Apache Wave

Apache Wave. It is an open-source software framework and communication protocol designed for real-time collaborative editing and communication. Originally developed by Google as Google Wave, the project was later donated to the Apache Software Foundation where it continued development as an incubator project. The platform combines elements of email, instant messaging, wikis, and social networking into a unified, concurrent model.

History

The project was initially announced by Google at the Google I/O conference in 2009, generating significant interest for its innovative approach to online collaboration. Following its public launch, the service struggled to gain widespread user adoption, leading Google to announce the end of its development as a standalone product in 2010. The codebase was subsequently donated to the Apache Software Foundation in late 2010, entering the Apache Incubator to transition into a community-driven open-source project. Under the stewardship of the Apache Software Foundation, it was rebranded and development continued with a focus on the underlying protocol and federated capabilities, culminating in its graduation from the incubator as a top-level Apache project in 2018.

Technology and architecture

The system is built upon a robust operational transformation engine, a technology pioneered for applications like Google Docs, which manages concurrent edits by multiple users. Its core communication protocol, the Wave Federation Protocol, is an open extension of the Extensible Messaging and Presence Protocol designed to enable real-time synchronization across different server instances. The architecture is highly modular, separating the wave model, operational transformation engine, and client-server protocol into distinct layers. The reference server implementation, known as Wave in a Box, is written primarily in Java, while early web clients were built using the Google Web Toolkit.

Features

A defining feature is the wave itself, a shared digital document that supports rich text, gadgets, and robots, allowing multiple participants to edit and communicate in real-time. The platform includes playback functionality, letting users rewind the evolution of a document to see every edit and comment in chronological order. It supports embedded applications and automated agents that can interact with content, providing services like language translation or polling within a wave. Real-time typing visibility, where characters appear as they are typed by other collaborators, was a hallmark of the original user experience.

Applications and use cases

The framework has been utilized for specific collaborative document editing scenarios within academic and software development communities, such as co-authoring research papers or technical specifications. Its federated protocol design made it a candidate for building decentralized, real-time communication platforms, inspiring projects in the Matrix (protocol) ecosystem. Some organizations have deployed private wave servers for internal team collaboration, leveraging its strong audit trail and integrated communication features. The underlying operational transformation components have also been studied and used as a library for adding collaborative features to other web applications.

Development and community

After the transition to the Apache Software Foundation, development was driven by a smaller, dedicated community of volunteers rather than the large corporate team at Google. The project maintained its presence through mailing lists, an ApacheCon booth, and its repository on GitHub, focusing on protocol stability and server implementation. Key milestones included refining the Wave Federation Protocol specification and improving the Wave in a Box server for easier deployment. While not achieving the mass adoption of its initial vision, the project contributed significantly to open standards for real-time collaboration and influenced subsequent technologies like Etherpad and Confluence (software).

Category:Apache Software Foundation projects Category:Collaborative software Category:Communication software