nonapi.io.github.classgraph.recycler

Class Recycler<T,E extends java.lang.Exception>

java.lang.Object

nonapi.io.github.classgraph.recycler.Recycler<T,E>

Type Parameters:

T - The type to recycle.

E - An exception that can be thrown while acquiring an instance of the type to recycle, or RuntimeException if none.

All Implemented Interfaces:

java.lang.AutoCloseable

public abstract class Recycler<T,E extends java.lang.Exception>
extends java.lang.Object
implements java.lang.AutoCloseable

Recycler for instances of type T, where instantiating this type may throw checked exception E.

Constructor Summary

Constructors

Constructor and Description
Recycler()

Method Summary

Modifier and Type	Method and Description
T	acquire() Acquire on object instance of type T, either by reusing a previously recycled instance if possible, or if there are no currently-unused instances, by allocating a new instance.
RecycleOnClose<T,E>	acquireRecycleOnClose() Acquire a Recyclable wrapper around an object instance, which can be used to recycle object instances at the end of a try-with-resources block.
void	close() Free all unused instances.
void	forceClose() Force-close this Recycler, by forcibly moving any instances that have been acquired but not yet recycled into the unused instances list, then calling close() to close any AutoCloseable instances and discard all instances.
abstract T	newInstance() Create a new instance.
void	recycle(T instance) Recycle an object for reuse by a subsequent call to acquire().

Methods inherited from class java.lang.Object

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

Constructor Detail

Recycler

public Recycler()

Method Detail

newInstance

public abstract T newInstance()
                       throws E extends java.lang.Exception

Create a new instance. This should either return a non-null instance of type T, or throw an exception of type E.

Returns:

The new instance.

Throws:

E - If an exception of type E was thrown during instantiation.

E extends java.lang.Exception

acquire

public T acquire()
          throws E extends java.lang.Exception

Acquire on object instance of type T, either by reusing a previously recycled instance if possible, or if there are no currently-unused instances, by allocating a new instance.

Returns:

Either a new or a recycled object instance.

Throws:

E - if newInstance() threw an exception of type E.

java.lang.NullPointerException - if newInstance() returned null.

E extends java.lang.Exception

acquireRecycleOnClose

public RecycleOnClose<T,E> acquireRecycleOnClose()
                                          throws E extends java.lang.Exception

Acquire a Recyclable wrapper around an object instance, which can be used to recycle object instances at the end of a try-with-resources block.

Returns:

Either a new or a recycled object instance.

Throws:

E - If anything goes wrong when trying to allocate a new object instance.

E extends java.lang.Exception

recycle

public final void recycle(T instance)

Recycle an object for reuse by a subsequent call to acquire(). If the object is an instance of Resettable, then Resettable.reset() will be called on the instance before recycling it.

Parameters:

instance - the instance to recycle.

Throws:

java.lang.IllegalArgumentException - if the object instance was not originally obtained from this Recycler.

close

public void close()

Free all unused instances. Calls AutoCloseable.close() on any unused instances that implement AutoCloseable.

The Recycler may continue to be used to acquire new instances after calling this close method, and then this close method may be called again in future, i.e. the effect of calling this method is to simply clear out the recycler of unused instances, closing any AutoCloseable instances.

Specified by:

close in interface java.lang.AutoCloseable

forceClose

public void forceClose()

Force-close this Recycler, by forcibly moving any instances that have been acquired but not yet recycled into the unused instances list, then calling close() to close any AutoCloseable instances and discard all instances.