| /* |
| * 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 org.apache.cassandra.utils.Shared; |
| |
| import static org.apache.cassandra.utils.Shared.Scope.SIMULATION; |
| |
| @Shared(scope = SIMULATION) |
| public interface ResizableThreadPool |
| { |
| /** |
| * Returns core pool size of thread pool, the minimum |
| * number of workers (where that makes sense for a thread pool, |
| * SEPExecutor does not have a minimum size). |
| */ |
| public int getCorePoolSize(); |
| |
| /** |
| * Allows user to resize minimum size of the thread pool. |
| */ |
| public void setCorePoolSize(int newCorePoolSize); |
| |
| /** |
| * Returns maximum pool size of thread pool. |
| */ |
| public int getMaximumPoolSize(); |
| |
| /** |
| * Allows user to resize maximum size of the thread pool. |
| */ |
| public void setMaximumPoolSize(int newMaximumPoolSize); |
| |
| /** |
| * Returns the approximate number of threads that are actively |
| * executing tasks. |
| * |
| * @return the number of threads |
| */ |
| int getActiveTaskCount(); |
| |
| /** |
| * Returns the approximate total number of tasks that have |
| * completed execution. Because the states of tasks and threads |
| * may change dynamically during computation, the returned value |
| * is only an approximation, but one that does not ever decrease |
| * across successive calls. |
| * |
| * @return the number of tasks |
| */ |
| long getCompletedTaskCount(); |
| |
| /** |
| * Returns the approximate total of tasks waiting to be executed. |
| * Because the states of tasks and threads may change dynamically |
| * during computation, the returned value is only an approximation. |
| * |
| * @return the number of tasks |
| */ |
| int getPendingTaskCount(); |
| |
| default int getMaxTasksQueued() |
| { |
| return -1; |
| } |
| } |