org.infinispan.marshall.core

Class VersionAwareMarshaller

java.lang.Object

org.infinispan.commons.marshall.AbstractMarshaller

org.infinispan.marshall.core.VersionAwareMarshaller

All Implemented Interfaces:

Marshaller, StreamingMarshaller

Direct Known Subclasses:

VersionAwareMarshaller

public class VersionAwareMarshaller
extends AbstractMarshaller
implements StreamingMarshaller

A delegate to various other marshallers like JBossMarshaller. This delegating marshaller adds versioning information to the stream when marshalling objects and is able to pick the appropriate marshaller to delegate to based on the versioning information when unmarshalling objects.

Since:

4.0

Author:

Manik Surtani, Galder Zamarreño

Field Summary

Fields inherited from class org.infinispan.commons.marshall.AbstractMarshaller

marshallableTypeHints

Constructor Summary

Constructors

Constructor and Description
VersionAwareMarshaller()

Method Summary

Methods

Modifier and Type	Method and Description
void	finishObjectInput(ObjectInput oi) Finish using the given ObjectInput.
void	finishObjectOutput(ObjectOutput oo) Finish using the given ObjectOutput.
String	getCacheName()
void	inject(Cache cache, Configuration cfg, InvocationContextContainer icc, ExternalizerTable extTable, GlobalConfiguration globalCfg)
boolean	isMarshallable(Object o) A method that checks whether the given object is marshallable as per the rules of this marshaller.
Object	objectFromByteBuffer(byte[] bytes, int offset, int len) Unmarshalls an object from a specific portion of a byte array.
Object	objectFromObjectStream(ObjectInput in) Unmarshalls an object from an ObjectInput
protected ByteBuffer	objectToBuffer(Object obj, int estimatedSize) This is a convenience method for converting an object into a org.infinispan.io.ByteBuffer which takes an estimated size as parameter.
void	objectToObjectStream(Object obj, ObjectOutput out) Marshalls an object to a given ObjectOutput
void	start()
ObjectInput	startObjectInput(InputStream is, boolean isReentrant) Create and open a new ObjectInput for the given input stream.
ObjectOutput	startObjectOutput(OutputStream os, boolean isReentrant, int estimatedSize) Create and open an ObjectOutput instance for the given output stream.
void	stop() Stop the marshaller.

Methods inherited from class org.infinispan.commons.marshall.AbstractMarshaller

getBufferSizePredictor, objectFromByteBuffer, objectFromInputStream, objectToBuffer, objectToByteBuffer, objectToByteBuffer

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.infinispan.commons.marshall.StreamingMarshaller

objectFromInputStream

Methods inherited from interface org.infinispan.commons.marshall.Marshaller

getBufferSizePredictor, objectFromByteBuffer, objectToBuffer, objectToByteBuffer, objectToByteBuffer

Constructor Detail

VersionAwareMarshaller

public VersionAwareMarshaller()

Method Detail

inject

public void inject(Cache cache,
          Configuration cfg,
          InvocationContextContainer icc,
          ExternalizerTable extTable,
          GlobalConfiguration globalCfg)

start

public void start()

Specified by:

start in interface StreamingMarshaller

stop

public void stop()

Description copied from interface: StreamingMarshaller

Stop the marshaller. Implementations of this method should clear up any cached data, or close any resources while marshalling/unmarshalling that have not been already closed.

Specified by:

stop in interface StreamingMarshaller

objectToBuffer

protected ByteBuffer objectToBuffer(Object obj,
                        int estimatedSize)
                             throws IOException,
                                    InterruptedException

Description copied from class: AbstractMarshaller

This is a convenience method for converting an object into a org.infinispan.io.ByteBuffer which takes an estimated size as parameter. A org.infinispan.io.ByteBuffer allows direct access to the byte array with minimal array copying

Specified by:

objectToBuffer in class AbstractMarshaller

Parameters:

obj - object to marshall

estimatedSize - an estimate of how large the resulting byte array may be

Throws:

IOException

InterruptedException

objectFromByteBuffer

public Object objectFromByteBuffer(byte[] bytes,
                          int offset,
                          int len)
                            throws IOException,
                                   ClassNotFoundException

Description copied from interface: Marshaller

Unmarshalls an object from a specific portion of a byte array.

Specified by:

objectFromByteBuffer in interface Marshaller

Parameters:

bytes - byte array containing the binary representation of an object. Must not be null.

offset - point in buffer to start reading

len - number of bytes to consider

Returns:

an object

Throws:

IOException - if unmarshalling cannot complete due to some I/O error

ClassNotFoundException - if the class of the object trying to unmarshall is unknown

startObjectOutput

public ObjectOutput startObjectOutput(OutputStream os,
                             boolean isReentrant,
                             int estimatedSize)
                               throws IOException

Description copied from interface: StreamingMarshaller

Create and open an ObjectOutput instance for the given output stream. This method should be used for opening data outputs when multiple objectToObjectStream() calls will be made before the stream is closed by calling finishObjectOutput().

