| /* |
| * 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.jobs; |
| |
| |
| import org.jetbrains.annotations.NotNull; |
| import org.osgi.annotation.versioning.ProviderType; |
| |
| /** |
| * Components that implement JobConsumers are registered with the Job Sub System by an OSGi Whiteboard pattern. Once |
| * registered the component will be offered jobs matching the job types set as the OSGi property JobConsumer.JOB_TYPES. |
| * If the consumer accepts the job, by not throwing and exception on the execute method, it agrees to ensure that the job |
| * is executed. It may queue the job, but if queued it must ensure the job is executed. A JobConsumer should check that he |
| * dependencies required to execute the job are satisfied before accepting the job for execution. Queueing jobs in the job consumer |
| * to ensure that the execution threads of the JobConsumer have work available is ok, but queuing jobs to remove them from |
| * the job queue is to be discouraged, as it may require too much from the JobConsumer implementation to guarantee the contract |
| * in this interface. |
| */ |
| @ProviderType |
| public interface JobConsumer { |
| |
| String JOB_TYPES = "job.types"; |
| |
| /** |
| * Execute the job, given an initial state and supply a JobStateListener to allow the job to send updates of state change |
| * @param initialState the initial state of the Job. |
| * @param listener a listener to propagate JobUpdates. |
| * @param callback called when the job is completed. |
| * @throws RuntimeException or any subclass when the Job offered in initialState cant be accepted for execution. |
| */ |
| @NotNull |
| void execute(@NotNull Job initialState, @NotNull JobUpdateListener listener, @NotNull JobCallback callback); |
| } |