JDWP Command Packet Byte Merging for Reduced Overhead

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Solution Overview

Problem

Conventional JAVA Debug Wire Protocol (JDWP) command packets require unnecessary bytes for command set and command fields, leading to inefficient data transmission and parsing, as they often provide more unique IDs than needed for practical purposes.

Innovation Solution

Modifying the JDWP protocol to use one byte of the ID field as the command set value and another byte as the command value, reducing the number of bytes needed to be written and parsed, and allowing for the inclusion of additional values in the ID field, thereby reducing data transmission overhead.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If conventional JDWP protocol uses 4 bytes for ID field and separate command set and command fields, then sufficient unique IDs are provided, but data transmission overhead increases

Engineering Contradiction:

Improvedata transmission overheadVSAvoidunique ID capacity

Core Design Contradiction:

Quantity of substanceVSAdaptability or versatility

Solution Approach 1:

The patent merges the ID field with the command set and command fields by encoding command set and command values within the ID field bytes. Specifically, the first byte of the ID field contains the command set value and the second byte contains the command value, eliminating the need for separate command set and command fields in the packet structure.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The ID field is given multiple functions: it serves both as a unique identifier for command/reply packet pairs and as a container for command set and command values. This multi-functionality reduces the total number of bytes required in each packet while maintaining the ability to identify and execute specific debugging operations.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Ease of operation

If conventional JDWP protocol includes separate command set and command fields, then command identification is explicit, but parsing complexity increases

Engineering Contradiction:

Improveparsing efficiencyVSAvoidpacket structure

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The patent combines multiple packet identification elements (ID, command set, command) into a single integrated structure where the ID field bytes directly encode the command set and command values. This reduces the number of fields that need to be parsed and processed separately.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent extracts the command set and command values from their traditional separate field positions and repositions them within the ID field structure. This reorganization simplifies the overall packet parsing process by reducing the number of extraction operations needed.

Inventive Principle:

Principle #2Taking out (Extraction)

Data Source

PatentUS8572569B2Modified implementation of a debugger wire protocol and command packet

Publication Date: 2013.10.29 ORACLE INT CORP

AI summary

A client debugger application or a virtual machine includes a receiving module configured to receive a command packet of a debugging protocol from a computer. The command packet includes an identifier (ID) field. The client debugger application or the virtual machine also includes a parsing module configured to parse an ID from the ID field. One byte of the ID field doubles as a command set value and another byte of the ID field doubles as a command value. The client debugger application or the virtual machine further includes a debugging module configured to use the parsed ID, command set value and command value to perform at least one debugging operation.