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/*-
* ============LICENSE_START=======================================================
* Copyright (C) 2016-2018 Ericsson. All rights reserved.
* Modifications Copyright (C) 2019 Nordix Foundation.
* ================================================================================
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* SPDX-License-Identifier: Apache-2.0
* ============LICENSE_END=========================================================
*/
package org.onap.policy.apex.plugins.executor.javascript;
import javax.script.Compilable;
import javax.script.CompiledScript;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
import javax.script.ScriptException;
import org.onap.policy.apex.context.ContextException;
import org.onap.policy.apex.core.engine.event.EnEvent;
import org.onap.policy.apex.core.engine.executor.TaskSelectExecutor;
import org.onap.policy.apex.core.engine.executor.exception.StateMachineException;
import org.onap.policy.apex.model.basicmodel.concepts.AxArtifactKey;
import org.slf4j.ext.XLogger;
import org.slf4j.ext.XLoggerFactory;
/**
* The Class JavascriptTaskSelectExecutor is the task selection executor for task selection logic
* written in Javascript It is unlikely that this is thread safe.
*
* @author Liam Fallon (liam.fallon@ericsson.com)
*/
public class JavascriptTaskSelectExecutor extends TaskSelectExecutor {
// Logger for this class
private static final XLogger LOGGER = XLoggerFactory.getXLogger(JavascriptTaskSelectExecutor.class);
// Recurring string constants
private static final String TSL_FAILED_PREFIX =
"execute: task selection logic failed to set a return value for state \"";
// Javascript engine
private ScriptEngine engine = new ScriptEngineManager().getEngineByName("JavaScript");
private CompiledScript compiled = null;
/**
* Prepares the task for processing.
*
* @throws StateMachineException thrown when a state machine execution error occurs
*/
@Override
public void prepare() throws StateMachineException {
// Call generic prepare logic
super.prepare();
try {
compiled = ((Compilable) engine).compile(getSubject().getTaskSelectionLogic().getLogic());
} catch (final ScriptException e) {
LOGGER.error("execute: task selection logic failed to compile for state \"" + getSubject().getKey().getId()
+ "\"");
throw new StateMachineException(
"task selection logic failed to compile for state \"" + getSubject().getKey().getId() + "\"", e);
}
}
/**
* Executes the executor for the task in a sequential manner.
*
* @param executionId the execution ID for the current APEX policy execution
* @param incomingEvent the incoming event
* @return The outgoing event
* @throws StateMachineException on an execution error
* @throws ContextException on context errors
*/
@Override
public AxArtifactKey execute(final long executionId, final EnEvent incomingEvent)
throws StateMachineException, ContextException {
// Do execution pre work
executePre(executionId, incomingEvent);
// Set up the Javascript engine
engine.put("executor", getExecutionContext());
// Check and execute the Javascript logic
try {
if (compiled == null) {
engine.eval(getSubject().getTaskSelectionLogic().getLogic());
} else {
compiled.eval(engine.getContext());
}
} catch (final ScriptException e) {
LOGGER.error(
"execute: task selection logic failed to run for state \"" + getSubject().getKey().getId() + "\"");
throw new StateMachineException(
"task selection logic failed to run for state \"" + getSubject().getKey().getId() + "\"", e);
}
final Object ret = engine.get("returnValue");
if (ret == null) {
LOGGER.error(TSL_FAILED_PREFIX + getSubject().getKey().getId() + "\"");
throw new StateMachineException(TSL_FAILED_PREFIX + getSubject().getKey().getId() + "\"");
}
// Do the execution post work
executePost((Boolean) ret);
return getOutgoing();
}
/**
* Cleans up the task after processing.
*
* @throws StateMachineException thrown when a state machine execution error occurs
*/
@Override
public void cleanUp() throws StateMachineException {
LOGGER.debug("cleanUp:" + getSubject().getKey().getId() + ","
+ getSubject().getTaskSelectionLogic().getLogicFlavour() + ","
+ getSubject().getTaskSelectionLogic().getLogic());
engine = null;
}
}
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