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 java.util.Properties;
27 import org.onap.policy.apex.context.ContextException;
28 import org.onap.policy.apex.core.engine.executor.TaskExecutor;
29 import org.onap.policy.apex.core.engine.executor.context.TaskExecutionContext;
30 import org.onap.policy.apex.core.engine.executor.exception.StateMachineException;
31 import org.slf4j.ext.XLogger;
32 import org.slf4j.ext.XLoggerFactory;
35 * The Class JavaTaskExecutor is the task executor for task logic written in Java.
37 * @author Liam Fallon (liam.fallon@ericsson.com)
39 public class JavaTaskExecutor extends TaskExecutor {
40 // Logger for this class
41 private static final XLogger LOGGER = XLoggerFactory.getXLogger(JavaTaskExecutor.class);
43 // The Java Task executor class
44 private Object taskLogicObject = 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 execution
58 // Create the task logic object from the byte code of the class
59 taskLogicObject = Class.forName(getSubject().getTaskLogic().getLogic()).newInstance();
60 } catch (final Exception e) {
61 LOGGER.error("instantiation error on Java class \"" + getSubject().getTaskLogic().getLogic() + "\"", e);
62 throw new StateMachineException(
63 "instantiation error on Java class \"" + getSubject().getTaskLogic().getLogic() + "\"", e);
68 * Executes the executor for the task in a sequential manner.
70 * @param executionId the execution ID for the current APEX policy execution
71 * @param executionProperties properties for the current APEX policy execution
72 * @param incomingFields the incoming fields
73 * @return The outgoing fields
74 * @throws StateMachineException on an execution error
75 * @throws ContextException on context errors
78 public Map<String, Object> execute(final long executionId, final Properties executionProperties,
79 final Map<String, Object> incomingFields) throws StateMachineException, ContextException {
80 // Do execution pre work
81 executePre(executionId, executionProperties, incomingFields);
83 // Check and execute the Java logic
84 boolean returnValue = false;
86 // Find and call the method with the signature "public boolean getEvent(final TaskExecutionContext executor)
87 // throws ApexException" to invoke the
88 // task logic in the Java class
89 final Method method = taskLogicObject.getClass().getDeclaredMethod("getEvent",
90 new Class[] { TaskExecutionContext.class });
91 returnValue = (boolean) method.invoke(taskLogicObject, getExecutionContext());
92 } catch (final Exception e) {
93 LOGGER.error("execute: task logic failed to run for task \"" + getSubject().getKey().getId() + "\"");
94 throw new StateMachineException(
95 "task logic failed to run for task \"" + getSubject().getKey().getId() + "\"", e);
98 // Do the execution post work
99 executePost(returnValue);
101 // Send back the return event
102 return getOutgoing();
106 * Cleans up the task after processing.
108 * @throws StateMachineException thrown when a state machine execution error occurs
111 public void cleanUp() throws StateMachineException {
112 LOGGER.debug("cleanUp:" + getSubject().getKey().getId() + "," + getSubject().getTaskLogic().getLogicFlavour()
113 + "," + getSubject().getTaskLogic().getLogic());