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java.lang.Objectorg.objectweb.perseus.concurrency.pessimistic.Lock
org.objectweb.perseus.concurrency.pessimistic.RWPri2RLock
A lock associated to an oid (see the "locks" map within the pessimistic concurrency manager). Provides "one writer/multiple readers" concurrency policy with priority to readers (there is a risk for starvation wrt writers).
Field Summary | |
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protected java.util.Set |
readers
The contexts that have a read lock for the oid to which this object is associated. |
protected java.lang.Object |
writer
The contexts that have a lock for the oid to which this object is associated. |
Fields inherited from class org.objectweb.perseus.concurrency.pessimistic.Lock |
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dg, hints, logger, oid, reservations |
Constructor Summary | |
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RWPri2RLock()
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RWPri2RLock(java.lang.Object hints,
DependencyGraph dg)
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Method Summary | |
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boolean |
close(java.lang.Object ctxt)
Removes the given context from the reader and writer lists of this lock. |
byte |
getMax()
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void |
readIntention(java.lang.Object ctxt)
Acquires this lock in read mode for the given context. |
void |
writeIntention(java.lang.Object ctxt)
Acquires this lock in write mode for the given context. |
Methods inherited from class org.objectweb.perseus.concurrency.pessimistic.Lock |
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reserve |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
protected java.lang.Object writer
protected java.util.Set readers
Constructor Detail |
public RWPri2RLock()
public RWPri2RLock(java.lang.Object hints, DependencyGraph dg)
Method Detail |
public void readIntention(java.lang.Object ctxt) throws ConcurrencyException
readIntention
in class Lock
ctxt
- a context.
ConcurrencyException
public void writeIntention(java.lang.Object ctxt) throws ConcurrencyException
writeIntention
in class Lock
ctxt
- a context.
ConcurrencyException
public boolean close(java.lang.Object ctxt)
close
in class Lock
ctxt
- a context
public byte getMax()
getMax
in class Lock
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