2 * ============LICENSE_START=======================================================
3 * Copyright (C) 2016-2018 Ericsson. All rights reserved.
4 * ================================================================================
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
9 * http://www.apache.org/licenses/LICENSE-2.0
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
17 * SPDX-License-Identifier: Apache-2.0
18 * ============LICENSE_END=========================================================
21 package org.onap.policy.apex.plugins.executor.java;
23 import java.lang.reflect.Method;
25 import org.onap.policy.apex.context.ContextException;
26 import org.onap.policy.apex.core.engine.event.EnEvent;
27 import org.onap.policy.apex.core.engine.executor.TaskSelectExecutor;
28 import org.onap.policy.apex.core.engine.executor.context.TaskSelectionExecutionContext;
29 import org.onap.policy.apex.core.engine.executor.exception.StateMachineException;
30 import org.onap.policy.apex.model.basicmodel.concepts.AxArtifactKey;
31 import org.slf4j.ext.XLogger;
32 import org.slf4j.ext.XLoggerFactory;
35 * The Class JavaTaskSelectExecutor is the task selection executor for task selection logic written in Java.
37 * @author Liam Fallon (liam.fallon@ericsson.com)
39 public class JavaTaskSelectExecutor extends TaskSelectExecutor {
40 // Logger for this class
41 private static final XLogger LOGGER = XLoggerFactory.getXLogger(JavaTaskSelectExecutor.class);
43 // The Java Task Selection executor class
44 private Object taskSelectionLogicObject = null;
47 * Prepares the task for processing.
49 * @throws StateMachineException thrown when a state machine execution error occurs
52 public void prepare() throws StateMachineException {
53 // Call generic prepare logic
56 // Get the class for task selection
58 // Create the task logic object from the byte code of the class
59 taskSelectionLogicObject = Class.forName(getSubject().getTaskSelectionLogic().getLogic()).newInstance();
60 } catch (final Exception e) {
61 LOGGER.error("instantiation error on Java class" + taskSelectionLogicObject, e);
62 throw new StateMachineException("instantiation error on Java class" + taskSelectionLogicObject, e);
67 * Executes the executor for the task in a sequential manner.
69 * @param executionId the execution ID for the current APEX policy execution
70 * @param incomingEvent the incoming event
71 * @return The outgoing event
72 * @throws StateMachineException on an execution error
73 * @throws ContextException on context errors
76 public AxArtifactKey execute(final long executionId, final EnEvent incomingEvent)
77 throws StateMachineException, ContextException {
78 // Do execution pre work
79 executePre(executionId, incomingEvent);
81 // Check and execute the Java logic
82 boolean returnValue = false;
84 // Find and call the method with the signature "public boolean getTask(final TaskSelectionExecutionContext
85 // executor)" to invoke the task selection
86 // logic in the Java class
87 final Method method = taskSelectionLogicObject.getClass().getDeclaredMethod("getTask", (Class[])
88 new Class[] { TaskSelectionExecutionContext.class });
89 returnValue = (boolean) method.invoke(taskSelectionLogicObject, getExecutionContext());
90 } catch (final Exception e) {
92 "execute: task selection logic failed to run for state \"" + getSubject().getKey().getId() + "\"",
94 throw new StateMachineException(
95 "task selection logic failed to run for state \"" + getSubject().getKey().getId() + "\"", e);
98 // Do the execution post work
99 executePost(returnValue);
101 // Send back the return event
103 return getOutgoing();
110 * Cleans up the task after processing.
112 * @throws StateMachineException thrown when a state machine execution error occurs
115 public void cleanUp() throws StateMachineException {
116 LOGGER.debug("cleanUp:" + getSubject().getKey().getId() + ","
117 + getSubject().getTaskSelectionLogic().getLogicFlavour() + ","
118 + getSubject().getTaskSelectionLogic().getLogic());