Package org.infinispan.commons.marshall

Interface StreamingMarshaller

All Superinterfaces:

Marshaller

All Known Implementing Classes:

AbstractDelegatingMarshaller, AbstractJBossMarshaller, GenericJBossMarshaller, GlobalMarshaller, JBossMarshaller, MigrationMarshaller

@ThreadSafe
public interface StreamingMarshaller
extends Marshaller

A specialization of Marshaller that supports streams.

A single instance of any implementation is shared by multiple threads, so implementations need to be threadsafe, and preferably immutable.

Since:

4.0

Author:

Manik Surtani, Galder Zamarreño

See Also:

Marshaller

Method Summary

Modifier and Type	Method	Description
void	finishObjectInput(ObjectInput oi)	Finish using the given ObjectInput.
void	finishObjectOutput(ObjectOutput oo)	Finish using the given ObjectOutput.
Object	objectFromInputStream(InputStream is)	Unmarshall an object from an InputStream
Object	objectFromObjectStream(ObjectInput in)	Unmarshalls an object from an ObjectInput
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 interface org.infinispan.commons.marshall.Marshaller

getBufferSizePredictor, isMarshallable, mediaType, objectFromByteBuffer, objectFromByteBuffer, objectToBuffer, objectToByteBuffer, objectToByteBuffer

Method Detail

startObjectOutput

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

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.

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

void finishObjectOutput(ObjectOutput oo)

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

Parameters:

oo - data output that finished using

objectToObjectStream

void objectToObjectStream(Object obj,
                          ObjectOutput out)
                   throws IOException

Marshalls an object to a given ObjectOutput

Parameters:

obj - object to marshall

out - stream to marshall to

Throws:

IOException

startObjectInput

ObjectInput startObjectInput(InputStream is,
                             boolean isReentrant)
                      throws IOException

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.

Parameters:

is - input stream

isReentrant - whether the call is reentrant or not.

Returns:

ObjectInput to read from

Throws:

IOException

finishObjectInput

void finishObjectInput(ObjectInput oi)

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

Parameters:

oi - data input that finished using

objectFromObjectStream

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

Unmarshalls an object from an ObjectInput

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.

objectFromInputStream

Object objectFromInputStream(InputStream is)
                      throws IOException,
                             ClassNotFoundException

Unmarshall an object from an InputStream

Parameters:

is - stream to unmarshall from

Returns:

the unmarshalled object instance

Throws:

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

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

stop

void stop()

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.

start

void start()