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Palantir open source project
/*
* (c) Copyright 2022 Palantir Technologies Inc. All rights reserved.
*
* 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 com.palantir.common.concurrent;
import java.util.Map;
import java.util.Optional;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ExecutorService;
public final class SharedFixedExecutors {
private static final Map SHARED = new ConcurrentHashMap<>();
private SharedFixedExecutors() {
// enums should be immutable
}
public static ExecutorService getOrCreate(String threadName, int poolSize) {
return SHARED.computeIfAbsent(threadName, name -> PTExecutors.newFixedThreadPool(poolSize, name));
}
public static ExecutorService createOrGetShared(String threadName, int poolSize, Optional sharedThreads) {
if (sharedThreads.isPresent()) {
ExecutorService sharedExecutor = getOrCreate(threadName, poolSize);
return PTExecutors.getViewExecutor(threadName, poolSize, Integer.MAX_VALUE, sharedExecutor);
}
return PTExecutors.newFixedThreadPool(poolSize, threadName);
}
}