uka.karmi.dgc
Class HierarchicalDGC.Counter

java.lang.Object
  uka.karmi.dgc.HierarchicalDGC.Counter

Enclosing class:

HierarchicalDGC

final class HierarchicalDGC.Counter

extends java.lang.Object

Counts remote references and prevents the local server implementation form being garbage collected by keeping a local reference to it.

Author:

Bernhard Haumacher, Christian Nester

Field Summary

private int	cnt The number of references that left the VM and are not yet finalized.
private int	exportId Export point identifier.
private int	objectId Identifier of the remote object this counter counts references to.
private RemoteServerRef	serverRef Reference to the local server implementation.

Constructor Summary

HierarchicalDGC.Counter(int exportId, int objectId)

Method Summary

boolean	dec() Decrements the counter.
boolean	equals(java.lang.Object obj)
int	hashCode()
void	inc() Increments the counter.
void	init(RemoteServerRef serverRef) Inits this counter with a server reference and sets its count to one.
java.lang.String	toString()
java.lang.String	toStringMembers()

Methods inherited from class java.lang.Object

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

Field Detail

exportId

private int exportId

Export point identifier.

objectId

private int objectId

Identifier of the remote object this counter counts references to.

cnt

private int cnt

The number of references that left the VM and are not yet finalized.

serverRef

private RemoteServerRef serverRef

Reference to the local server implementation. This reference prevents the server from being garbage collected as long as remote references to it exist.

Constructor Detail

HierarchicalDGC.Counter

public HierarchicalDGC.Counter(int exportId,
                               int objectId)

Method Detail

init

public void init(RemoteServerRef serverRef)

Inits this counter with a server reference and sets its count to one.

inc

public void inc()

Increments the counter.

dec

public boolean dec()

Decrements the counter. If count has reached zero, the RemoteServerRef.unreferenced() method of the server implementation is called.

Returns:

whether the count has reached zero.

equals

public boolean equals(java.lang.Object obj)

hashCode

public int hashCode()

toStringMembers

public java.lang.String toStringMembers()

toString

public java.lang.String toString()