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/*
* Copyright 2014 The gRPC Authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.ratis.thirdparty.io.grpc;
import java.io.IOException;
import java.net.SocketAddress;
import java.util.Collections;
import java.util.List;
import java.util.concurrent.TimeUnit;
import javax.annotation.concurrent.ThreadSafe;
/**
* Server for listening for and dispatching incoming calls. It is not expected to be implemented by
* application code or interceptors.
*/
@ThreadSafe
public abstract class Server {
/**
* Key for accessing the {@link Server} instance inside server RPC {@link Context}. It's
* unclear to us what users would need. If you think you need to use this, please file an
* issue for us to discuss a public API.
*/
static final Context.Key SERVER_CONTEXT_KEY =
Context.key("org.apache.ratis.thirdparty.io.grpc.Server");
/**
* Bind and start the server. After this call returns, clients may begin connecting to the
* listening socket(s).
*
* @return {@code this} object
* @throws IllegalStateException if already started or shut down
* @throws IOException if unable to bind
* @since 1.0.0
*/
public abstract Server start() throws IOException;
/**
* Returns the port number the server is listening on. This can return -1 if there is no actual
* port or the result otherwise does not make sense. Result is undefined after the server is
* terminated. If there are multiple possible ports, this will return one arbitrarily.
* Implementations are encouraged to return the same port on each call.
*
* @see #getListenSockets()
* @throws IllegalStateException if the server has not yet been started.
* @since 1.0.0
*/
public int getPort() {
return -1;
}
/**
* Returns a list of listening sockets for this server. May be different than the originally
* requested sockets (e.g. listening on port '0' may end up listening on a different port).
* The list is unmodifiable.
*
* @throws IllegalStateException if the server has not yet been started.
* @since 1.19.0
*/
@ExperimentalApi("https://github.com/grpc/grpc-java/issues/5332")
public List getListenSockets() {
throw new UnsupportedOperationException();
}
/**
* Returns all services registered with the server, or an empty list if not supported by the
* implementation.
*
* @since 1.1.0
*/
@ExperimentalApi("https://github.com/grpc/grpc-java/issues/2222")
public List getServices() {
return Collections.emptyList();
}
/**
* Returns immutable services registered with the server, or an empty list if not supported by the
* implementation.
*
* @since 1.1.0
*/
@ExperimentalApi("https://github.com/grpc/grpc-java/issues/2222")
public List getImmutableServices() {
return Collections.emptyList();
}
/**
* Returns mutable services registered with the server, or an empty list if not supported by the
* implementation.
*
* @since 1.1.0
*/
@ExperimentalApi("https://github.com/grpc/grpc-java/issues/2222")
public List getMutableServices() {
return Collections.emptyList();
}
/**
* Initiates an orderly shutdown in which preexisting calls continue but new calls are rejected.
* After this call returns, this server has released the listening socket(s) and may be reused by
* another server.
*
* Note that this method will not wait for preexisting calls to finish before returning.
* {@link #awaitTermination()} or {@link #awaitTermination(long, TimeUnit)} needs to be called to
* wait for existing calls to finish.
*
*
Calling this method before {@code start()} will shut down and terminate the server like
* normal, but prevents starting the server in the future.
*
* @return {@code this} object
* @since 1.0.0
*/
public abstract Server shutdown();
/**
* Initiates a forceful shutdown in which preexisting and new calls are rejected. Although
* forceful, the shutdown process is still not instantaneous; {@link #isTerminated()} will likely
* return {@code false} immediately after this method returns. After this call returns, this
* server has released the listening socket(s) and may be reused by another server.
*
*
Calling this method before {@code start()} will shut down and terminate the server like
* normal, but prevents starting the server in the future.
*
* @return {@code this} object
* @since 1.0.0
*/
public abstract Server shutdownNow();
/**
* Returns whether the server is shutdown. Shutdown servers reject any new calls, but may still
* have some calls being processed.
*
* @see #shutdown()
* @see #isTerminated()
* @since 1.0.0
*/
public abstract boolean isShutdown();
/**
* Returns whether the server is terminated. Terminated servers have no running calls and
* relevant resources released (like TCP connections).
*
* @see #isShutdown()
* @since 1.0.0
*/
public abstract boolean isTerminated();
/**
* Waits for the server to become terminated, giving up if the timeout is reached.
*
*
Calling this method before {@code start()} or {@code shutdown()} is permitted and does not
* change its behavior.
*
* @return whether the server is terminated, as would be done by {@link #isTerminated()}.
*/
public abstract boolean awaitTermination(long timeout, TimeUnit unit) throws InterruptedException;
/**
* Waits for the server to become terminated.
*
*
Calling this method before {@code start()} or {@code shutdown()} is permitted and does not
* change its behavior.
*
* @since 1.0.0
*/
public abstract void awaitTermination() throws InterruptedException;
}