trait ServerApp extends AnyRef
Starts a server and gracefully terminates at shutdown. The server
is terminated and the shutdown task is run either by a JVM shutdown
hook or an invocation of requestShutdown()
.
If the server fails to start, the shutdown
task is not invoked.
More robust resource management is possible through ProcessApp
or
StreamApp
, which are introduced in http4s-0.16 and http4s-0.17,
respectively.
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- ServerApp.scala
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- def ensuring(cond: (ServerApp) ⇒ Boolean): ServerApp
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def
requestShutdown(): Unit
Explicitly request a graceful shutdown of the service.
Explicitly request a graceful shutdown of the service.
There is no operational standard for this, but some common implementations include:
- an admin port receiving a connection
- a JMX command
- monitoring a file
- console input in an interactive session
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def
shutdown(server: Server): Task[Unit]
Return a task to shutdown the application.
Return a task to shutdown the application.
This task is run as a JVM shutdown hook, or when org.http4s.server.ServerApp.requestShutdown is explicitly called.
The default implementation shuts down the server, and waits for it to finish. Other resources may shutdown by flatMapping this task.
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