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ServerBuilderSyntax.scala
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ServerBuilderSyntax.scala
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/*
* Copyright (c) 2018 Gary Coady / Fs2 Grpc Developers
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of
* this software and associated documentation files (the "Software"), to deal in
* the Software without restriction, including without limitation the rights to
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
* the Software, and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
package fs2
package grpc
package syntax
import java.util.concurrent.TimeUnit
import scala.concurrent._
import cats.effect._
import io.grpc.{Server, ServerBuilder}
trait ServerBuilderSyntax {
implicit final def fs2GrpcSyntaxServerBuilder[SB <: ServerBuilder[SB]](builder: SB): ServerBuilderOps[SB] =
new ServerBuilderOps[SB](builder)
}
final class ServerBuilderOps[SB <: ServerBuilder[SB]](val builder: SB) extends AnyVal {
/** Builds a `Server` into a resource. The server is shut down when the resource is released. Shutdown is as follows:
*
* 1. We request an orderly shutdown, allowing preexisting calls to continue without accepting new calls. 2. We
* block for up to 30 seconds on termination, using the blocking context 3. If the server is not yet terminated,
* we trigger a forceful shutdown
*
* For different tradeoffs in shutdown behavior, see {{resourceWithShutdown}}.
*/
def resource[F[_]](implicit F: Sync[F]): Resource[F, Server] =
resourceWithShutdown { server =>
F.delay {
server.shutdown()
if (!blocking(server.awaitTermination(30, TimeUnit.SECONDS))) {
server.shutdownNow()
()
}
}
}
/** Builds a `Server` into a resource. The server is shut down when the resource is released.
*
* @param shutdown
* Determines the behavior of the cleanup of the server, with respect to forceful vs. graceful shutdown and how to
* poll or block for termination.
*/
def resourceWithShutdown[F[_]](shutdown: Server => F[Unit])(implicit F: Sync[F]): Resource[F, Server] =
Resource.make(F.delay(builder.build()))(shutdown)
/** Builds a `Server` into a stream. The server is shut down when the stream is complete. Shutdown is as follows:
*
* 1. We request an orderly shutdown, allowing preexisting calls to continue without accepting new calls. 2. We
* block for up to 30 seconds on termination, using the blocking context 3. If the server is not yet terminated,
* we trigger a forceful shutdown
*
* For different tradeoffs in shutdown behavior, see {{streamWithShutdown}}.
*/
def stream[F[_]](implicit F: Async[F]): Stream[F, Server] =
Stream.resource(resource[F])
/** Builds a `Server` into a stream. The server is shut down when the stream is complete.
*
* @param shutdown
* Determines the behavior of the cleanup of the server, with respect to forceful vs. graceful shutdown and how to
* poll or block for termination.
*/
def streamWithShutdown[F[_]](shutdown: Server => F[Unit])(implicit F: Async[F]): Stream[F, Server] =
Stream.resource(resourceWithShutdown(shutdown))
}