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The Apache Cassandra Project develops a highly scalable second-generation distributed database, bringing together Dynamo's fully distributed design and Bigtable's ColumnFamily-based data model.
/*
* 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;
}
}