org.apache.jackrabbit.oak.spi.whiteboard.WhiteboardExecutor Maven / Gradle / Ivy
/*
* 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.jackrabbit.oak.spi.whiteboard;
import java.util.concurrent.Executor;
import javax.annotation.Nonnull;
/**
* Dynamic {@link Executor} based on the available whiteboard services.
* The {@link #execute(Runnable)} method passes the given command to the
* first available executor service. Alternatively the command is run
* in the calling thread if no executor services are available.
*/
public class WhiteboardExecutor extends AbstractServiceTracker
implements Executor {
public WhiteboardExecutor() {
super(Executor.class);
}
//----------------------------------------------------------< Executor >--
@Override
public void execute(@Nonnull Runnable command) {
for (Executor executor : getServices()) {
// use the first executor to run the command
executor.execute(command);
return;
}
// no executor services available, so use the current thread instead
command.run();
}
}