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/*
* Copyright 2015 Open Networking Laboratory
*
* Licensed 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.onlab.util;
import org.apache.commons.lang3.concurrent.ConcurrentUtils;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ThreadFactory;
import static com.google.common.base.MoreObjects.toStringHelper;
/**
* Thread factory for creating threads that belong to the specified thread group.
*/
public final class GroupedThreadFactory implements ThreadFactory {
public static final String DELIMITER = "/";
private final ThreadGroup group;
// Cache of created thread factories.
private static final ConcurrentHashMap<String, GroupedThreadFactory> FACTORIES =
new ConcurrentHashMap<>();
/**
* Returns thread factory for producing threads associated with the specified
* group name. The group name-space is hierarchical, based on slash-delimited
* name segments, e.g. {@code onos/intent}.
*
* @param groupName group name
* @return thread factory
*/
public static GroupedThreadFactory groupedThreadFactory(String groupName) {
GroupedThreadFactory factory = FACTORIES.get(groupName);
if (factory != null) {
return factory;
}
// Find the parent group or root the group hierarchy under default group.
int i = groupName.lastIndexOf(DELIMITER);
if (i > 0) {
String name = groupName.substring(0, i);
ThreadGroup parentGroup = groupedThreadFactory(name).threadGroup();
factory = new GroupedThreadFactory(new ThreadGroup(parentGroup, groupName));
} else {
factory = new GroupedThreadFactory(new ThreadGroup(groupName));
}
return ConcurrentUtils.putIfAbsent(FACTORIES, groupName, factory);
}
// Creates a new thread group
private GroupedThreadFactory(ThreadGroup group) {
this.group = group;
}
/**
* Returns the thread group associated with the factory.
*
* @return thread group
*/
public ThreadGroup threadGroup() {
return group;
}
@Override
public Thread newThread(Runnable r) {
return new Thread(group, r);
}
@Override
public String toString() {
return toStringHelper(this).add("group", group).toString();
}
}
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