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/*-
* ============LICENSE_START=======================================================
* Copyright (C) 2020 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 org.graalvm.polyglot.Context;
import org.graalvm.polyglot.HostAccess;
import org.graalvm.polyglot.Value;
import org.onap.policy.apex.core.engine.executor.exception.StateMachineException;
import org.onap.policy.apex.model.basicmodel.concepts.AxKey;
/**
* The Class JavascriptExecutor is the executor for task logic written in Javascript.
*
* @author Liam Fallon (liam.fallon@ericsson.com)
*/
public class JavascriptExecutor {
// The key of the subject that wants to execute Javascript code
final AxKey subjectKey;
// The Javascript context
private final Context jsContext;
/**
* Prepares the executor for processing.
*
* @param subjectKey the key of the subject that is requesting Javascript execution
* @throws StateMachineException thrown when instantiation of the executor fails
*/
public JavascriptExecutor(final AxKey subjectKey) throws StateMachineException {
this.subjectKey = subjectKey;
// @formatter:off
jsContext =
Context.newBuilder("js")
.allowHostClassLookup(s -> true)
.allowHostAccess(HostAccess.ALL)
.build();
// @formatter:on
try {
jsContext.getBindings("js");
} catch (Exception e) {
jsContext.close();
throw new StateMachineException(
"prepare: javascript engine failed to initialize properly for \"" + subjectKey.getId() + "\"", e);
}
}
/**
* Executes the the Javascript code.
*
* @param executionContext the execution context of the subject to be passed to the Javascript context
* @param javascriptCode the Javascript code to execute
* @return true if the Javascript executed properly
* @throws StateMachineException thrown when Javascript execution fails
*/
public boolean execute(final Object executionContext, final String javascriptCode) throws StateMachineException {
try {
// Set up the Javascript engine context
jsContext.getBindings("js").putMember("executor", executionContext);
jsContext.eval("js", javascriptCode);
} catch (final Exception e) {
throw new StateMachineException("execute: logic failed to run for \"" + subjectKey.getId() + "\"", e);
}
Value returnValue = jsContext.getBindings("js").getMember("returnValue");
if (returnValue == null || returnValue.isNull()) {
throw new StateMachineException(
"execute: logic failed to set a return value for \"" + subjectKey.getId() + "\"");
}
return returnValue.asBoolean();
}
/**
* Cleans up the executor after processing.
*
* @throws StateMachineException thrown when cleanup of the executor fails
*/
public void cleanUp() throws StateMachineException {
try {
jsContext.close();
} catch (final Exception e) {
throw new StateMachineException(
"cleanUp: executor cleanup failed to close for \"" + subjectKey.getId() + "\"", e);
}
}
}
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