private static void checkThreadInfo() throws Exception {
// assume all threads stay alive
long[] ids = (long[]) server.getAttribute(thread, "AllThreadIds");
Object result = server.invoke(thread, "getThreadInfo", new Object[] {ids}, new String[] {"[J"});
for (CompositeData cd : (CompositeData[]) result) {
printThreadInfo(cd);
}
result =
server.invoke(
thread,
"getThreadInfo",
new Object[] {ids, new Integer(2)},
new String[] {"[J", "int"});
for (CompositeData cd : (CompositeData[]) result) {
printThreadInfo(cd);
}
long id = Thread.currentThread().getId();
result =
server.invoke(thread, "getThreadInfo", new Object[] {new Long(id)}, new String[] {"long"});
printThreadInfo((CompositeData) result);
result =
server.invoke(
thread,
"getThreadInfo",
new Object[] {new Long(id), new Integer(2)},
new String[] {"long", "int"});
printThreadInfo((CompositeData) result);
}
// Acquire the lock if state is zero
public boolean tryAcquire(int acquires) {
assert acquires == 1; // Otherwise unused
if (compareAndSetState(0, 1)) {
setExclusiveOwnerThread(Thread.currentThread());
return true;
}
return false;
}
public static void main(String[] argv) throws Exception {
mbean = newPlatformMXBeanProxy(server, THREAD_MXBEAN_NAME, ThreadMXBean.class);
if (!mbean.isSynchronizerUsageSupported()) {
System.out.println("Monitoring of synchronizer usage not supported");
return;
}
thread.setDaemon(true);
thread.start();
// wait until myThread acquires mutex and lock owner is set.
while (!(mutex.isLocked() && mutex.getLockOwner() == thread)) {
try {
Thread.sleep(100);
} catch (InterruptedException e) {
throw new RuntimeException(e);
}
}
long[] ids = new long[] {thread.getId()};
// validate the local access
ThreadInfo[] infos = getThreadMXBean().getThreadInfo(ids, true, true);
if (infos.length != 1) {
throw new RuntimeException(
"Returned ThreadInfo[] of length=" + infos.length + ". Expected to be 1.");
}
thread.checkThreadInfo(infos[0]);
// validate the remote access
infos = mbean.getThreadInfo(ids, true, true);
if (infos.length != 1) {
throw new RuntimeException(
"Returned ThreadInfo[] of length=" + infos.length + ". Expected to be 1.");
}
thread.checkThreadInfo(infos[0]);
boolean found = false;
infos = mbean.dumpAllThreads(true, true);
for (ThreadInfo ti : infos) {
if (ti.getThreadId() == thread.getId()) {
thread.checkThreadInfo(ti);
found = true;
}
}
if (!found) {
throw new RuntimeException("No ThreadInfo found for MyThread");
}
System.out.println("Test passed");
}