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/*
 * Copyright (c) 2008-2016, 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.spi.impl.operationexecutor;

/**
 * A Factory for creating {@link OperationRunner} instances.
 */
public interface OperationRunnerFactory {

    /**
     * Creates an OperationRunner for a given partition. This OperationRunner will only execute generic operations
     * and operations for that given partition.
     *
     * @param partitionId the id of the partition.
     * @return the created OperationRunner.
     */
    OperationRunner createPartitionRunner(int partitionId);

    /**
     * Creates an OperationRunner to execute generic Operations.
     *
     * @return the created OperationRunner
     */
    OperationRunner createGenericRunner();

    /**
     * Creates an ad hoc generic OperationRunner.
     *
     * Why do we need ad-hoc operation runners; why not use the generic ones? The problem is that within Operations
     * can be executed directly on the calling thread and totally bypassing the generic threads. The problem is that
     * for these kinds of 'ad hoc' executions, you need to have a OperationRunner.
     *
     * The ad hoc OperationRunner can be used for these ad hoc executions. It is immutable and won't expose the
     * {@link OperationRunner#currentTask()}. Therefor it is save to be shared between threads without running
     * into problems.
     *
     * @return the created ad hoc OperationRunner.
     * @see com.hazelcast.spi.OperationService#runOperationOnCallingThread(com.hazelcast.spi.Operation)
     */
    OperationRunner createAdHocRunner();
}