greenlet VS Eclipse RAP

• Lightweight
  Greenlets are more lightweight than native threads as they do not require their own OS-level thread. This leads to lower memory consumption and reduced overhead.
• Simple API
  Greenlet provides a simple and intuitive API for developers, making it easier to write concurrent code without needing to manage full coroutine structures manually.
• Efficient Context Switching
  Greenlet allows for efficient context switching between tasks, as it operates at the application level rather than relying on the operating system.
• Flexibility
  Developers have the flexibility to implement their own scheduling and control over execution flow using greenlets.
• Integration
  Greenlet integrates well with other asynchronous frameworks such as gevent and can be used to build scalable, concurrent applications.

Possible disadvantages

• No Multi-core Support
  Greenlets run in a single operating system thread, so they do not utilize multiple cores of a CPU. This limits their ability to fully leverage modern multi-core systems.
• Manual Scheduling
  Developers need to manage the scheduling and switching between greenlets manually, which can lead to complex code and potential errors if not handled correctly.
• Debugging Challenges
  Debugging applications that use greenlets can be challenging due to their concurrency model and the lack of native support from some debuggers and profiling tools.
• Compatibility
  Greenlet may not be fully compatible with all Python libraries, especially those that rely on native threads or complex event loops, potentially limiting its use in certain environments.
• Limited Use Cases
  Greenlet is best suited for IO-bound applications and may not offer significant benefits for CPU-bound tasks, where native threading or multiprocessing could be more effective.

• Cross-Platform Support
  Eclipse RAP allows developers to create web applications that are accessible on various platforms without changing the codebase. This is achieved by rendering the application in a web browser, enabling users on any operating system to access the application seamlessly.
• Single Codebase
  With Eclipse RAP, developers can maintain a single codebase for both desktop and web applications. This reduces the complexity and resources needed for maintaining separate versions of an application.
• Rich User Interface
  Eclipse RAP offers a rich set of widgets and tools for creating complex, interactive user interfaces which resemble native desktop applications, enhancing the user experience on web platforms.
• Integration with Eclipse Ecosystem
  Being part of the Eclipse ecosystem, RAP can easily integrate with other Eclipse projects and tools, offering a robust environment for development and extending functionality.
• Mature Framework
  As a well-established framework that's been around for many years, Eclipse RAP benefits from a wealth of documentation, community support, and continuous improvement.

Possible disadvantages

• Learning Curve
  For developers not familiar with the Java and SWT (Standard Widget Toolkit) frameworks, there may be a steep learning curve when adopting Eclipse RAP for the first time.
• Performance Overheads
  When heavily loading an application with complex UI components, the performance might suffer due to the overhead of rendering traditional desktop functionalities in a web browser.
• Limited Modern Web Features
  Eclipse RAP might lack some modern web development features or native support for technologies like HTML5 and CSS3 compared to frameworks that are specifically designed for web applications.
• Dependency on Java
  Since Eclipse RAP is Java-based, it restricts developers to using Java technologies and may not fit into environments where other programming languages or frameworks are preferred.
• Community Size and Resources
  While it is part of the Eclipse ecosystem, RAP may not have as large a community or as many third-party resources and plugins as other more mainstream web development frameworks.

• Project Loom preview ships in JDK 19

  Well, https://github.com/python-greenlet/greenlet has been available for quite some time in Python (gevent probably being its most used flavor). i.e.: just because it's not in the standard library doesn't mean it's not available (so, you... - Source: Hacker News / over 4 years ago

Tracking Eclipse RAP since Mar 2021.