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;
23 import org.onap.policy.apex.context.ContextException;
24 import org.onap.policy.apex.core.engine.event.EnEvent;
25 import org.onap.policy.apex.core.engine.executor.TaskSelectExecutor;
26 import org.onap.policy.apex.core.engine.executor.exception.StateMachineException;
27 import org.onap.policy.apex.model.basicmodel.concepts.AxArtifactKey;
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 JythonTaskSelectExecutor is the task selection executor for task selection logic written in Jython It is
38 * unlikely that this is thread safe.
40 * @author Liam Fallon (liam.fallon@ericsson.com)
42 public class JythonTaskSelectExecutor extends TaskSelectExecutor {
43 private static final XLogger LOGGER = XLoggerFactory.getXLogger(JythonTaskSelectExecutor.class);
45 // The Jython interpreter
46 private final PythonInterpreter interpreter = new PythonInterpreter();
47 private PyCode compiled = null;
50 * Prepares the task for processing.
52 * @throws StateMachineException thrown when a state machine execution error occurs
55 public void prepare() throws StateMachineException {
56 interpreter.setErr(System.err);
57 interpreter.setOut(System.out);
59 // Call generic prepare logic
62 synchronized (Py.class) {
63 compiled = Py.compile_flags(getSubject().getTaskSelectionLogic().getLogic(),
64 "<" + getSubject().getKey().toString() + ">", CompileMode.exec, null);
66 } catch (final PyException e) {
67 LOGGER.warn("failed to compile Jython code for task selection logic in " + getSubject().getKey().getID(),
69 throw new StateMachineException(
70 "failed to compile Jython code for task selection logic in " + getSubject().getKey().getID(), e);
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 incomingEvent the incoming event
80 * @return The outgoing event
81 * @throws StateMachineException on an execution error
82 * @throws ContextException on context errors
85 public AxArtifactKey execute(final long executionID, final EnEvent incomingEvent)
86 throws StateMachineException, ContextException {
88 boolean returnValue = false;
90 // Do execution pre work
91 executePre(executionID, incomingEvent);
94 // Check and execute the Jython logic
95 /* Precompiled Version */
96 synchronized (Py.class) {
97 // Set up the Jython engine
98 interpreter.set("executor", getExecutionContext());
99 interpreter.exec(compiled);
102 final Object ret = interpreter.get("returnValue", java.lang.Boolean.class);
104 LOGGER.error("execute: task selection logic failed to set a return value for state \""
105 + getSubject().getKey().getID() + "\"");
106 throw new StateMachineException(
107 "execute: task selection logic failed to set a return value for state \""
108 + getSubject().getKey().getID() + "\"");
110 returnValue = (Boolean) ret;
111 } catch (NullPointerException | ClassCastException e) {
112 LOGGER.error("execute: task selection logic failed to set a correct return value for state \""
113 + getSubject().getKey().getID() + "\"", e);
114 throw new StateMachineException(
115 "execute: task selection logic failed to set a return value for state \""
116 + getSubject().getKey().getID() + "\"",
121 } catch (final Exception e) {
122 LOGGER.warn("failed to execute Jython code for task selection logic in " + getSubject().getKey().getID(),
124 throw new StateMachineException(
125 "failed to execute Jython code for task selection logic in " + getSubject().getKey().getID(), e);
128 // Do the execution post work
129 executePost(returnValue);
131 // Send back the return event
133 return getOutgoing();
140 * Cleans up the task after processing.
142 * @throws StateMachineException thrown when a state machine execution error occurs
145 public void cleanUp() throws StateMachineException {
146 interpreter.cleanup();
147 LOGGER.debug("cleanUp:" + getSubject().getKey().getID() + ","
148 + getSubject().getTaskSelectionLogic().getLogicFlavour() + ","
149 + getSubject().getTaskSelectionLogic().getLogic());