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## Package org.modeshape.graph.connector.path.cache

The `PathRepositoryCache` class and its supporting classes provide a standard caching mechanism for path-based repositories.

See:
Description

Interface Summary
CacheStatistics | This interface provides access to statistics for an individual workspace cache.
PathCachePolicy | The provides a method for selectively allowing or disallowing nodes to be cached based on their size, volatility, or any other factor that can be determined for the node.
WorkspaceCache | The basic contract for a workspace-level cache of paths to the nodes stored at that path.

Class Summary
DefaultCacheStatistics | Default, thread-safe implementation of `CacheStatistics` that uses `AtomicLongs` as counters for the statistics.
InMemoryWorkspaceCache | Implementation of `WorkspaceCache` that stores all nodes in-memory.
InMemoryWorkspaceCache.InMemoryCachePolicy | Trivial path cache policy implementation that caches all nodes in an in-memory cache.
NoCachePolicy | Trivial path cache policy implementation that performs no caching at all
PathRepositoryCache | The repository-source level cache of workspace names to `workspace caches`.

## Package org.modeshape.graph.connector.path.cache Description

The `PathRepositoryCache` class and its supporting classes provide a standard caching mechanism for path-based repositories. Users of any path repository based on `AbstractPathRepositorySource` can call `AbstractPathRepositorySource.setCachePolicy(PathCachePolicy)` to configure the caching for that repository. This method can be invoked at run-time to modify the cache properties of an in-use repository.

Each `AbstractPathRepositorySource` has a local instance of `PathRepositoryCache` that reads the `PathCachePolicy` for the source and uses it to create instances of `WorkspaceCache` for each workspace in the repository. When a workspace cache instance is requested for the first time from the `PathRepositoryCache.getCache(String)` method, an instance of the class is created using the no-argument constructor for the class and `WorkspaceCache.initialize(PathCachePolicy, String)` is called with the current cache policy.

When `the cache policy is changed` on the source, the existing `PathRepositoryCache` is `closed` and a new path repository cache is created.

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