org.objectweb.perseus.concurrency.pessimistic
Class Lock
java.lang.Object
org.objectweb.perseus.concurrency.pessimistic.Lock
- Direct Known Subclasses:
- MutexLock, RWFifoLock, RWPri2RLock
- public abstract class Lock
- extends java.lang.Object
A lock associated to an oid (see the "locks" map within the pessimistic
concurrency manager).
- Author:
- E. Bruneton, P. Dechamboux
Constructor Summary |
Lock()
|
Lock(java.lang.Object hints,
DependencyGraph dg)
|
Method Summary |
abstract boolean |
close(java.lang.Object ctxt)
Removes the given context from the reader and writer lists of this
lock. |
abstract byte |
getMax()
|
abstract void |
readIntention(java.lang.Object ctxt)
Acquires this lock in read mode for the given context. |
void |
reserve()
|
abstract void |
writeIntention(java.lang.Object ctxt)
Acquires this lock in write mode for the given context. |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
reservations
protected int reservations
hints
public java.lang.Object hints
dg
public DependencyGraph dg
logger
public Logger logger
oid
public java.lang.Object oid
Lock
public Lock()
Lock
public Lock(java.lang.Object hints,
DependencyGraph dg)
reserve
public void reserve()
readIntention
public abstract void readIntention(java.lang.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.
- Parameters:
ctxt
- a context.
- Throws:
ConcurrencyException
writeIntention
public abstract void writeIntention(java.lang.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.
- Parameters:
ctxt
- a context.
- Throws:
ConcurrencyException
close
public abstract boolean close(java.lang.Object ctxt)
- Removes the given context from the reader and writer lists of this
lock.
- Parameters:
ctxt
- a context
- Returns:
- 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 abstract byte getMax()
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