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.javascript;
25 import javax.script.Compilable;
26 import javax.script.CompiledScript;
27 import javax.script.ScriptEngine;
28 import javax.script.ScriptEngineManager;
29 import javax.script.ScriptException;
31 import org.onap.policy.apex.context.ContextException;
32 import org.onap.policy.apex.core.engine.executor.TaskExecutor;
33 import org.onap.policy.apex.core.engine.executor.exception.StateMachineException;
34 import org.slf4j.ext.XLogger;
35 import org.slf4j.ext.XLoggerFactory;
38 * The Class JavascriptTaskExecutor is the task executor for task logic written in Javascript It is unlikely that this
41 * @author Liam Fallon (liam.fallon@ericsson.com)
43 public class JavascriptTaskExecutor extends TaskExecutor {
44 // Logger for this class
45 private static final XLogger LOGGER = XLoggerFactory.getXLogger(JavascriptTaskExecutor.class);
48 private ScriptEngine engine = new ScriptEngineManager().getEngineByName("JavaScript");
49 private CompiledScript compiled = null;
52 * Prepares the task for processing.
54 * @throws StateMachineException thrown when a state machine execution error occurs
57 public void prepare() throws StateMachineException {
58 // Call generic prepare logic
61 compiled = ((Compilable) engine).compile(getSubject().getTaskLogic().getLogic());
62 } catch (final ScriptException e) {
63 LOGGER.error("execute: task logic failed to compile for task \"" + getSubject().getKey().getId() + "\"");
64 throw new StateMachineException(
65 "task logic failed to compile for task \"" + getSubject().getKey().getId() + "\"", e);
70 * Executes the executor for the task in a sequential manner.
72 * @param executionId the execution ID for the current APEX policy execution
73 * @param incomingFields the incoming fields
74 * @return The outgoing fields
75 * @throws StateMachineException on an execution error
76 * @throws ContextException on context errors
79 public Map<String, Object> execute(final long executionId, final Map<String, Object> incomingFields)
80 throws StateMachineException, ContextException {
81 // Do execution pre work
82 executePre(executionId, incomingFields);
84 // Set up the Javascript engine
85 engine.put("executor", getExecutionContext());
87 // Check and execute the Javascript logic
88 boolean returnValue = false;
90 if (compiled == null) {
91 engine.eval(getSubject().getTaskLogic().getLogic());
93 compiled.eval(engine.getContext());
95 } catch (final ScriptException e) {
96 LOGGER.error("execute: task logic failed to run for task \"" + getSubject().getKey().getId() + "\"");
97 throw new StateMachineException(
98 "task logic failed to run for task \"" + getSubject().getKey().getId() + "\"", e);
102 final Object ret = engine.get("returnValue");
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("execute: task selection logic failed to set a return value for state \""
114 + getSubject().getKey().getId() + "\"", e);
117 // Do the execution post work
118 executePost(returnValue);
120 // Send back the return event
122 return getOutgoing();
129 * Cleans up the task after processing.
131 * @throws StateMachineException thrown when a state machine execution error occurs
134 public void cleanUp() throws StateMachineException {
135 LOGGER.debug("cleanUp:" + getSubject().getKey().getId() + "," + getSubject().getTaskLogic().getLogicFlavour()
136 + "," + getSubject().getTaskLogic().getLogic());