org.objectweb.perseus.concurrency.pessimistic
Class MutexLock
public final class MutexLock
A lock associated to an oid (see the "locks" map within the pessimistic
concurrency manager).
Provides a mutex concurrency policy.
- E. Bruneton, P. Dechamboux
protected Object | writer - The contexts that have a lock for the oid to which this object is
associated.
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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 | writeIntention(Object ctxt) - Acquires this lock in write mode for the given context.
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writer
protected Object writer
The contexts that have a lock for the oid to which this object is
associated.
MutexLock
public MutexLock()
MutexLock
public MutexLock(Object hints,
DependencyGraph dg)
close
public boolean close(Object ctxt)
Removes the given context from the reader and writer lists of this
lock.
- close in interface 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()
- getMax in interface Lock
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.
- readIntention in interface Lock
ctxt
- a context.
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.
- writeIntention in interface Lock
ctxt
- a context.
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