = 0; ii < 6; ii++) {
            count += bMethod();
        }
        for (int ii = 0; ii < 5; ii++) {
            count += cMethod();
        }
        for (int ii = 0; ii < 4; ii++) {
            count += dMethod(ii);
        }
        return count;
    }
    
    /** Calls another method to make some interesting trace data.
     * 
     * @return a meaningless value
     */
    private int bMethod() {
        int count = 0;
        for (int ii = 0; ii < 4; ii++) {
            count += cMethod();
        }
        return count;
    }
    
    /** Executes a simple loop to make some interesting trace data.
     * 
     * @return a meaningless value
     */
    private int cMethod() {
        int count = 0;
        for (int ii = 0; ii < 1000; ii++) {
            count += ii;
        }
        return count;
    }
    
    /** Calls itself recursively to make some interesting trace data.
     * 
     * @return a meaningless value
     */
    private int dMethod(int level) {
        int count = 0;
        if (level > 0) {
            count = dMethod(level - 1);
        }
        for (int ii = 0; ii < 100; ii++) {
            count += ii;
        }
        if (level == 0) {
            return count;
        }
        return dMethod(level - 1);
    }
    
    public int eMethod() {
        eMethodCalls += 1;
        int count = fMethod();
        count += gMethod(3);
        return count;
    }
    
    public int fMethod() {
        fMethodCalls += 1;
        int count = 0;
        for (int ii = 0; ii < 10; ii++) {
            count += ii;
        }
        return count;
    }
    
    public int gMethod(int level) {
        gMethodCalls += 1;
        int count = level;
        if (level > 1)
            count += gMethod(level - 1);
        return count;
    }

    /*
     * This causes the native shared library to be loaded when the
     * class is first used.  The library is only loaded once, even if
     * multiple classes include this line.
     *
     * The library must be in java.library.path, which is derived from
     * LD_LIBRARY_PATH.  The actual library name searched for will be
     * "libtrace_test.so" under Linux, but may be different on other
     * platforms.
     */
    static {
        Log.i(TAG, "Loading trace_test native library...");
        try {
            System.loadLibrary("trace_test");
            Log.i(TAG, "Successfully loaded trace_test native library");
        }
        catch (UnsatisfiedLinkError ule) {
            Log.w(TAG, "Could not load trace_test native library");
        }
    }
}