This method also takes a boolean that represents whether this particular call to startObjectOutput() is reentrant or not. A call to startObjectOutput() should be marked reentrant whenever a 2nd or more calls to this method are made without having called finishObjectOutput() first.

To potentially speed up calling startObjectOutput multiple times in a non-reentrant way, i.e. startObjectOutput/finishObjectOutput...startObjectOutput/finishObjectOutput...etc, which is is the most common case, the StreamingMarshaller implementation could potentially use some mechanisms to speed up this startObjectOutput call.

On the other hand, when a call is reentrant, i.e. startObjectOutput/startObjectOutput(reentrant)...finishObjectOutput/finishObjectOutput, the StreamingMarshaller implementation might treat it differently. An example of reentrancy would be marshalling of MarshalledValue. When sending or storing a MarshalledValue, a call to startObjectOutput() would occur so that the stream is open and following, a 2nd call could occur so that MarshalledValue's raw byte array version is calculated and sent across. This enables storing as binary on the receiver side which is performance gain. The StreamingMarshaller implementation could decide that it needs a separate ObjectOutput or similar for the 2nd call since it's aim is only to get the raw byte array version and the close finish with it.

Specified by:

startObjectOutput in interface StreamingMarshaller

Parameters:

os - output stream

isReentrant - whether the call is reentrant or not.

estimatedSize - estimated size in bytes of the output. Only meant as a possible performance optimization.

Returns:

ObjectOutput to write to

Throws:

IOException

finishObjectOutput

public void finishObjectOutput(ObjectOutput oo)

Description copied from interface: StreamingMarshaller

Finish using the given ObjectOutput. After opening a ObjectOutput and calling objectToObjectStream() multiple times, use this method to flush the data and close if necessary

Specified by:

finishObjectOutput in interface StreamingMarshaller

Parameters:

oo - data output that finished using

objectToObjectStream

public void objectToObjectStream(Object obj,
                        ObjectOutput out)
                          throws IOException

Description copied from interface: StreamingMarshaller

Marshalls an object to a given ObjectOutput

Specified by:

objectToObjectStream in interface StreamingMarshaller

Parameters:

obj - object to marshall

out - stream to marshall to

Throws:

IOException

startObjectInput

public ObjectInput startObjectInput(InputStream is,
                           boolean isReentrant)
                             throws IOException

Description copied from interface: StreamingMarshaller

Create and open a new ObjectInput for the given input stream. This method should be used for opening data inputs when multiple objectFromObjectStream() calls will be made before the stream is closed.

This method also takes a boolean that represents whether this particular call to startObjectInput() is reentrant or not. A call to startObjectInput() should be marked reentrant whenever a 2nd or more calls to this method are made without having called finishObjectInput() first.

To potentially speed up calling startObjectInput multiple times in a non-reentrant way, i.e. startObjectInput/finishObjectInput...startObjectInput/finishObjectInput...etc, which is is the most common case, the StreamingMarshaller implementation could potentially use some mechanisms to speed up this startObjectInput call.

Specified by:

startObjectInput in interface StreamingMarshaller

Parameters:

is - input stream

isReentrant - whether the call is reentrant or not.

Returns:

ObjectInput to read from

Throws:

IOException

finishObjectInput

public void finishObjectInput(ObjectInput oi)

Description copied from interface: StreamingMarshaller

Finish using the given ObjectInput. After opening a ObjectInput and calling objectFromObjectStream() multiple times, use this method to flush the data and close if necessary

Specified by:

finishObjectInput in interface StreamingMarshaller

Parameters:

oi - data input that finished using

objectFromObjectStream

public Object objectFromObjectStream(ObjectInput in)
                              throws IOException,
                                     ClassNotFoundException,
                                     InterruptedException

Description copied from interface: StreamingMarshaller

Unmarshalls an object from an ObjectInput

Specified by:

objectFromObjectStream in interface StreamingMarshaller

Parameters:

in - stream to unmarshall from

Throws:

IOException - if unmarshalling cannot complete due to some I/O error

ClassNotFoundException - if the class of the object trying to unmarshall is unknown

InterruptedException - if the unmarshalling was interrupted. Clients should take this as a sign that the marshaller is no longer available, maybe due to shutdown, and so no more unmarshalling should be attempted.

isMarshallable

public boolean isMarshallable(Object o)
                       throws Exception

Description copied from interface: Marshaller

A method that checks whether the given object is marshallable as per the rules of this marshaller.

Specified by:

isMarshallable in interface Marshaller

Parameters:

o - object to verify whether it's marshallable or not

Returns:

true if the object is marshallable, otherwise false

Throws:

Exception - if while checking whether the object was serializable or not, an exception arose

getCacheName

public String getCacheName()