package org.drools.persistence.processinstance;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.Arrays;
import java.util.Date;
import java.util.HashSet;
import java.util.Set;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.JoinTable;
import javax.persistence.Lob;
import javax.persistence.PreUpdate;
import javax.persistence.Transient;
import javax.persistence.Version;
import org.drools.common.InternalKnowledgeRuntime;
import org.drools.common.InternalRuleBase;
import org.drools.impl.InternalKnowledgeBase;
import org.drools.impl.StatefulKnowledgeSessionImpl;
import org.drools.marshalling.impl.MarshallerReaderContext;
import org.drools.marshalling.impl.MarshallerWriteContext;
import org.drools.marshalling.impl.ProcessInstanceMarshaller;
import org.drools.marshalling.impl.ProcessMarshallerRegistry;
import org.drools.process.instance.impl.ProcessInstanceImpl;
import org.drools.runtime.Environment;
import org.drools.runtime.process.ProcessInstance;
import org.drools.workflow.instance.impl.WorkflowProcessInstanceImpl;
import org.hibernate.annotations.CollectionOfElements;
@Entity
public class ProcessInstanceInfo {
private static final String VARIABLE_SEPARATOR = ":";
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
@Column(name = "InstanceId")
private Long processInstanceId;
@Version
@Column(name = "OPTLOCK")
private int version;
private String processId;
private Date startDate;
private Date lastReadDate;
private Date lastModificationDate;
private int state;
// TODO How do I mark a process instance info as dirty when the process
// instance has changed (so that byte array is regenerated and saved) ?
private @Lob
byte[] processInstanceByteArray;
// @OneToMany(cascade = {CascadeType.PERSIST, CascadeType.MERGE})
// @JoinColumn(name = "processInstanceId")
// private Set<EventType> eventTypes = new HashSet<EventType>();
private @CollectionOfElements
@JoinTable(name = "EventTypes", joinColumns = @JoinColumn(name = "InstanceId"))
Set<String> eventTypes = new HashSet<String>();
private @Transient
ProcessInstance processInstance;
private @Transient
Environment env;
protected ProcessInstanceInfo() {
}
public ProcessInstanceInfo(ProcessInstance processInstance) {
this.processInstance = processInstance;
this.processId = processInstance.getProcessId();
startDate = new Date();
}
public ProcessInstanceInfo(ProcessInstance processInstance,
Environment env) {
this.processInstance = processInstance;
this.processId = processInstance.getProcessId();
startDate = new Date();
this.env = env;
}
public long getId() {
return processInstanceId;
}
public String getProcessId() {
return processId;
}
public Date getStartDate() {
return startDate;
}
public Date getLastModificationDate() {
return lastModificationDate;
}
public Date getLastReadDate() {
return lastReadDate;
}
public void updateLastReadDate() {
lastReadDate = new Date();
}
public int getState() {
return state;
}
public ProcessInstance getProcessInstance(InternalKnowledgeRuntime kruntime,
Environment env) {
this.env = env;
if ( processInstance == null ) {
try {
ByteArrayInputStream bais = new ByteArrayInputStream( processInstanceByteArray );
MarshallerReaderContext context = new MarshallerReaderContext( bais,
(InternalRuleBase) ((InternalKnowledgeBase) kruntime.getKnowledgeBase()).getRuleBase(),
null,
null,
this.env
);
ProcessInstanceMarshaller marshaller = getMarshallerFromContext( context );
context.wm = ((StatefulKnowledgeSessionImpl) kruntime).getInternalWorkingMemory();
processInstance = marshaller.readProcessInstance(context);
context.close();
} catch ( IOException e ) {
e.printStackTrace();
throw new IllegalArgumentException( "IOException while loading process instance: " + e.getMessage(),
e );
}
}
return processInstance;
}
private ProcessInstanceMarshaller getMarshallerFromContext(MarshallerReaderContext context) throws IOException {
ObjectInputStream stream = context.stream;
String processInstanceType = stream.readUTF();
