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- /* *******************************************************************
- * Copyright (c) 2004 IBM Corporation
- *
- * All rights reserved.
- * This program and the accompanying materials are made available
- * under the terms of the Eclipse Public License v 2.0
- * which accompanies this distribution and is available at
- * https://www.eclipse.org/org/documents/epl-2.0/EPL-2.0.txt
- *
- * Contributors:
- * Andy Clement initial implementation
- * Copied from bits of original CFlowStack
- * ******************************************************************/
- package org.aspectj.runtime.internal.cflowstack;
-
- import java.util.List;
- import java.util.ArrayList;
- import java.util.Enumeration;
- import java.util.Hashtable;
-
- public class ThreadCounterImpl11 implements ThreadCounter {
- private Hashtable<Thread, Counter> counters = new Hashtable<>();
- private Thread cached_thread;
- private Counter cached_counter;
-
- private int change_count = 0;
- private static final int COLLECT_AT = 20000;
- private static final int MIN_COLLECT_AT = 100;
-
- static class Counter {
- protected int value = 0;
- }
-
- private synchronized Counter getThreadCounter() {
- if (Thread.currentThread() != cached_thread) {
- cached_thread = Thread.currentThread();
- cached_counter = counters.get(cached_thread);
- if (cached_counter == null) {
- cached_counter = new Counter();
- counters.put(cached_thread, cached_counter);
- }
- change_count++;
- // Collect more often if there are many threads, but not *too* often
- int size = Math.max(1, counters.size()); // should be >1 b/c always live threads, but...
- if (change_count > Math.max(MIN_COLLECT_AT, COLLECT_AT/size)) {
- List<Thread> dead_stacks = new ArrayList<>();
- for (Enumeration<Thread> e = counters.keys(); e.hasMoreElements(); ) {
- Thread t = e.nextElement();
- if (!t.isAlive()) dead_stacks.add(t);
- }
- for (Thread t : dead_stacks) {
- counters.remove(t);
- }
- change_count = 0;
- }
- }
- return cached_counter;
- }
-
- public void inc() {
- getThreadCounter().value++;
- }
-
- public void dec() {
- getThreadCounter().value--;
- }
-
- public boolean isNotZero() {
- return getThreadCounter().value!=0;
- }
-
- public void removeThreadCounter() {
- // TODO
- }
-
- }
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