1 /* 2 * Copyright (C) 2010 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package dalvik.system.profiler; 18 19 import java.util.Arrays; 20 21 /** 22 * ThreadSampler implementation that only uses Thread.getStackTrace() 23 * and therefore is portable. 24 */ 25 class PortableThreadSampler implements ThreadSampler { 26 27 private int depth; 28 setDepth(int depth)29 @Override public void setDepth(int depth) { 30 this.depth = depth; 31 } 32 getStackTrace(Thread thread)33 @Override public StackTraceElement[] getStackTrace(Thread thread) { 34 StackTraceElement[] stackFrames = thread.getStackTrace(); 35 if (stackFrames.length == 0) { 36 return null; 37 } 38 if (stackFrames.length > depth) { 39 stackFrames = Arrays.copyOfRange(stackFrames, 0, depth); 40 } 41 return stackFrames; 42 } 43 } 44