return ProcessMarshallerRegistry.INSTANCE.getMarshaller( processInstanceType );
}
private void saveProcessInstanceType(MarshallerWriteContext context,
ProcessInstance processInstance,
String processInstanceType) throws IOException {
ObjectOutputStream stream = context.stream;
// saves the processInstance type first
stream.writeUTF( processInstanceType );
}
@PreUpdate
public void update() {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
boolean variablesChanged = false;
try {
MarshallerWriteContext context = new MarshallerWriteContext( baos,
null,
null,
null,
null,
this.env );
String processType = ((ProcessInstanceImpl) processInstance).getProcess().getType();
saveProcessInstanceType( context,
processInstance,
processType );
ProcessInstanceMarshaller marshaller = ProcessMarshallerRegistry.INSTANCE.getMarshaller( processType );
marshaller.writeProcessInstance( context,
processInstance);
context.close();
} catch ( IOException e ) {
throw new IllegalArgumentException( "IOException while storing process instance " + processInstance.getId() + ": " + e.getMessage() );
}
byte[] newByteArray = baos.toByteArray();
if ( variablesChanged || !Arrays.equals( newByteArray,
processInstanceByteArray ) ) {
this.state = processInstance.getState();
this.lastModificationDate = new Date();
this.processInstanceByteArray = newByteArray;
this.eventTypes.clear();
for ( String type : processInstance.getEventTypes() ) {
eventTypes.add( type );
}
}
}
@Override
public boolean equals(Object obj) {
if ( obj == null ) {
return false;
}
if ( getClass() != obj.getClass() ) {
return false;
}
final ProcessInstanceInfo other = (ProcessInstanceInfo) obj;
if ( this.processInstanceId != other.processInstanceId && (this.processInstanceId == null || !this.processInstanceId.equals( other.processInstanceId )) ) {
return false;
}
if ( this.version != other.version ) {
return false;
}
if ( (this.processId == null) ? (other.processId != null) : !this.processId.equals( other.processId ) ) {
return false;
}
if ( this.startDate != other.startDate && (this.startDate == null || !this.startDate.equals( other.startDate )) ) {
return false;
}
if ( this.lastReadDate != other.lastReadDate && (this.lastReadDate == null || !this.lastReadDate.equals( other.lastReadDate )) ) {
return false;
}
if ( this.lastModificationDate != other.lastModificationDate && (this.lastModificationDate == null || !this.lastModificationDate.equals( other.lastModificationDate )) ) {
return false;
}
if ( this.state != other.state ) {
return false;
}
if ( !Arrays.equals( this.processInstanceByteArray,
other.processInstanceByteArray ) ) {
return false;
}
if ( this.eventTypes != other.eventTypes && (this.eventTypes == null || !this.eventTypes.equals( other.eventTypes )) ) {
return false;
}
if ( this.processInstance != other.processInstance && (this.processInstance == null || !this.processInstance.equals( other.processInstance )) ) {
return false;
}
if ( this.env != other.env && (this.env == null || !this.env.equals( other.env )) ) {
return false;
}
return true;
}
@Override
public int hashCode() {
int hash = 7;
hash = 61 * hash + (this.processInstanceId != null ? this.processInstanceId.hashCode() : 0);
hash = 61 * hash + this.version;
hash = 61 * hash + (this.processId != null ? this.processId.hashCode() : 0);
hash = 61 * hash + (this.startDate != null ? this.startDate.hashCode() : 0);
hash = 61 * hash + (this.lastReadDate != null ? this.lastReadDate.hashCode() : 0);
hash = 61 * hash + (this.lastModificationDate != null ? this.lastModificationDate.hashCode() : 0);
hash = 61 * hash + this.state;
hash = 61 * hash + Arrays.hashCode( this.processInstanceByteArray );
hash = 61 * hash + (this.eventTypes != null ? this.eventTypes.hashCode() : 0);
hash = 61 * hash + (this.processInstance != null ? this.processInstance.hashCode() : 0);
hash = 61 * hash + (this.env != null ? this.env.hashCode() : 0);
return hash;
}
}