Class RemoteFileDescriptorBase<T>

java.lang.Object

org.newsclub.net.unix.rmi.RemoteFileDescriptorBase<T>

Type Parameters:

T - The resource type.

All Implemented Interfaces:

Closeable, Externalizable, Serializable, AutoCloseable, FileDescriptorAccess

Direct Known Subclasses:

RemoteFileDescriptor, RemoteFileInput, RemoteFileOutput

public abstract class RemoteFileDescriptorBase<T>
extends Object
implements Externalizable, Closeable, FileDescriptorAccess

A wrapper that allows a FileDescriptor be sent via RMI over AF_UNIX sockets.

Author:

Christian Kohlschütter

See Also:

• RemoteFileInput
• RemoteFileOutput
• Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
protected final AtomicReference<T>	resource	An optional, closeable resource that is related to this instance.

Constructor Summary

Constructors

Constructor	Description
RemoteFileDescriptorBase()	Creates an uninitialized instance; used for externalization.

Method Summary

Modifier and Type	Method	Description
void	close()
final FileDescriptor	getFileDescriptor()	Returns the file descriptor.
protected final int	getMagicValue()	Returns the "magic value" for this type of file descriptor.
final void	readExternal(ObjectInput objIn)
final void	writeExternal(ObjectOutput objOut)

Methods inherited from class Object

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

Field Details

resource

protected final transient AtomicReference<T> resource

An optional, closeable resource that is related to this instance. If the reference is non-null, this will be closed upon close(). For unidirectional implementations, this could be the corresponding input/output stream. For bidirectional implementations (e.g., a Socket, Pipe, etc.), this should close both directions.

Constructor Details

RemoteFileDescriptorBase

public RemoteFileDescriptorBase()

Creates an uninitialized instance; used for externalization.

See Also:

• readExternal(ObjectInput)

Method Details

writeExternal

public final void writeExternal(ObjectOutput objOut)
                         throws IOException

Specified by:

writeExternal in interface Externalizable

Throws:

IOException

readExternal

public final void readExternal(ObjectInput objIn)
                        throws IOException,
ClassNotFoundException

Specified by:

readExternal in interface Externalizable

Throws:

IOException

ClassNotFoundException

getFileDescriptor

public final FileDescriptor getFileDescriptor()

Returns the file descriptor. This is either the original one that was specified in the constructor or a copy that was sent via RMI over an AF_UNIX connection as part of an ancillary message.

Specified by:

getFileDescriptor in interface FileDescriptorAccess

Returns:

The file descriptor.

getMagicValue

protected final int getMagicValue()

Returns the "magic value" for this type of file descriptor. The magic value consists of an indicator ("this is a file descriptor") as well as its capabilities (read/write). It is used to prevent, for example, converting an output stream to an input stream.

Returns:

The magic value.

close

public void close()
           throws IOException

Specified by:

close in interface AutoCloseable

Specified by:

close in interface Closeable

Throws:

IOException