Interface Synchronizer
- All Known Implementing Classes:
NoOpSynchronizer,ReadWriteSynchronizer
An interface controlling synchronization of configuration instances.
Each Configuration object derived from AbstractConfiguration has an associated Synchronizer object. Before an operation on the configuration is
performed (for example a property read or an update), the Synchronizer is invoked. Depending on the concrete
implementation of the Synchronizer 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 different
Synchronizer 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
Modifier and TypeMethodDescriptionvoidNotifies thisSynchronizerthat the current thread is going to start a read operation on the managed configuration.voidNotifies thisSynchronizerthat the current thread is going to start a write operation on the managed configuration.voidendRead()Notifies thisSynchronizerthat the current thread has finished its read operation.voidendWrite()Notifies thisSynchronizerthat the current thread has finished its write operation.
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Method Details
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beginRead
void beginRead()Notifies thisSynchronizerthat 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. -
beginWrite
void beginWrite()Notifies thisSynchronizerthat 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, -
endRead
void endRead()Notifies thisSynchronizerthat the current thread has finished its read operation. This may cause other waiting threads to be granted access to the managed configuration. -
endWrite
void endWrite()Notifies thisSynchronizerthat 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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