| // 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.cloudstack.framework.jobs; |
| |
| import java.util.concurrent.Future; |
| import java.util.concurrent.TimeUnit; |
| |
| /** |
| * Outcome is returned by clients of jobs framework as a way to wait for the |
| * outcome of a job. It fully complies with how Future interface is designed. |
| * In addition, it allows the callee to file a task to be scheduled when the |
| * job completes. |
| * |
| * Note that the callee should schedule a job when using the Task interface. |
| * It shouldn't try to complete the job in the schedule code as that will take |
| * up threads in the jobs framework. |
| * |
| * For the client of the jobs framework, you can either use the OutcomeImpl |
| * class to implement this interface or you can add to this interface to |
| * allow for your specific exceptions to be thrown. |
| * |
| * @param <T> Object returned to the callee when the job completes |
| */ |
| public interface Outcome<T> extends Future<T> { |
| AsyncJob getJob(); |
| |
| /** |
| * In addition to the normal Future methods, Outcome allows the ability |
| * to register a schedule task to be performed when the job is completed. |
| * |
| * @param listener |
| */ |
| void execute(Task<T> task); |
| |
| void execute(Task<T> task, long wait, TimeUnit unit); |
| |
| /** |
| * Listener is used by Outcome to schedule a task to run when a job |
| * completes. |
| * |
| * @param <T> T result returned |
| */ |
| public interface Task<T> extends Runnable { |
| void schedule(AsyncJobExecutionContext context, T result); |
| |
| void scheduleOnError(AsyncJobExecutionContext context, Throwable e); |
| } |
| } |