package org.drools.compiler.integrationtests;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectOutput;
import java.io.ObjectOutputStream;
import org.drools.core.RuleBase;
import org.drools.core.SessionConfiguration;
import org.drools.core.StatefulSession;
import org.drools.core.common.AbstractWorkingMemory;
import org.drools.core.impl.KnowledgeBaseImpl;
import org.drools.core.impl.StatefulKnowledgeSessionImpl;
import org.drools.core.reteoo.ReteooRuleBase;
import org.drools.core.util.DroolsStreamUtils;
import org.drools.core.marshalling.impl.ProtobufMarshaller;
import org.kie.internal.marshalling.MarshallerFactory;
import org.kie.internal.runtime.StatefulKnowledgeSession;
import org.kie.api.marshalling.ObjectMarshallingStrategy;
import org.kie.api.runtime.EnvironmentName;
import org.kie.api.time.SessionClock;
/**
* 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 );
}
/**
* @deprecated This method can't handle serialization of globals to a deficiency of the API.
* Please use getSerialisedStatefulKnowledgeSession() instead.
*/
@Deprecated
public static StatefulSession getSerialisedStatefulSession(StatefulSession session) throws Exception {
return getSerialisedStatefulSession( session,
true );
}
/**
* @deprecated This method can't handle serialization of globals to a deficiency of the API.
* Please use getSerialisedStatefulKnowledgeSession() instead.
*/
@Deprecated
public static StatefulSession getSerialisedStatefulSession(StatefulSession session,
RuleBase ruleBase) throws Exception {
return getSerialisedStatefulSession( session,
ruleBase,
true );
}
/**
* @deprecated This method can't handle serialization of globals to a deficiency of the API.
* Please use getSerialisedStatefulKnowledgeSession() instead.
*/
@Deprecated
public static StatefulSession getSerialisedStatefulSession(StatefulSession session,
boolean dispose) throws Exception {
return getSerialisedStatefulSession( session,
session.getRuleBase(),
dispose );
}
/**
* @deprecated This method can't handle serialization of globals to a deficiency of the API.
* Please use getSerialisedStatefulKnowledgeSession() instead.
*/
@Deprecated
public static StatefulSession getSerialisedStatefulSession(StatefulSession session,
RuleBase ruleBase,
boolean dispose) throws Exception {
// Serialize to a byte array
ByteArrayOutputStream bos = new ByteArrayOutputStream();
((AbstractWorkingMemory)session).getTimerService();
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();
// Reserialize and check that byte arrays are the same
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 {
if ( ((ReteooRuleBase)((KnowledgeBaseImpl) (ksession.getKieBase())).getRuleBase()).getConfiguration().isPhreakEnabled() ) {
return ksession;
}
return getSerialisedStatefulKnowledgeSession( ksession,
dispose,
true );
}
public static StatefulKnowledgeSession getSerialisedStatefulKnowledgeSession(StatefulKnowledgeSession ksession,
boolean dispose,
boolean testRoundTrip ) throws Exception {
if ( ((ReteooRuleBase)((KnowledgeBaseImpl) (ksession.getKieBase())).getRuleBase()).getConfiguration().isPhreakEnabled() ) {
return ksession;
}
ProtobufMarshaller marshaller = (ProtobufMarshaller) MarshallerFactory.newMarshaller( ksession.getKieBase(),
(ObjectMarshallingStrategy[])ksession.getEnvironment().get(EnvironmentName.OBJECT_MARSHALLING_STRATEGIES) );
long time = ksession.<SessionClock>getSessionClock().getCurrentTime();
// make sure globas are in the environment of the session
ksession.getEnvironment().set( EnvironmentName.GLOBALS, ksession.getGlobals() );
// Serialize object
final byte [] b1;
{
ByteArrayOutputStream bos = new ByteArrayOutputStream();
marshaller.marshall( bos,
ksession,
time );
b1 = bos.toByteArray();
bos.close();
}
// Deserialize object
StatefulKnowledgeSession ksession2;
{
ByteArrayInputStream bais = new ByteArrayInputStream( b1 );
ksession2 = marshaller.unmarshall( bais,
new SessionConfiguration(),
ksession.getEnvironment());
bais.close();
}
if( testRoundTrip ) {
// for now, we can ensure the IDs will match because queries are creating untraceable fact handles at the moment
// int previous_id = ((StatefulKnowledgeSessionImpl)ksession).session.getFactHandleFactory().getId();
// long previous_recency = ((StatefulKnowledgeSessionImpl)ksession).session.getFactHandleFactory().getRecency();
// int current_id = ((StatefulKnowledgeSessionImpl)ksession2).session.getFactHandleFactory().getId();
// long current_recency = ((StatefulKnowledgeSessionImpl)ksession2).session.getFactHandleFactory().getRecency();
// ((StatefulKnowledgeSessionImpl)ksession2).session.getFactHandleFactory().clear( previous_id, previous_recency );
// Reserialize and check that byte arrays are the same
final byte[] b2;
{
ByteArrayOutputStream bos = new ByteArrayOutputStream();
marshaller.marshall( bos,
ksession2,
time );
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.getFactHandleFactory().clear( current_id, current_recency );
// ((StatefulKnowledgeSessionImpl) ksession2).session.setGlobalResolver( ((StatefulKnowledgeSessionImpl) ksession).session.getGlobalResolver() );
}
if ( dispose ) {
ksession.dispose();
}
return ksession2;
}
private 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;
}
// System.out.println( "b1" );
// for ( int i = 0, length = b1.length; i < length; i++ ) {
// if ( i == 81 ) {
// System.out.print( "!" );
// }
// System.out.print( b1[i] );
// if ( i == 83 ) {
// System.out.print( "!" );
// }
// }
//
// System.out.println( "\nb2" );
// for ( int i = 0, length = b2.length; i < length; i++ ) {
// if ( i == 81 ) {
// System.out.print( "!" );
// }
// System.out.print( b2[i] );
// if ( i == 83 ) {
// System.out.print( "!" );
// }
// }
boolean result = true;
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] + "]" );
result = false;
}
}
return result;
}
}