| /* |
| * 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.cassandra.concurrent; |
| |
| import java.lang.Thread.UncaughtExceptionHandler; |
| import java.util.concurrent.ExecutorService; |
| import java.util.concurrent.RejectedExecutionHandler; |
| import java.util.concurrent.TimeUnit; |
| |
| import com.google.common.annotations.VisibleForTesting; |
| |
| import org.apache.cassandra.utils.JVMStabilityInspector; |
| import org.apache.cassandra.utils.Shared; |
| |
| import static org.apache.cassandra.utils.Shared.Scope.SIMULATION; |
| |
| /** |
| * Configure an executor before creating it. |
| * See {@link ThreadPoolExecutorBuilder} |
| */ |
| @Shared(scope = SIMULATION) |
| public interface ExecutorBuilder<E extends ExecutorService> |
| { |
| /** |
| * Threads for the executor built by this factory will timeout (terminate) after the specified period. |
| */ |
| ExecutorBuilder<E> withKeepAlive(long keepAlive, TimeUnit keepAliveUnits); |
| |
| /** |
| * Core threads for the executor built by this factory will never timeout (default for single threaded builders). |
| * Note that there is ordinarily no difference between core and non-core threads; only when the queue limit is zero |
| * do we create non-core threads. |
| */ |
| ExecutorBuilder<E> withKeepAlive(); |
| |
| /** |
| * Specify the priority of threads that service the executor built by this factory (default to {@link Thread#NORM_PRIORITY}) |
| */ |
| ExecutorBuilder<E> withThreadPriority(int threadPriority); |
| |
| /** |
| * Threads for the executor built by this factory will all be (transitively) members of {@code threadGroup}, |
| * but may directly reside in a child thread group. |
| */ |
| ExecutorBuilder<E> withThreadGroup(ThreadGroup threadGroup); |
| |
| /** |
| * Use the system default thread group for the threads we create. |
| * This is used only for testing, so that we do not hold onto a transitive global reference to all threads. |
| */ |
| @VisibleForTesting |
| ExecutorBuilder<E> withDefaultThreadGroup(); |
| |
| /** |
| * The executor built by this factory will limit the number of queued tasks; default is unlimited. |
| * Once the queue limit is reached and all threads are executing tasks will be rejected |
| * (see {@link #withRejectedExecutionHandler(RejectedExecutionHandler)}) |
| */ |
| ExecutorBuilder<E> withQueueLimit(int queueLimit); |
| |
| /** |
| * Set the {@link RejectedExecutionHandler} for the executor built by this factory. |
| * By default this is executor-specific, either: |
| * <li> {@link ThreadPoolExecutorBase#blockingExecutionHandler} |
| * <li> {@link ScheduledThreadPoolExecutorPlus#rejectedExecutionHandler} |
| * <li> and maybe wrapped by {@link ThreadPoolExecutorJMXAdapter#rejectedExecutionHandler} |
| */ |
| ExecutorBuilder<E> withRejectedExecutionHandler(RejectedExecutionHandler rejectedExecutionHandler); |
| |
| /** |
| * Set the {@link UncaughtExceptionHandler} for threads that service executors built by this factory. |
| * By default {@link JVMStabilityInspector#uncaughtException(Thread, Throwable)} |
| */ |
| ExecutorBuilder<E> withUncaughtExceptionHandler(UncaughtExceptionHandler uncaughtExceptionHandler); |
| |
| /** |
| * Build the configured executor |
| */ |
| E build(); |
| } |