org.springframework.webflow.execution.repository.snapshot
Class SerializedFlowExecutionSnapshot

java.lang.Object
  org.springframework.webflow.execution.repository.snapshot.FlowExecutionSnapshot
      org.springframework.webflow.execution.repository.snapshot.SerializedFlowExecutionSnapshot

All Implemented Interfaces:

java.io.Externalizable, java.io.Serializable

public class SerializedFlowExecutionSnapshot
extends FlowExecutionSnapshot
implements java.io.Externalizable

A snapshot implementation that is based on standard Java serialization, created by a SerializedFlowExecutionSnapshotFactory.

Author:

Keith Donald, Erwin Vervaet

See Also:

SerializedFlowExecutionSnapshotFactory, Serialized Form

Constructor Summary

SerializedFlowExecutionSnapshot()
Default constructor necessary for Externalizable custom serialization semantics.

SerializedFlowExecutionSnapshot(FlowExecution flowExecution, boolean compress)
Creates a new serialized flow execution snapshot.

Method Summary

protected byte[]	compress(byte[] dataToCompress) Internal helper method to compress given flow execution data using GZIP compression.
protected byte[]	decompress(byte[] dataToDecompress) Internal helper method to decompress given flow execution data using GZIP decompression.
protected FlowExecution	deserialize(byte[] data, java.lang.ClassLoader classLoader) Internal helper method to deserialize given flow execution data.
boolean	equals(java.lang.Object o)
protected byte[]	getFlowExecutionData() Return the flow execution data in its raw byte[] form.
int	hashCode()
boolean	isCompressed() Returns whether or not the flow execution data in this snapshot is compressed.
void	readExternal(java.io.ObjectInput in)
protected byte[]	serialize(FlowExecution flowExecution) Internal helper method to serialize given flow execution.
FlowExecution	unmarshal(java.lang.ClassLoader classLoader) Unmarshal the flow execution from this snapshot's data.
void	writeExternal(java.io.ObjectOutput out)

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

SerializedFlowExecutionSnapshot

public SerializedFlowExecutionSnapshot()

Default constructor necessary for Externalizable custom serialization semantics. Should not be called by application code.

SerializedFlowExecutionSnapshot

public SerializedFlowExecutionSnapshot(FlowExecution flowExecution,
                                       boolean compress)
                                throws SnapshotCreationException

Creates a new serialized flow execution snapshot.

Parameters:

flowExecution - the flow execution

compress - whether or not to apply compression during snapshotting

Throws:

SnapshotCreationException

Method Detail

isCompressed

public boolean isCompressed()

Returns whether or not the flow execution data in this snapshot is compressed.

unmarshal

public FlowExecution unmarshal(java.lang.ClassLoader classLoader)
                        throws SnapshotUnmarshalException

Unmarshal the flow execution from this snapshot's data.

Parameters:

classLoader - the classloader to use to resolve types during execution deserialization

Returns:

the unmarashalled flow execution

Throws:

SnapshotUnmarshalException

equals

public boolean equals(java.lang.Object o)

Overrides:

equals in class java.lang.Object

hashCode

public int hashCode()

Overrides:

hashCode in class java.lang.Object

writeExternal

public void writeExternal(java.io.ObjectOutput out)
                   throws java.io.IOException

Specified by:

writeExternal in interface java.io.Externalizable

Throws:

java.io.IOException

readExternal

public void readExternal(java.io.ObjectInput in)
                  throws java.io.IOException,
                         java.lang.ClassNotFoundException

Specified by:

readExternal in interface java.io.Externalizable

Throws:

java.io.IOException

java.lang.ClassNotFoundException

getFlowExecutionData

protected byte[] getFlowExecutionData()
                               throws java.io.IOException

Return the flow execution data in its raw byte[] form. Will decompress if necessary.

Returns:

the byte array

Throws:

java.io.IOException - a problem occured with decompression

serialize

protected byte[] serialize(FlowExecution flowExecution)
                    throws java.io.IOException

Internal helper method to serialize given flow execution. Override if a custom serialization method is used.

Parameters:

flowExecution - flow execution to serialize

Returns:

serialized flow flow execution data

Throws:

java.io.IOException - when something goes wrong during during serialization

deserialize

protected FlowExecution deserialize(byte[] data,
                                    java.lang.ClassLoader classLoader)
                             throws java.io.IOException,
                                    java.lang.ClassNotFoundException

Internal helper method to deserialize given flow execution data. Override if a custom serialization method is used.

Parameters:

data - serialized flow flow execution data

classLoader - the class loader to use to resolve classes during deserialization

Returns:

deserialized flow execution

Throws:

java.io.IOException - when something goes wrong during deserialization

java.lang.ClassNotFoundException - when required classes cannot be loaded

compress

protected byte[] compress(byte[] dataToCompress)
                   throws java.io.IOException

Internal helper method to compress given flow execution data using GZIP compression. Override if custom compression is desired.

Throws:

java.io.IOException

decompress

protected byte[] decompress(byte[] dataToDecompress)
                     throws java.io.IOException

Internal helper method to decompress given flow execution data using GZIP decompression. Override if custom decompression is desired.

Throws:

java.io.IOException