package org.jbpm.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 );
}
@SuppressWarnings("unchecked")
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 ) {
System.out.println( "Different length: b1=" + b1.length + " b2=" + 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;
}
}