How to Implement a Thread-Safe Object Pool in C# with Customizable Loading and Access Strategies?

C# Object Pooling Pattern Implementation

Implementing a thread-safe object pool strategy for a shared limited resource is a multifaceted task. This article provides a comprehensive approach that allows for flexibility in terms of resource loading, access patterns, and other parameters.

Resource Loading Mechanism

For the resource loading mechanism, the provided implementation utilizes delegates, allowing for easy customization of how resources are constructed. A generic type with a new() constraint can also be used for this purpose.

Access Strategy

Three different access strategies are implemented:

• FIFO (First-In, First-Out): A simple queue-based approach where resources are acquired in the order they were created.
• LIFO (Last-In, First-Out): A stack-based approach where resources are acquired in the reverse order they were created.
• Circular: A circular buffer-based approach where resources are acquired in an approximate round-robin fashion.

Loading Strategies

Three loading strategies are provided:

• Eager: All resources are preloaded at the time of pool creation.
• Lazy: Resources are created only when they are requested.
• LazyExpanding: Resources are created only when the pool is not full and when they are requested.

Pool Implementation

The core Pool class is responsible for managing access to and release of objects from the pool. It employs thread synchronization primitives to ensure thread safety and uses a semaphore to control the number of concurrent acquisitions.

Pooled Object Proxy

To make working with pooled objects more convenient, a PooledFoo class is implemented as a proxy around IFoo objects. This proxy allows for transparent release of objects back to the pool when they are disposed and handles cleanup of the underlying resource when the pool has been disposed.

Usage

The provided code sample includes a test program that demonstrates how to use the object pooling implementation with different loading and access modes, as well as under multithreaded conditions to verify its thread safety.

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