com.hazelcast.core.Offloadable Maven / Gradle / Ivy
/*
* Copyright (c) 2008-2018, Hazelcast, 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.hazelcast.core;
import com.hazelcast.config.Config;
import com.hazelcast.config.ExecutorConfig;
import com.hazelcast.map.EntryProcessor;
import com.hazelcast.spi.ExecutionService;
/**
* Allows off-loading the processing unit implementing this interface to the specified or default Executor.
*
* Currently supported in:
*
* - {@link IMap#executeOnKey(Object, EntryProcessor)}
* - {@link IMap#submitToKey(Object, EntryProcessor)}
* - {@link IMap#submitToKey(Object, EntryProcessor, ExecutionCallback)}
*
*/
public interface Offloadable {
/**
* Constant meaning that there will be no off-loading if returned from the {@link #getExecutorName()} method.
*/
String NO_OFFLOADING = "no-offloading";
/**
* Constant meaning that processing will be off-loaded to the default OFFLOADABLE_EXECUTOR executor.
* if returned from the {@link #getExecutorName()} method.
*
* @see ExecutionService#OFFLOADABLE_EXECUTOR
*/
String OFFLOADABLE_EXECUTOR = ExecutionService.OFFLOADABLE_EXECUTOR;
/**
* Returns the name of the executor to which the processing unit will be off-loaded.
*
* The return value equal to {@value OFFLOADABLE_EXECUTOR} indicates that the processing should off-loaded to the
* default {@link ExecutionService#OFFLOADABLE_EXECUTOR}.
*
* The return value equal to {@value NO_OFFLOADING} indicates that the processing should not be off-loaded at all.
* The processing will be executed as if the processing-unit didn't implement the {@link Offloadable} interface.
*
* Other return values will lookup the executor with the returned value which can be configured in the Hazelcast
* configuration.
*
* @return the name of the executor to which the processing should be off-loaded.
* @see ExecutorConfig
* @see Config#addExecutorConfig(ExecutorConfig)
*/
String getExecutorName();
}