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AsyncClient.java
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101 lines (89 loc) · 3.5 KB
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/**
* Copyright 2012-2020 The Feign 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 feign;
import java.util.Optional;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Future;
import feign.Request.Options;
/**
* Submits HTTP {@link Request requests} asynchronously, with an optional context.
*/
@Experimental
public interface AsyncClient<C> {
/**
* Executes the request asynchronously. Calling {@link CompletableFuture#cancel(boolean)} on the
* result may cause the execution to be cancelled / aborted, but this is not guaranteed.
*
* @param request safe to replay
* @param options options to apply to this request
* @param requestContext - the optional context, for example for storing session cookies. The
* client should update this appropriately based on the received response before completing
* the result.
* @return a {@link CompletableFuture} to be completed with the response, or completed
* exceptionally otherwise, for example with an {@link java.io.IOException} on a network
* error connecting to {@link Request#url()}.
*/
CompletableFuture<Response> execute(Request request, Options options, Optional<C> requestContext);
class Default<C> implements AsyncClient<C> {
private final Client client;
private final ExecutorService executorService;
public Default(Client client, ExecutorService executorService) {
this.client = client;
this.executorService = executorService;
}
@Override
public CompletableFuture<Response> execute(Request request,
Options options,
Optional<C> requestContext) {
final CompletableFuture<Response> result = new CompletableFuture<>();
final Future<?> future = executorService.submit(() -> {
try {
result.complete(client.execute(request, options));
} catch (final Exception e) {
result.completeExceptionally(e);
}
});
result.whenComplete((response, throwable) -> {
if (result.isCancelled()) {
future.cancel(true);
}
});
return result;
}
}
/**
* A synchronous implementation of {@link AsyncClient}
*
* @param <C> - unused context; synchronous clients handle context internally
*/
class Pseudo<C> implements AsyncClient<C> {
private final Client client;
public Pseudo(Client client) {
this.client = client;
}
@Override
public CompletableFuture<Response> execute(Request request,
Options options,
Optional<C> requestContext) {
final CompletableFuture<Response> result = new CompletableFuture<>();
try {
result.complete(client.execute(request, options));
} catch (final Exception e) {
result.completeExceptionally(e);
}
return result;
}
}
}