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/*
 * 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.sling.bgservlets;

import java.util.Iterator;

/**
 * Service that executes Runnables, will later allow them to be suspended,
 * resumed, stopped and restarted.
 */
public interface ExecutionEngine {

    /** Add a job to the execution queue */
    void queueForExecution(Runnable job);

    /** Get JobStatus by path */
    JobStatus getJobStatus(String path);

    /**
     * Enumerate JobStatus that match supplied predicate
     * 
     * @param p
     *            if null, returns all known JobStatus.
     */
    Iterator getMatchingJobStatus(Predicate p);
}