Package org.apache.maven.impl.model

Class DefaultModelObjectPool

java.lang.Object

org.apache.maven.impl.model.DefaultModelObjectPool

All Implemented Interfaces:

ModelObjectProcessor

public class DefaultModelObjectPool
extends Object
implements ModelObjectProcessor

Default implementation of ModelObjectProcessor that provides memory optimization through object pooling and interning.

This implementation can pool any model object type based on configuration. By default, it pools Dependency objects, which are frequently duplicated in large Maven projects. Other model objects are passed through unchanged unless explicitly configured for pooling.

The pool uses configurable reference types and provides thread-safe access through ConcurrentHashMap-based caches.

Since:

4.0.0

Constructor Summary

Constructors

Constructor	Description
DefaultModelObjectPool()

Method Summary

Modifier and Type	Method	Description
static String	getAllStatistics()	Get statistics for all pooled object types.
static String	getStatistics(Class<?> objectType)	Get statistics for a specific object type.
<T> T	process(T object)	Process a model object, potentially returning a pooled or optimized version.

Methods inherited from class java.lang.Object

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

Constructor Details

DefaultModelObjectPool

public DefaultModelObjectPool()

Method Details

process

public <T> T process(T object)

Description copied from interface: ModelObjectProcessor

Process a model object, potentially returning a pooled or optimized version.

This method is called during model building for various model objects. Implementations can:

• Return the same object if no processing is desired
• Return a pooled equivalent object to reduce memory usage
• Return a modified or optimized version of the object

The implementation must ensure that the returned object is functionally equivalent to the input object from the perspective of the Maven model.

Specified by:

process in interface ModelObjectProcessor

Type Parameters:

T - the type of the model object

Parameters:

object - the model object to process

Returns:

the processed object (may be the same instance, a pooled instance, or a modified instance)

getStatistics

public static String getStatistics(Class<?> objectType)

Get statistics for a specific object type. Useful for monitoring and debugging.

getAllStatistics

public static String getAllStatistics()

Get statistics for all pooled object types.