blob: bc456e765cdd644665562a29e3f19e22efb7afcb [file] [log] [blame]
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 org.apache.activemq.artemis.utils.actors;
/**
* This abstract class will encapsulate
* ThreadLocals to determine when a class is a handler.
* This is because some functionality has to be avoided if inHandler().
*
*/
public abstract class HandlerBase {
private static class Counter {
int count = 0;
}
/** an actor could be used within an OrderedExecutor. So we need this counter to decide if there's a Handler anywhere in the stack trace */
private static final ThreadLocal<Counter> inHandler = ThreadLocal.withInitial(() -> new Counter());
protected static void enter() {
inHandler.get().count++;
}
public static boolean inHandler() {
return inHandler.get().count > 0;
}
protected static void leave() {
inHandler.get().count--;
}
}