Interface Synchronizer
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- All Known Implementing Classes:
NoOpSynchronizer
,ReadWriteSynchronizer
public interface Synchronizer
An interface controlling synchronization of configuration instances.
Each
Configuration
object derived fromAbstractConfiguration
has an associatedSynchronizer
object. Before an operation on the configuration is performed (e.g. a property read or an update), theSynchronizer
is invoked. Depending on the concrete implementation of theSynchronizer
used, the configuration can be made thread-safe.Whether a configuration has to be thread-safe or not is a matter of a concrete use case. For instance, an application that just reads some configuration settings on startup does need a thread-safe configuration implementation. A configuration in contrast which is shared between multiple components and updated concurrently should better be thread-safe. In order to satisfy both kinds of use cases, the support for thread-safety has been extracted out of the configuration implementation and refactored into this
Synchronizer
interface. By assigning differentSynchronizer
implementations to a configuration instance, the instance's support for concurrent access can be adapted to the concrete use case.The methods defined by this interface are similar to a read-write lock. The
Synchronizer
is notified when read or write operations start and end. A concrete implementation can then apply a specific policy to decide when threads need to block or when access to the configuration for the desired operation is granted.- Since:
- 2.0
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Method Summary
All Methods Instance Methods Abstract Methods Modifier and Type Method Description void
beginRead()
Notifies thisSynchronizer
that the current thread is going to start a read operation on the managed configuration.void
beginWrite()
Notifies thisSynchronizer
that the current thread is going to start a write operation on the managed configuration.void
endRead()
Notifies thisSynchronizer
that the current thread has finished its read operation.void
endWrite()
Notifies thisSynchronizer
that the current thread has finished its write operation.
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Method Detail
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beginRead
void beginRead()
Notifies thisSynchronizer
that the current thread is going to start a read operation on the managed configuration. This call can block if a concrete implementation decides that the thread has to wait until a specific condition is fulfilled.
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endRead
void endRead()
Notifies thisSynchronizer
that the current thread has finished its read operation. This may cause other waiting threads to be granted access to the managed configuration.
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beginWrite
void beginWrite()
Notifies thisSynchronizer
that the current thread is going to start a write operation on the managed configuration. This call may block. For instance, a concrete implementation may suspend the thread until all read operations currently active are finished,
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endWrite
void endWrite()
Notifies thisSynchronizer
that the current thread has finished its write operation. This may cause other waiting threads to be granted access to the managed configuration.
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