/
ExecutionStrategyClient.java
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/
ExecutionStrategyClient.java
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/*
* Copyright © 2021 Apple Inc. and the ServiceTalk project 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 io.servicetalk.examples.grpc.strategies;
import io.servicetalk.grpc.netty.GrpcClients;
import io.grpc.examples.strategies.Greeter;
import io.grpc.examples.strategies.HelloRequest;
import java.util.stream.IntStream;
/**
* Extends the async "Hello World" example to demonstrate support for alternative execution strategies and executors.
* <p>
* Start the {@link ExecutionStrategyServer} first.
*/
public final class ExecutionStrategyClient {
private static void sayHello(int port) throws Exception {
try (Greeter.GreeterClient client =
GrpcClients.forAddress("localhost", port).build(new Greeter.ClientFactory())) {
client.sayHello(HelloRequest.newBuilder().setName("World").build())
.whenOnSuccess(reply -> System.out.println(port + " : " + reply))
// This example is demonstrating asynchronous execution, but needs to prevent the main thread from
// exiting before the response has been processed. This isn't typical usage for an asynchronous API
// but is useful for demonstration purposes.
.toFuture().get();
}
}
public static void main(String... args) {
// Execute the same client request for each of the server variations.
IntStream.rangeClosed(8080, 8088).forEach(port -> {
try {
ExecutionStrategyClient.sayHello(port);
} catch (Throwable all) {
System.err.println("\nUnexpected throwable for port: " + port);
all.printStackTrace(System.err);
}
});
}
}