Class AnnotatedObjectInputStream

java.lang.Object

java.io.InputStream

java.io.ObjectInputStream

com.gigaspaces.internal.io.AnnotatedObjectInputStream

All Implemented Interfaces:

Closeable, DataInput, ObjectInput, ObjectStreamConstants, AutoCloseable

Direct Known Subclasses:

MarshalInputStream

public class AnnotatedObjectInputStream
extends ObjectInputStream

An extension of ObjectInputStream that implements the dynamic class loading semantics of RMI argument and result unmarshalling (using RMIClassLoader). A AnnotatedObjectInputStream is intended to read data written by a corresponding AnnotatedObjectOutputStream.

AnnotatedObjectInputStream implements the input side of the dynamic class loading semantics by overriding resolveClass and resolveProxyClass to resolve class descriptors in the stream using

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ClassLoading.loadClass

and

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ClassLoading.loadProxyClass

(which, in turn, use RMIClassLoader.loadClass and RMIClassLoader.loadProxyClass), optionally with CodeBase annotation strings written by a AnnotatedObjectOutputStream.

AnnotatedObjectInputStream reads class annotations from its own stream; a subclass can override the readAnnotation method to read the class annotations from a different location.

A AnnotatedObjectInputStream is not guaranteed to be safe for concurrent use by multiple threads.

Since:

5.1

Author:

Igor Goldenberg, anna

Nested Class Summary

Nested classes/interfaces inherited from class ObjectInputStream

ObjectInputStream.GetField

Field Summary

Fields inherited from interface ObjectStreamConstants

baseWireHandle, PROTOCOL_VERSION_1, PROTOCOL_VERSION_2, SC_BLOCK_DATA, SC_ENUM, SC_EXTERNALIZABLE, SC_SERIALIZABLE, SC_WRITE_METHOD, SERIAL_FILTER_PERMISSION, STREAM_MAGIC, STREAM_VERSION, SUBCLASS_IMPLEMENTATION_PERMISSION, SUBSTITUTION_PERMISSION, TC_ARRAY, TC_BASE, TC_BLOCKDATA, TC_BLOCKDATALONG, TC_CLASS, TC_CLASSDESC, TC_ENDBLOCKDATA, TC_ENUM, TC_EXCEPTION, TC_LONGSTRING, TC_MAX, TC_NULL, TC_OBJECT, TC_PROXYCLASSDESC, TC_REFERENCE, TC_RESET, TC_STRING

Constructor Summary

Constructors

Constructor	Description
AnnotatedObjectInputStream(InputStream in)	Creates a new AnnotatedObjectInputStream that reads marshalled data from the specified underlying InputStream.

Method Summary

Modifier and Type	Method	Description
protected String	readAnnotation(ObjectStreamClass desc)	Reads and returns a class annotation string value (possibly null) that was written by a corresponding AnnotatedObjectOutputStream implementation.
protected Class	resolveClass(ObjectStreamClass classDesc)
protected Class	resolveClass(ObjectStreamClass classDesc, boolean readAnnotation, String codebase)	Resolves the appropriate Class object for the stream class descriptor classDesc.

Methods inherited from class ObjectInputStream

available, close, defaultReadObject, enableResolveObject, getObjectInputFilter, read, read, readBoolean, readByte, readChar, readClassDescriptor, readDouble, readFields, readFloat, readFully, readFully, readInt, readLine, readLong, readObject, readObjectOverride, readShort, readStreamHeader, readUnshared, readUnsignedByte, readUnsignedShort, readUTF, registerValidation, resolveObject, resolveProxyClass, setObjectInputFilter, skipBytes

Methods inherited from class InputStream

mark, markSupported, nullInputStream, read, readAllBytes, readNBytes, readNBytes, reset, skip, skipNBytes, transferTo

Methods inherited from class Object

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

Methods inherited from interface ObjectInput

read, skip

Constructor Details

AnnotatedObjectInputStream

public AnnotatedObjectInputStream(InputStream in)
                           throws IOException

Creates a new AnnotatedObjectInputStream that reads marshalled data from the specified underlying InputStream.

