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.StateFinalizerExecutor;
27 import org.onap.policy.apex.core.engine.executor.exception.StateMachineException;
28 import org.python.core.Py;
29 import org.python.core.PyCode;
30 import org.python.core.PyException;
31 import org.python.util.PythonInterpreter;
32 import org.slf4j.ext.XLogger;
33 import org.slf4j.ext.XLoggerFactory;
36 * The Class JythonStateFinalizerExecutor is the state finalizer executor for state finalizer logic written in Jython It
37 * is unlikely that this is thread safe.
39 * @author Liam Fallon (liam.fallon@ericsson.com)
41 public class JythonStateFinalizerExecutor extends StateFinalizerExecutor {
42 // Logger for this class
43 private static final XLogger LOGGER = XLoggerFactory.getXLogger(JythonStateFinalizerExecutor.class);
45 // The Jython interpreter
46 private final PythonInterpreter interpreter = new PythonInterpreter();
47 private PyCode compiled = null;
50 * Prepares the state finalizer 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().getLogic(), "<" + getSubject().getKey().toString() + ">",
66 } catch (final PyException e) {
67 LOGGER.warn("failed to compile Jython code for state finalizer " + getSubject().getKey(), e);
68 throw new StateMachineException(
69 "failed to compile Jython code for state finalizer " + getSubject().getKey(), e);
75 * Executes the executor for the state finalizer logic in a sequential manner.
77 * @param executionID the execution ID for the current APEX policy execution
78 * @param incomingFields the incoming fields for finalisation
79 * @return The state output for the state
80 * @throws StateMachineException on an execution error
81 * @throws ContextException on context errors
84 public String execute(final long executionID, final Map<String, Object> incomingFields)
85 throws StateMachineException, ContextException {
87 boolean returnValue = false;
89 // Do execution pre work
90 executePre(executionID, incomingFields);
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);
100 returnValue = (boolean) interpreter.get("returnValue", java.lang.Boolean.class);
103 } catch (final Exception e) {
104 LOGGER.warn("failed to execute Jython code for state finalizer " + getSubject().getKey(), e);
105 throw new StateMachineException(
106 "failed to execute Jython code for state finalizer " + getSubject().getKey(), e);
109 // Do the execution post work
110 executePost(returnValue);
112 // Send back the return event
114 return getOutgoing();
121 * Cleans up the state finalizer after processing.
123 * @throws StateMachineException thrown when a state machine execution error occurs
126 public void cleanUp() throws StateMachineException {
127 interpreter.cleanup();
128 LOGGER.debug("cleanUp:" + getSubject().getKey() + "," + getSubject().getLogicFlavour() + ","
129 + getSubject().getLogic());