| /* |
| * 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.oodt.cas.workflow.engine.runner; |
| |
| //OODT imports |
| import org.apache.oodt.cas.metadata.Metadata; |
| import org.apache.oodt.cas.workflow.engine.processor.TaskProcessor; |
| import org.apache.oodt.cas.workflow.instrepo.WorkflowInstanceRepository; |
| import org.apache.oodt.cas.workflow.structs.WorkflowTask; |
| |
| /** |
| * |
| * Obfuscates the underlying substrate on which a {@link WorkflowTask} should |
| * run. In short, executes a {@link WorkflowTask} for the Workflow Engine. |
| * |
| * @author bfoster |
| * @author mattmann |
| * @version $Revision$ |
| * |
| */ |
| public abstract class EngineRunner { |
| |
| /** |
| * Executes a {@link TaskProcessor} on an execution substrate. Ideally there |
| * will only ever be two of these substrates, one for local execution, and |
| * another for communication with the Resource Manager. |
| * |
| * @param taskProcessor |
| * The {@link TaskProcessor} to instantiate and execute. |
| * |
| * @throws Exception |
| * If any error occurs. |
| */ |
| public abstract void execute(TaskProcessor taskProcessor) |
| throws Exception; |
| |
| /** |
| * Shuts this runner down and frees its resources. |
| * |
| * @throws Exception |
| * If any error occurs while freeing resources. |
| * |
| */ |
| public abstract void shutdown() throws Exception; |
| |
| /** |
| * Decides whether or not there are available slots within this runner |
| * to execute the provided {@link TaskProcessor}. |
| * |
| * @param workflowTask The {@link TaskProcessor} to execute. |
| * @return True if there is an open slot, false otherwise. |
| * @throws Exception If any error occurs. |
| */ |
| public abstract boolean hasOpenSlots(TaskProcessor taskProcessor) throws Exception; |
| |
| |
| public abstract void setInstanceRepository(WorkflowInstanceRepository instRep); |
| |
| } |