Package org.aspectj.org.eclipse.jdt.internal.core.search.indexing

Class ReadWriteMonitor

java.lang.Object

org.aspectj.org.eclipse.jdt.internal.core.search.indexing.ReadWriteMonitor

public class ReadWriteMonitor
extends Object

Monitor ensuring no more than one writer working concurrently. Multiple readers are allowed to perform simultaneously.

Constructor Summary

Constructors

Constructor	Description
ReadWriteMonitor()

Method Summary

Modifier and Type	Method	Description
void	enterRead()	Concurrent reading is allowed Blocking only when already writing.
void	enterWrite()	Only one writer at a time is allowed to perform Blocking only when already writing or reading.
void	exitRead()	Only notify waiting writer(s) if last reader
boolean	exitReadEnterWrite()	Atomic exitRead/enterWrite: Allows to keep monitor in between exit read and next enter write.
void	exitWrite()	When writing is over, all readers and possible writers are granted permission to restart concurrently
void	exitWriteEnterRead()	Atomic exitWrite/enterRead: Allows to keep monitor in between exit write and next enter read.
String	toString()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Details

ReadWriteMonitor

public ReadWriteMonitor()

Method Details

enterRead

public void enterRead()

Concurrent reading is allowed Blocking only when already writing.

enterWrite

public void enterWrite()

Only one writer at a time is allowed to perform Blocking only when already writing or reading.

exitRead

public void exitRead()

Only notify waiting writer(s) if last reader

exitWrite

public void exitWrite()

When writing is over, all readers and possible writers are granted permission to restart concurrently

exitReadEnterWrite

public boolean exitReadEnterWrite()

Atomic exitRead/enterWrite: Allows to keep monitor in between exit read and next enter write. Use when writing changes is optional, otherwise call the individual methods. Returns false if multiple readers are accessing the index.

exitWriteEnterRead

public void exitWriteEnterRead()

Atomic exitWrite/enterRead: Allows to keep monitor in between exit write and next enter read. When writing is over, all readers are granted permissing to restart concurrently. This is the same as:

 synchronized(monitor) {
   monitor.exitWrite();
   monitor.enterRead();
 }
 

toString

public String toString()

Overrides:

toString in class Object