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/**
* Copyright (C) 2019 Bonitasoft S.A.
* Bonitasoft, 32 rue Gustave Eiffel - 38000 Grenoble
* This library is free software; you can redistribute it and/or modify it under the terms
* of the GNU Lesser General Public License as published by the Free Software Foundation
* version 2.1 of the License.
* This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU Lesser General Public License for more details.
* You should have received a copy of the GNU Lesser General Public License along with this
* program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth
* Floor, Boston, MA 02110-1301, USA.
**/
package org.bonitasoft.engine.expression.impl;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.Map;
import groovy.lang.Binding;
import groovy.lang.GroovyCodeSource;
import groovy.lang.GroovyRuntimeException;
import groovy.lang.GroovyShell;
import groovy.lang.MissingPropertyException;
import groovy.lang.Script;
import org.bonitasoft.engine.cache.CacheService;
import org.bonitasoft.engine.cache.SCacheException;
import org.bonitasoft.engine.classloader.ClassLoaderListener;
import org.bonitasoft.engine.classloader.ClassLoaderService;
import org.bonitasoft.engine.classloader.SClassLoaderException;
import org.bonitasoft.engine.commons.exceptions.SBonitaRuntimeException;
import org.bonitasoft.engine.expression.ContainerState;
import org.bonitasoft.engine.expression.exception.SExpressionEvaluationException;
import org.bonitasoft.engine.expression.model.SExpression;
import org.bonitasoft.engine.log.technical.TechnicalLogSeverity;
import org.bonitasoft.engine.log.technical.TechnicalLoggerService;
import org.codehaus.groovy.runtime.InvokerHelper;
/**
* @author Zhao na
* @author Baptiste Mesta
* @author Matthieu Chaffotte
* @author Celine Souchet
*/
public class GroovyScriptExpressionExecutorCacheStrategy extends AbstractGroovyScriptExpressionExecutorStrategy
implements ClassLoaderListener {
public static final String GROOVY_SCRIPT_CACHE_NAME = "GROOVY_SCRIPT_CACHE_NAME";
public static final String SCRIPT_KEY = "SCRIPT_";
public static final String SHELL_KEY = "SHELL_";
private final CacheService cacheService;
private final ClassLoaderService classLoaderService;
private final TechnicalLoggerService logger;
private static int counter;
public GroovyScriptExpressionExecutorCacheStrategy(final CacheService cacheService,
final ClassLoaderService classLoaderService,
final TechnicalLoggerService logger) {
this.cacheService = cacheService;
this.classLoaderService = classLoaderService;
this.logger = logger;
}
protected synchronized String generateScriptName() {
return "BScript" + (++counter) + ".groovy";
}
Class getScriptFromCache(final String expressionContent, final Long definitionId)
throws SCacheException, SClassLoaderException {
if (definitionId == null) {
throw new SBonitaRuntimeException("Unable to evaluate expression without a definitionId");
}
final GroovyShell shell = getShell(definitionId);
final String key = getScriptKey(expressionContent);
GroovyCodeSource gcs = (GroovyCodeSource) cacheService.get(GROOVY_SCRIPT_CACHE_NAME, key);
if (gcs == null) {
gcs = AccessController.doPrivileged(new PrivilegedAction() {
public GroovyCodeSource run() {
return new GroovyCodeSource(expressionContent, generateScriptName(), GroovyShell.DEFAULT_CODE_BASE);
}
});
cacheService.store(GROOVY_SCRIPT_CACHE_NAME, key, gcs);
}
// parse the groovy source code with cache set to true
return shell.getClassLoader().parseClass(gcs, true);
}
private String getScriptKey(String expressionContent) {
return SCRIPT_KEY + expressionContent.hashCode();
}
GroovyShell getShell(final Long definitionId) throws SClassLoaderException, SCacheException {
String key = SHELL_KEY + definitionId;
GroovyShell shell = (GroovyShell) cacheService.get(GROOVY_SCRIPT_CACHE_NAME, key);
if (shell == null) {
ClassLoader classLoader = getClassLoaderForShell(definitionId);
if (logger.isLoggable(this.getClass(), TechnicalLogSeverity.DEBUG)) {
logger.log(this.getClass(), TechnicalLogSeverity.DEBUG,
"Create a new groovy classloader for " + definitionId + " " + classLoader);
}
shell = new GroovyShell(classLoader);
cacheService.store(GROOVY_SCRIPT_CACHE_NAME, key, shell);
}
return shell;
}
private ClassLoader getClassLoaderForShell(Long definitionId) throws SClassLoaderException {
ClassLoader classLoader;
if (definitionId == null) {
classLoader = Thread.currentThread().getContextClassLoader();
//do not has listener, should not happen...
if (logger.isLoggable(this.getClass(), TechnicalLogSeverity.DEBUG)) {
IllegalStateException illegalStateException = new IllegalStateException();
logger.log(this.getClass(), TechnicalLogSeverity.DEBUG,
"Creating a shell without definition id, might cause issue when reloading classes",
illegalStateException);
}
} else {
classLoader = classLoaderService.getLocalClassLoader(DEFINITION_TYPE, definitionId);
classLoaderService.addListener(DEFINITION_TYPE, definitionId, this);
}
return classLoader;
}
@Override
public Object evaluate(final SExpression expression, final Map context,
final Map resolvedExpressions,
final ContainerState containerState) throws SExpressionEvaluationException {
final String expressionContent = expression.getContent();
final String expressionName = expression.getName();
try {
final Binding binding = new Binding(context);
final Script script = InvokerHelper
.createScript(getScriptFromCache(expressionContent, (Long) context.get(DEFINITION_ID)), binding);
script.setBinding(binding);
return script.run();
} catch (final MissingPropertyException e) {
final String property = e.getProperty();
throw new SExpressionEvaluationException("Expression " + expressionName + " with content = <"
+ expressionContent + "> depends on " + property
+ " is neither defined in the script nor in dependencies.", e, expressionName);
} catch (final GroovyRuntimeException e) {
throw new SExpressionEvaluationException(e, expressionName);
} catch (final SCacheException e) {
throw new SExpressionEvaluationException(
"Problem accessing the Script Cache from GroovyScriptExpressionExecutorCacheStrategy.", e,
expressionName);
} catch (final SClassLoaderException e) {
throw new SExpressionEvaluationException(
"Unable to retrieve the correct classloader to execute the groovy script : " + expression, e,
expressionName);
} catch (final Throwable e) {
//catch throwable because we do not handle contents of scripts
String message = e.getMessage();
if (message == null || message.isEmpty()) {
message = "No message";
}
throw new SExpressionEvaluationException(
"Groovy script throws an exception of type " + e.getClass() + " with message = " + message
+ System.getProperty("line.separator") + "Expression : " + expression,
e, expressionName);
}
}
@Override
public void onUpdate(ClassLoader newClassLoader) {
clearCache();
}
private void clearCache() {
try {
cacheService.clear(GROOVY_SCRIPT_CACHE_NAME);
} catch (SCacheException e) {
logger.log(getClass(), TechnicalLogSeverity.ERROR,
"error while clearing the cache of the groovy script executor strategy, you might have classloading issue, restart the server if it's the case",
e);
}
}
@Override
public void onDestroy(ClassLoader oldClassLoader) {
clearCache();
}
}
