2 * ============LICENSE_START=======================================================
3 * Copyright (C) 2016-2018 Ericsson. All rights reserved.
4 * Modifications Copyright (C) 2019 Nordix Foundation.
5 * ================================================================================
6 * Licensed under the Apache License, Version 2.0 (the "License");
7 * you may not use this file except in compliance with the License.
8 * You may obtain a copy of the License at
10 * http://www.apache.org/licenses/LICENSE-2.0
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
18 * SPDX-License-Identifier: Apache-2.0
19 * ============LICENSE_END=========================================================
22 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;
30 import org.onap.policy.apex.context.ContextException;
31 import org.onap.policy.apex.core.engine.executor.TaskExecutor;
32 import org.onap.policy.apex.core.engine.executor.exception.StateMachineException;
33 import org.slf4j.ext.XLogger;
34 import org.slf4j.ext.XLoggerFactory;
37 * The Class JavascriptTaskExecutor is the task executor for task logic written in Javascript It is
38 * unlikely that this is thread safe.
40 * @author Liam Fallon (liam.fallon@ericsson.com)
42 public class JavascriptTaskExecutor extends TaskExecutor {
43 // Logger for this class
44 private static final XLogger LOGGER = XLoggerFactory.getXLogger(JavascriptTaskExecutor.class);
47 private ScriptEngine engine = new ScriptEngineManager().getEngineByName("JavaScript");
48 private CompiledScript 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 // Call generic prepare logic
60 compiled = ((Compilable) engine).compile(getSubject().getTaskLogic().getLogic());
61 } catch (final ScriptException e) {
62 LOGGER.error("execute: task logic failed to compile for task \"" + getSubject().getKey().getId() + "\"");
63 throw new StateMachineException(
64 "task logic failed to compile for task \"" + getSubject().getKey().getId() + "\"", e);
69 * Executes the executor for the task in a sequential manner.
71 * @param executionId the execution ID 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 Map<String, Object> incomingFields)
79 throws StateMachineException, ContextException {
80 // Do execution pre work
81 executePre(executionId, incomingFields);
83 // Set up the Javascript engine
84 engine.put("executor", getExecutionContext());
86 // Check and execute the Javascript logic
88 if (compiled == null) {
89 engine.eval(getSubject().getTaskLogic().getLogic());
91 compiled.eval(engine.getContext());
93 } catch (final ScriptException e) {
94 LOGGER.error("execute: task logic failed to run for task \"" + getSubject().getKey().getId() + "\"");
95 throw new StateMachineException(
96 "task logic failed to run for task \"" + getSubject().getKey().getId() + "\"", e);
99 final Object ret = engine.get("returnValue");
101 LOGGER.error("execute: task logic failed to set a return value for task \"" + getSubject().getKey().getId()
103 throw new StateMachineException("execute: task logic failed to set a return value for task \""
104 + getSubject().getKey().getId() + "\"");
107 // Do the execution post work
108 executePost((Boolean) ret);
110 return getOutgoing();
114 * Cleans up the task after processing.
116 * @throws StateMachineException thrown when a state machine execution error occurs
119 public void cleanUp() throws StateMachineException {
120 LOGGER.debug("cleanUp:" + getSubject().getKey().getId() + "," + getSubject().getTaskLogic().getLogicFlavour()
121 + "," + getSubject().getTaskLogic().getLogic());