org.objectweb.perseus.concurrency.pessimistic
Class Lock
java.lang.Object
org.objectweb.perseus.concurrency.pessimistic.Lock
public abstract class Lock
extends java.lang.Object
A lock associated to an oid (see the "locks" map within the pessimistic
concurrency manager).
- E. Bruneton, P. Dechamboux
Lock()
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Lock(Object hints, DependencyGraph dg)
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boolean | close(Object ctxt) - Removes the given context from the reader and writer lists of this
lock.
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byte | getMax()
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void | readIntention(Object ctxt) - Acquires this lock in read mode for the given context.
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void | reserve()
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void | writeIntention(Object ctxt) - Acquires this lock in write mode for the given context.
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dg
public DependencyGraph dg
logger
public Logger logger
reservations
protected int reservations
Lock
public Lock(Object hints,
DependencyGraph dg)
close
public boolean close(Object ctxt)
Removes the given context from the reader and writer lists of this
lock.
ctxt
- a context
- true if the reader and writer list are empty, after the
context has been removed from these lists. In such a case, this
object can be removed from the 'locks' map.
getMax
public byte getMax()
readIntention
public void readIntention(Object ctxt)
throws ConcurrencyException
Acquires this lock in read mode for the given context. This method
blocks until the lock can be acquired in read mode by this context.
ctxt
- a context.
reserve
public void reserve()
writeIntention
public void writeIntention(Object ctxt)
throws ConcurrencyException
Acquires this lock in write mode for the given context. This method
blocks until the lock can be acquired in write mode by this context.
ctxt
- a context.
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