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.jython;
25 import org.onap.policy.apex.context.ContextException;
26 import org.onap.policy.apex.core.engine.executor.TaskExecutor;
27 import org.onap.policy.apex.core.engine.executor.exception.StateMachineException;
28 import org.python.core.CompileMode;
29 import org.python.core.Py;
30 import org.python.core.PyCode;
31 import org.python.core.PyException;
32 import org.python.util.PythonInterpreter;
33 import org.slf4j.ext.XLogger;
34 import org.slf4j.ext.XLoggerFactory;
37 * The Class JythonTaskExecutor is the task executor for task logic written in Jython It is unlikely that this is thread
40 * @author Liam Fallon (liam.fallon@ericsson.com)
42 public class JythonTaskExecutor extends TaskExecutor {
43 // Logger for this class
44 private static final XLogger LOGGER = XLoggerFactory.getXLogger(JythonTaskExecutor.class);
46 // The Jython interpreter
47 private final PythonInterpreter interpreter = new PythonInterpreter();
48 private PyCode compiled = null;
51 * Prepares the task for processing.
53 * @throws StateMachineException thrown when a state machine execution error occurs
56 public void prepare() throws StateMachineException {
57 interpreter.setErr(System.err);
58 interpreter.setOut(System.out);
60 // Call generic prepare logic
63 synchronized (Py.class) {
64 compiled = Py.compile_flags(getSubject().getTaskLogic().getLogic(),
65 "<" + getSubject().getKey().toString() + ">", CompileMode.exec, null);
67 } catch (final PyException e) {
68 LOGGER.warn("failed to compile Jython code for task " + getSubject().getKey().getID(), e);
69 throw new StateMachineException("failed to compile Jython code for task " + getSubject().getKey().getID(),
76 * Executes the executor for the task in a sequential manner.
78 * @param executionID the execution ID for the current APEX policy execution
79 * @param incomingFields the incoming fields
80 * @return The outgoing fields
81 * @throws StateMachineException on an execution error
82 * @throws ContextException on context errors
85 public Map<String, Object> execute(final long executionID, final Map<String, Object> incomingFields)
86 throws StateMachineException, ContextException {
88 boolean returnValue = false;
90 // Do execution pre work
91 executePre(executionID, incomingFields);
95 // Check and execute the Jython logic
96 /* Precompiled Version */
97 synchronized (Py.class) {
98 // Set up the Jython engine
99 interpreter.set("executor", getExecutionContext());
100 interpreter.exec(compiled);
102 final Object ret = interpreter.get("returnValue", java.lang.Boolean.class);
104 LOGGER.error("execute: task logic failed to set a return value for task \""
105 + getSubject().getKey().getID() + "\"");
106 throw new StateMachineException("execute: task logic failed to set a return value for task \""
107 + getSubject().getKey().getID() + "\"");
109 returnValue = (Boolean) ret;
110 } catch (NullPointerException | ClassCastException e) {
111 LOGGER.error("execute: task selection logic failed to set a correct return value for state \""
112 + getSubject().getKey().getID() + "\"", e);
113 throw new StateMachineException(
114 "execute: task selection logic failed to set a return value for state \""
115 + getSubject().getKey().getID() + "\"",
120 } catch (final Exception e) {
121 LOGGER.warn("failed to execute Jython code for task " + getSubject().getKey().getID(), e);
122 throw new StateMachineException("failed to execute Jython code for task " + getSubject().getKey().getID(),
126 // Do the execution post work
127 executePost(returnValue);
129 // Send back the return event
131 return getOutgoing();
138 * Cleans up the task after processing.
140 * @throws StateMachineException thrown when a state machine execution error occurs
143 public void cleanUp() throws StateMachineException {
144 interpreter.cleanup();
145 LOGGER.debug("cleanUp:" + getSubject().getKey().getID() + "," + getSubject().getTaskLogic().getLogicFlavour()
146 + "," + getSubject().getTaskLogic().getLogic());