/**
* Copyright 2010 JBoss Inc
*
* 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.
*/
package org.drools.integrationtests;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectOutput;
import java.io.ObjectOutputStream;
import org.drools.RuleBase;
import org.drools.SessionConfiguration;
import org.drools.StatefulSession;
import org.drools.core.util.DroolsStreamUtils;
import org.drools.impl.EnvironmentFactory;
import org.drools.impl.StatefulKnowledgeSessionImpl;
import org.drools.marshalling.Marshaller;
import org.drools.marshalling.MarshallerFactory;
import org.drools.marshalling.ObjectMarshallingStrategy;
import org.drools.runtime.StatefulKnowledgeSession;
/**
* Marshalling helper class to perform serialize/de-serialize a given object
*/
public class SerializationHelper {
public static <T> T serializeObject(T obj) throws IOException,
ClassNotFoundException {
return serializeObject( obj,
null );
}
public static <T> T serializeObject(T obj,
ClassLoader classLoader) throws IOException,
ClassNotFoundException {
return (T) DroolsStreamUtils.streamIn( DroolsStreamUtils.streamOut( obj ),
classLoader );
}
public static StatefulSession getSerialisedStatefulSession(StatefulSession session) throws Exception {
return getSerialisedStatefulSession( session,
true );
}
public static StatefulSession getSerialisedStatefulSession(StatefulSession session,
RuleBase ruleBase) throws Exception {
return getSerialisedStatefulSession( session,
ruleBase,
true );
}
public static StatefulSession getSerialisedStatefulSession(StatefulSession session,
boolean dispose) throws Exception {
return getSerialisedStatefulSession( session,
session.getRuleBase(),
dispose );
}
public static StatefulSession getSerialisedStatefulSession(StatefulSession session,
RuleBase ruleBase,
boolean dispose) throws Exception {
// Serialize to a byte array
ByteArrayOutputStream bos = new ByteArrayOutputStream();
ObjectOutput out = new ObjectOutputStream( bos );
out.writeObject( session );
out.close();
bos.close();
// Get the bytes of the serialized object
final byte[] b1 = bos.toByteArray();
ByteArrayInputStream bais = new ByteArrayInputStream( b1 );
StatefulSession session2 = ruleBase.newStatefulSession( bais );
bais.close();
bos = new ByteArrayOutputStream();
out = new ObjectOutputStream( bos );
out.writeObject( session2 );
out.close();
bos.close();
final byte[] b2 = bos.toByteArray();
// bytes should be the same.
if ( !areByteArraysEqual( b1,
b2 ) ) {
throw new IllegalArgumentException( "byte streams for serialisation test are not equal" );
}
session2.setGlobalResolver( session.getGlobalResolver() );
if ( dispose ) {
session.dispose();
}
return session2;
}
public static StatefulKnowledgeSession getSerialisedStatefulKnowledgeSession(StatefulKnowledgeSession ksession,
boolean dispose) throws Exception {
return getSerialisedStatefulKnowledgeSession( ksession, MarshallerFactory.newSerializeMarshallingStrategy(), dispose);
}
public static StatefulKnowledgeSession getSerialisedStatefulKnowledgeSession(StatefulKnowledgeSession ksession,
ObjectMarshallingStrategy strategy,
boolean dispose) throws Exception {
Marshaller marshaller = MarshallerFactory.newMarshaller( ksession.getKnowledgeBase(), new ObjectMarshallingStrategy[]{ strategy } );
ByteArrayOutputStream bos = new ByteArrayOutputStream();
marshaller.marshall( bos,
ksession );
final byte[] b1 = bos.toByteArray();
bos.close();
ByteArrayInputStream bais = new ByteArrayInputStream( b1 );
StatefulKnowledgeSession ksession2 = marshaller.unmarshall( bais,
new SessionConfiguration(),
EnvironmentFactory.newEnvironment() );
bais.close();
bos = new ByteArrayOutputStream();
marshaller.marshall( bos,
ksession2 );
final byte[] b2 = bos.toByteArray();
bos.close();
// bytes should be the same.
if ( !areByteArraysEqual( b1,
b2 ) ) {
throw new IllegalArgumentException( "byte streams for serialisation test are not equal" );
}
((StatefulKnowledgeSessionImpl) ksession2).session.setGlobalResolver( ((StatefulKnowledgeSessionImpl) ksession).session.getGlobalResolver() );
if ( dispose ) {
ksession.dispose();
}
return ksession2;
}
public static boolean areByteArraysEqual(byte[] b1,
byte[] b2) {
if ( b1.length != b2.length ) {
return false;
}
for ( int i = 0, length = b1.length; i < length; i++ ) {
if ( b1[i] != b2[i] ) {
System.out.println("Difference at "+i+": ["+b1[i]+"] != ["+b2[i]+"]");
return false;
}
}
return true;
}
}