Thread-Local Character Array Pool for Java String Operations
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Solution Overview
Problem
Java virtual machines face inefficiencies in string operations due to the immutable nature of the String class and the memory and time overhead associated with creating new character arrays for manipulation, especially when using StringBuffer and StringBuilder classes.
Innovation Solution
Implementing a virtual machine environment that utilizes thread-local character arrays, allowing borrowing of character arrays for string operations, reducing the need for frequent array creation and copying, and enabling garbage collection to manage these arrays efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the String class is used for text storage and manipulation, then the immutability and safety of string operations are ensured, but the time and memory consumption increase due to creating new character arrays for each manipulation
Solution Approach 1:
The patent introduces a dynamic character array pool that can be allocated and deallocated based on runtime needs. Instead of creating new arrays for every string operation, the system dynamically borrows arrays from the pool when available and returns them when done, making the memory allocation process adaptive and efficient while maintaining thread safety through synchronization mechanisms
Solution Approach 2:
The patent pre-allocates a pool of character arrays at the beginning of thread execution or VM startup. These arrays are prepared in advance and stored in a pool structure, so when string manipulation is needed, the system can immediately borrow from the pre-prepared pool rather than allocating new memory each time, significantly reducing allocation overhead
2Reliability
If the String class is used for text storage and manipulation, then the immutability and safety of string operations are ensured, but the memory consumption increases due to creating new character arrays for each manipulation
Solution Approach 1:
The patent implements a character array pool where arrays are discarded from individual string operations but recovered and reused in the pool. When a string operation completes, its character array is returned to the pool instead of being garbage collected, allowing the same array to be reused by subsequent operations, thereby reducing overall memory consumption while maintaining the safety guarantees of immutable Strings
Solution Approach 2:
The patent creates a universal character array pool that serves multiple string operations across different parts of the program. A single pool structure provides arrays to multiple StringBuilder instances and string manipulation operations, making the memory resource universally shared rather than dedicated to individual operations, thus reducing total memory usage
3Adaptability or versatility
If StringBuffer or StringBuilder classes are used for mutable string operations, then the capability to add, remove, or change string state is improved, but the overhead of array creation and copying remains significant
Solution Approach 1:
The patent enables StringBuilder and StringBuffer to self-service from the character array pool. When these classes need to expand or manipulate their internal arrays, they automatically check the pool for available arrays, borrow them if available, and return them when done. This self-service mechanism eliminates the need for manual array management and reduces creation/copying overhead without requiring changes to the external API
4Ease of manufacture
If traditional character array allocation is used for each string operation, then the simplicity of memory management is maintained, but the productivity and performance of string operations decrease
Solution Approach 1:
The patent introduces a character array pool as an intermediary layer between the Java runtime and the actual memory allocation. This pool mediates all character array requests from String, StringBuilder, and StringBuffer operations, providing a simplified interface for high-performance operations while handling the complexity of allocation, deallocation, and reuse in the background, thus improving productivity without complicating the programmer's task
Data Source
AI summary
In one embodiment the present invention includes a virtual machine environment that performs string operations using borrowed character arrays. A method includes creating a character array area that is related to a thread. The method further includes detecting a string operation which qualifies for using a character array from the thread's character array area. The method further includes borrowing a character array of a character array slot of the character array area. The method further includes performing the string operation using the character array having been borrowed. The method further includes returning the character array to the character array slot when the string operation has been performed. In this manner, the time and memory consumed by string operations may be reduced.