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;
28 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.event.EnEvent;
33 import org.onap.policy.apex.core.engine.executor.TaskSelectExecutor;
34 import org.onap.policy.apex.core.engine.executor.exception.StateMachineException;
35 import org.onap.policy.apex.model.basicmodel.concepts.AxArtifactKey;
36 import org.slf4j.ext.XLogger;
37 import org.slf4j.ext.XLoggerFactory;
40 * The Class MvelTaskSelectExecutor is the task selection executor for task selection logic written in MVEL.
42 * @author Liam Fallon (liam.fallon@ericsson.com)
44 public class MvelTaskSelectExecutor extends TaskSelectExecutor {
45 // Logger for this class
46 private static final XLogger LOGGER = XLoggerFactory.getXLogger(MvelTaskSelectExecutor.class);
49 private Serializable 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 // Compile the MVEL code
63 compiled = MVEL.compileExpression(getSubject().getTaskSelectionLogic().getLogic());
64 } catch (final Exception e) {
65 LOGGER.warn("failed to compile MVEL code for state " + getSubject().getKey().getId(), e);
66 throw new StateMachineException("failed to compile MVEL code for state " + getSubject().getKey().getId(),
72 * Executes the executor for the task in a sequential manner.
74 * @param executionId the execution ID for the current APEX policy execution
75 * @param executionProperties properties for the current APEX policy execution
76 * @param incomingEvent the incoming event
77 * @return The outgoing event
78 * @throws StateMachineException on an execution error
79 * @throws ContextException on context errors
82 public AxArtifactKey execute(final long executionId, final Properties executionProperties,
83 final EnEvent incomingEvent) throws StateMachineException, ContextException {
84 // Do execution pre work
85 executePre(executionId, executionProperties, incomingEvent);
87 // Check and execute the MVEL logic
88 argumentNotNull(compiled, "MVEL task not compiled.");
90 boolean returnValue = false;
92 // Execute the MVEL code
94 (boolean) MVEL.executeExpression(compiled, getExecutionContext(), new HashMap<String, Object>());
95 } catch (final Exception e) {
96 LOGGER.warn("failed to execute MVEL code for state " + getSubject().getKey().getId(), e);
97 throw new StateMachineException("failed to execute MVEL code for state " + getSubject().getKey().getId(),
101 // Do the execution post work
102 executePost(returnValue);
104 // Send back the return event
105 return getOutgoing();
109 * Cleans up the task after processing.
111 * @throws StateMachineException thrown when a state machine execution error occurs
114 public void cleanUp() throws StateMachineException {
115 LOGGER.debug("cleanUp:" + getSubject().getKey().getId() + ","
116 + getSubject().getTaskSelectionLogic().getLogicFlavour() + ","
117 + getSubject().getTaskSelectionLogic().getLogic());