The technical principle interpretation of OpenHFT/HUGECOLLECTIONS/Collections framework in the Java class library VA Class Libraries)

OpenHFT/HUGECOLLECTIONS/Collections Framework is a powerful and efficient set framework in the Java class library.This article will interpret the technical principles of the framework and provide examples of Java code when necessary. The design purpose of this framework is to provide high -performance and low -delay set operations when dealing with large amounts of data.Its technical principles mainly include two aspects: the optimization of memory layout and data access method. 1. Memory layout optimization: This framework is allocated by direct memory to avoid the creation of objects on the Java pile and the performance overhead brought by garbage recycling.Direct memory distribution can be read and write directly on the memory by using the Bytebuffer class. Example code 1: Direct memory allocation ByteBuffer buffer = ByteBuffer.allocateDirect(size); In addition, the framework also stores the data in the page cache of the operating system by memory mapping files, which improves the efficiency of data reading and writing. Example code 2: Memory mapping file MappedByteBuffer buffer = FileChannel.map(FileChannel.MapMode.READ_WRITE, position, size); 2. Data access method optimization: To reduce the number of copies of data in memory and increase access speed, the framework uses the technical principles of OFF-Heap and Zero-Copy. Off-Heap refers to storing data in the outside memory, which can be implemented through the DirectBytebuffer class.This method can reduce GC pressure and speed up reading and writing operations. Example code 3: OFF-Heap storage ByteBuffer buffer = ByteBuffer.allocateDirect(size); Zero-Copy means that during the data transmission process, the data does not need to copy the data from one buffer to another, but to share data directly between different buffers. Example code 4: Zero-Copy data transmission ByteBuffer srcBuffer = ByteBuffer.allocateDirect(size); ByteBuffer destBuffer = ByteBuffer.allocateDirect(size); // Zero copy transmission destBuffer.put(srcBuffer); By optimizing with memory layout and data access method, the framework can achieve efficient collection operations.Its design ideas and technical principles make it suitable for processing large -scale data, especially the scenes that need to read and write frequently. Summarize: OpenHFT/HUGECOLLECTIONS/Collections framework is a high -performance and low -delayed Java set framework.It improves the efficiency of data operation by optimization of memory layout and data access.The use of these technical principles makes the framework perform well in big data processing and is suitable for scenes that need to read and write frequently.