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/*
 * Copyright 2014 the original author or authors.
 *
 * 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 org.gradle.internal.progress;

import net.jcip.annotations.ThreadSafe;
import org.gradle.internal.Factory;

/**
 * Runs build operations. These are the pieces of work that make up a build. Build operations can be nested inside other
 * build operations.
 *
 * The executor provides several capabilities:
 *
 * 
 *     Fires events via {@link InternalBuildListener}. For example, this means that notification of build operation
 *     execution can be received by tooling AIP clients.
 *     Generates progress logging events.
 * 
 *
 * This is intended to be synchronized with {@link org.gradle.internal.operations.BuildOperationProcessor}, to
 * allow both synchronous and asynchronous execution of build operations.
 */
@ThreadSafe
public interface BuildOperationExecutor {
    /**
     * Runs the given build operation synchronously. Invokes the given factory from the current thread and returns the result.
     *
     * 
Rethrows any exception thrown by the factory.
     */
     T run(String displayName, Factory factory);

    /**
     * Runs the given build operation synchronously. Invokes the given factory from the current thread and returns the result.
     *
     * Rethrows any exception thrown by the factory.
     */
     T run(BuildOperationDetails operationDetails, Factory factory);

    /**
     * Runs the given build operation synchronously. Invokes the given action from the current thread.
     *
     * Rethrows any exception thrown by the action.
     */
    void run(String displayName, Runnable action);

    /**
     * Runs the given build operation synchronously. Invokes the given action from the current thread.
     *
     * Rethrows any exception thrown by the action.
     */
    void run(BuildOperationDetails operationDetails, Runnable action);

    /**
     * Returns the id of the current operation.
     *
     * @throws IllegalStateException When the current thread is not executing an operation.
     */
    Object getCurrentOperationId();
}