This constructor passes in to the superclass constructor that has an InputStream parameter.

defaultLoader will be passed as the defaultLoader argument to

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ClassLoading.loadClass

and

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ClassLoading.loadProxyClass

whenever those methods are invoked by resolveClass and resolveProxyClass.

If verifyCodebaseIntegrity is true, then the created stream will verify that all codebase annotation URLs that are used to load classes resolved by the stream provide content integrity, and whenever

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Security.verifyCodebaseIntegrity

is invoked to enforce that verification, verifierLoader will be passed as the loader argument. See

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ClassLoading.loadClass

and

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ClassLoading.loadProxyClass

for details of how codebase integrity verification is performed.

context will be used as the return value of the created stream's

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getObjectStreamContext

method.

Parameters:

in - the input stream to read marshalled data from

defaultLoader - the class loader value (possibly null) to pass as the defaultLoader argument to ClassLoading methods

context - the collection of context information objects to be returned by this stream's

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getObjectStreamContext

method

Throws:

IOException - if the superclass's constructor throws an IOException

SecurityException - if the superclass's constructor throws a SecurityException

NullPointerException - if in or context is null

Method Details

resolveClass

protected Class resolveClass(ObjectStreamClass classDesc,
 boolean readAnnotation,
 String codebase)
                      throws IOException,
ClassNotFoundException

Resolves the appropriate Class object for the stream class descriptor classDesc.

AnnotatedObjectInputStream implements this method as follows:

Invokes this stream's readAnnotation method to read the annotation string value (possibly null) for the class descriptor. If readAnnotation throws an exception, then this method throws that exception. Otherwise, a codebase value is chosen as follows: if the

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useCodebaseAnnotations

method has been invoked on this stream, then the codebase value chosen is the value that was returned by readAnnotation; otherwise, the codebase value chosen is null.

This method then invokes

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ClassLoading.loadClass

with the chosen codebase value as the first argument, the name of the class described by classDesc as the second argument, and the defaultLoader, verifyCodebaseIntegrity, and verifierLoader values that were passed to this stream's constructor as the third, fourth, and fifth arguments. If ClassLoading.loadClass throws a ClassNotFoundException and the name of the class described by classDesc equals the Java(TM) programming language keyword for a primitive type or void, then this method returns the Class corresponding to that primitive type or void (Integer.TYPE for int, Void.TYPE for void, and so forth). Otherwise, if ClassLoading.loadClass throws an exception, this method throws that exception, and if it returns normally, this method returns the Class returned by ClassLoading.loadClass.

Parameters:

classDesc - the stream class descriptor to resolve

Returns:

the resolved class

Throws:

IOException - if readAnnotation throws an IOException, or if ClassLoading.loadClass throws a MalformedURLException

ClassNotFoundException - if readAnnotation or ClassLoading.loadClass throws a ClassNotFoundException

NullPointerException - if classDesc is null

resolveClass

protected Class resolveClass(ObjectStreamClass classDesc)
                      throws IOException,
ClassNotFoundException

Overrides:

resolveClass in class ObjectInputStream

Throws:

IOException

ClassNotFoundException

readAnnotation

protected String readAnnotation(ObjectStreamClass desc)
                         throws IOException,
ClassNotFoundException

Reads and returns a class annotation string value (possibly null) that was written by a corresponding AnnotatedObjectOutputStream implementation.

AnnotatedObjectInputStream implements this method to just read the annotation value from this stream using readUnshared, and if readUnshared returns a non-null value that is not a String, an InvalidObjectException is thrown.

A subclass can override this method to read the annotation from a different location.

Returns:

the class annotation string value read (possibly null)

Throws:

IOException - if an I/O exception occurs reading the annotation

ClassNotFoundException - if a ClassNotFoundException occurs reading the annotation