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commit 5322274e4d787570840370a76fd2047c68157bd1
Author: Rene Cordier <rcord...@linagora.com>
AuthorDate: Fri Feb 28 11:06:27 2020 +0700
JAMES-3078 ADR for Reactor-netty adoption for JMAP server implementation
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+# 19. Reactor-netty adoption for JMAP server implementation
+
+Date: 2020-02-28
+
+## Status
+
+Accepted (lazy consensus)
+
+## Context
+
+After adopting the last specifications of JMAP (see
+[new JMAP specifications adoption
ADR](https://github.com/apache/james-project/blob/master/src/adr/0018-jmap-new-specs.md)),
+it was agreed that we need to be able to serve both `jmap-draft` and the new
`jmap` with a reactive server.
+
+The current outdated implementation of JMAP in James is currently using a
non-reactive [Jetty server](https://www.eclipse.org/jetty/).
+
+There are many possible candidates as reactive servers. Among the most popular
ones for Java:
+
+* [Spring](https://spring.io)
+* [Reactor-netty](https://github.com/reactor/reactor-netty)
+* [Akka HTTP](https://doc.akka.io/docs/akka-http/current/introduction.html)
+* ...
+
+## Decision
+
+We decide to use `reactor-netty` for the following reasons:
+
+* It's a reactive server
+* It's using [Reactor](https://projectreactor.io/), which is the same
technology that we use in the rest of our codebase
+* Implementing JMAP does not require high level HTTP server features
+
+## Consequences
+
+* Porting current `jmap-draft` to use a `reactor-netty` server instead of a
Jetty server
+* The `reactor-netty` server should serve as well the new `jmap` implementation
+* We will be able to refactor and get end-to-end reactive operations for JMAP,
unlocking performance gains
+
+## References
+
+* JIRA: [JAMES-3078](https://issues.apache.org/jira/browse/JAMES-3078)
+* JMAP new specifications adoption ADR:
https://github.com/apache/james-project/blob/master/src/adr/0018-jmap-new-specs.md
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