/**
* 方法开始时调用,采集开始时间
*
* @param methodId
*/
public static void Start(int methodId) {
if (!Manager.instance().canProfile()) {
return;
}
long threadId = Thread.currentThread().getId();
if (threadId >= size) {
return;
}
long startTime;
if (Manager.isNeedNanoTime()) {
startTime = System.nanoTime();
} else {
startTime = System.currentTimeMillis();
}
try {
ThreadData thrData = threadProfile[(int) threadId];
if (thrData == null) {
thrData = new ThreadData();
threadProfile[(int) threadId] = thrData;
}
long[] frameData = new long[3];
frameData[0] = methodId;
frameData[1] = thrData.stackNum;
frameData[2] = startTime;
thrData.stackFrame.push(frameData);
thrData.stackNum++;
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 方法退出时调用,采集结束时间
*
* @param methodId
*/
public static void End(int methodId) {
if (!Manager.instance().canProfile()) {
return;
}
long threadId = Thread.currentThread().getId();
if (threadId >= size) {
return;
}
long endTime;
if (Manager.isNeedNanoTime()) {
endTime = System.nanoTime();
} else {
endTime = System.currentTimeMillis();
}
try {
ThreadData thrData = threadProfile[(int) threadId];
if (thrData == null || thrData.stackNum <= 0 || thrData.stackFrame.size() == 0) {
// 没有执行start,直接执行end/可能是异步停止导致的
return;
}
// 栈太深则抛弃部分数据
if (thrData.profileData.size() > 20000) {
thrData.stackNum--;
thrData.stackFrame.pop();
return;
}
thrData.stackNum--;
long[] frameData = thrData.stackFrame.pop();
long id = frameData[0];
if (methodId != id) {
return;
}
long useTime = endTime - frameData[2];
if (Manager.isNeedNanoTime()) {
if (useTime > 500000) {
frameData[2] = useTime;
thrData.profileData.push(frameData);
}
} else if (useTime > 1) {
frameData[2] = useTime;
thrData.profileData.push(frameData);
}
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* @param args
* @param inst
*/
public static void premain(String args, Instrumentation inst) {
inst.addTransformer(new ProfTransformer());
Manager.instance().startupThread();
}
