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.mvel;
24 import static org.onap.policy.common.utils.validation.Assertions.argumentNotNull;
26 import java.io.Serializable;
27 import java.util.HashMap;
29 import java.util.Properties;
30 import org.mvel2.MVEL;
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 MvelTaskExecutor is the task executor for task logic written in MVEL.
40 * @author Liam Fallon (liam.fallon@ericsson.com)
42 public class MvelTaskExecutor extends TaskExecutor {
43 // Logger for this class
44 private static final XLogger LOGGER = XLoggerFactory.getXLogger(MvelTaskExecutor.class);
47 private Serializable 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 // Call generic prepare logic
59 // Compile the MVEL code
61 compiled = MVEL.compileExpression(getSubject().getTaskLogic().getLogic());
62 } catch (final Exception e) {
63 LOGGER.warn("failed to compile MVEL code for task " + getSubject().getKey().getId(), e);
64 throw new StateMachineException("failed to compile MVEL code for task " + getSubject().getKey().getId(), e);
66 argumentNotNull(compiled, "MVEL task not compiled.");
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 executionProperties properties for the current APEX policy execution
74 * @param incomingFields the incoming fields
75 * @return The outgoing fields
76 * @throws StateMachineException on an execution error
77 * @throws ContextException on context errors
80 public Map<String, Object> execute(final long executionId, final Properties executionProperties,
81 final Map<String, Object> incomingFields) throws StateMachineException, ContextException {
82 // Do execution pre work
83 executePre(executionId, executionProperties, incomingFields);
85 // Check and execute the MVEL logic
86 argumentNotNull(compiled, "MVEL task not compiled.");
87 boolean returnValue = false;
90 // Execute the MVEL code
92 (boolean) MVEL.executeExpression(compiled, getExecutionContext(), new HashMap<String, Object>());
93 } catch (final Exception e) {
94 LOGGER.warn("failed to execute MVEL code for task " + getSubject().getKey().getId(), e);
95 throw new StateMachineException("failed to execute MVEL code for task " + getSubject().getKey().getId(), e);
98 // Do the execution post work
99 executePost(returnValue);
101 // Send back the return event
102 return getOutgoing();
106 * Cleans up the task after processing.
108 * @throws StateMachineException thrown when a state machine execution error occurs
111 public void cleanUp() throws StateMachineException {
112 LOGGER.debug("cleanUp:" + getSubject().getKey().getId() + "," + getSubject().getTaskLogic().getLogicFlavour()
113 + "," + getSubject().getTaskLogic().getLogic());