Object pooling API.
org.apache.tomcat.dbcp.pool2 package defines a simple
interface for a pool of object instances, and a handful of base
classes that may be useful when creating pool implementations.
pool package itself doesn't define a specific object
pooling implementation, but rather a contract that implementations may
support in order to be fully interchangeable.
pool package separates the way in which instances are
pooled from the way in which they are created, resulting in a pair of
- defines a simple object pooling interface, with methods for borrowing instances from and returning them to the pool.
- defines lifecycle methods for object instances contained within a pool. By associating a factory with a pool, the pool can create new object instances as needed.
pool package also provides a keyed pool interface,
which pools instances of multiple types, accessed according to an
arbitrary key. See
Interface Summary Interface Description KeyedObjectPool<K,V>A "keyed" pooling interface. KeyedPooledObjectFactory<K,V>An interface defining life-cycle methods for instances to be served by a
ObjectPool<T>A pooling simple interface. PooledObject<T>Defines the wrapper that is used to track the additional information, such as state, for the pooled objects. PooledObjectFactory<T>An interface defining life-cycle methods for instances to be served by an
SwallowedExceptionListenerPools that unavoidably swallow exceptions may be configured with an instance of this listener so the user may receive notification of when this happens. TrackedUseThis interface allows pooled objects to make information available about when and how they were used available to the object pool. UsageTracking<T>This interface may be implemented by an object pool to enable clients (primarily those clients that wrap pools to provide pools with extended features) to provide additional information to the pool relating to object using allowing more informed decisions and reporting to be made regarding abandoned objects.
Class Summary Class Description BaseKeyedPooledObjectFactory<K,V>A base implementation of
BaseObjectA base class for common functionality. BaseObjectPool<T>A simple base implementation of
BasePooledObjectFactory<T>A base implementation of
PoolUtilsThis class consists exclusively of static methods that operate on or return ObjectPool or KeyedObjectPool related interfaces.
Enum Summary Enum Description DestroyModeDestroy context provided to object factories via destroyObject methods. PooledObjectStateProvides the possible states that a
PooledObjectmay be in.