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MethodHandler.java
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/*
* Copyright 2013 Netflix, Inc.
*
* 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 feign.Request.Options;
import feign.codec.DecodeException;
import feign.codec.Decoder;
import feign.codec.ErrorDecoder;
import javax.inject.Inject;
import javax.inject.Provider;
import java.io.IOException;
import java.util.Set;
import java.util.concurrent.TimeUnit;
import static feign.FeignException.errorExecuting;
import static feign.FeignException.errorReading;
import static feign.Util.checkNotNull;
import static feign.Util.ensureClosed;
interface MethodHandler {
Object invoke(Object[] argv) throws Throwable;
static class Factory {
private final Client client;
private final Provider<Retryer> retryer;
private final Set<RequestInterceptor> requestInterceptors;
private final Logger logger;
private final Provider<Logger.Level> logLevel;
@Inject Factory(Client client, Provider<Retryer> retryer, Set<RequestInterceptor> requestInterceptors,
Logger logger, Provider<Logger.Level> logLevel) {
this.client = checkNotNull(client, "client");
this.retryer = checkNotNull(retryer, "retryer");
this.requestInterceptors = checkNotNull(requestInterceptors, "requestInterceptors");
this.logger = checkNotNull(logger, "logger");
this.logLevel = checkNotNull(logLevel, "logLevel");
}
public MethodHandler create(Target<?> target, MethodMetadata md, BuildTemplateFromArgs buildTemplateFromArgs,
Options options, Decoder decoder, ErrorDecoder errorDecoder) {
return new SynchronousMethodHandler(target, client, retryer, requestInterceptors, logger, logLevel, md,
buildTemplateFromArgs, options, decoder, errorDecoder);
}
}
/**
* Those using guava will implement as {@code Function<Object[], RequestTemplate>}.
*/
interface BuildTemplateFromArgs {
public RequestTemplate apply(Object[] argv);
}
static final class SynchronousMethodHandler implements MethodHandler {
private final MethodMetadata metadata;
private final Target<?> target;
private final Client client;
private final Provider<Retryer> retryer;
private final Set<RequestInterceptor> requestInterceptors;
private final Logger logger;
private final Provider<Logger.Level> logLevel;
private final BuildTemplateFromArgs buildTemplateFromArgs;
private final Options options;
private final Decoder decoder;
private final ErrorDecoder errorDecoder;
private SynchronousMethodHandler(Target<?> target, Client client, Provider<Retryer> retryer,
Set<RequestInterceptor> requestInterceptors, Logger logger,
Provider<Logger.Level> logLevel, MethodMetadata metadata,
BuildTemplateFromArgs buildTemplateFromArgs, Options options,
Decoder decoder, ErrorDecoder errorDecoder) {
this.target = checkNotNull(target, "target");
this.client = checkNotNull(client, "client for %s", target);
this.retryer = checkNotNull(retryer, "retryer for %s", target);
this.requestInterceptors = checkNotNull(requestInterceptors, "requestInterceptors for %s", target);
this.logger = checkNotNull(logger, "logger for %s", target);
this.logLevel = checkNotNull(logLevel, "logLevel for %s", target);
this.metadata = checkNotNull(metadata, "metadata for %s", target);
this.buildTemplateFromArgs = checkNotNull(buildTemplateFromArgs, "metadata for %s", target);
this.options = checkNotNull(options, "options for %s", target);
this.errorDecoder = checkNotNull(errorDecoder, "errorDecoder for %s", target);
this.decoder = checkNotNull(decoder, "decoder for %s", target);
}
@Override public Object invoke(Object[] argv) throws Throwable {
RequestTemplate template = buildTemplateFromArgs.apply(argv);
Retryer retryer = this.retryer.get();
while (true) {
try {
return executeAndDecode(template);
} catch (RetryableException e) {
retryer.continueOrPropagate(e);
if (logLevel.get() != Logger.Level.NONE) {
logger.logRetry(metadata.configKey(), logLevel.get());
}
continue;
}
}
}
Object executeAndDecode(RequestTemplate template) throws Throwable {
Request request = targetRequest(template);
if (logLevel.get() != Logger.Level.NONE) {
logger.logRequest(metadata.configKey(), logLevel.get(), request);
}
Response response;
long start = System.nanoTime();
try {
response = client.execute(request, options);
} catch (IOException e) {
if (logLevel.get() != Logger.Level.NONE) {
logger.logIOException(metadata.configKey(), logLevel.get(), e, elapsedTime(start));
}
throw errorExecuting(request, e);
}
long elapsedTime = TimeUnit.NANOSECONDS.toMillis(System.nanoTime() - start);
try {
if (logLevel.get() != Logger.Level.NONE) {
response = logger.logAndRebufferResponse(metadata.configKey(), logLevel.get(), response, elapsedTime);
}
if (response.status() >= 200 && response.status() < 300) {
if (Response.class == metadata.returnType()) {
if (response.body() == null) {
return response;
}
String bodyString = Util.toString(response.body().asReader());
return Response.create(response.status(), response.reason(), response.headers(), bodyString);
} else if (void.class == metadata.returnType()) {
return null;
} else {
return decode(response);
}
} else {
throw errorDecoder.decode(metadata.configKey(), response);
}
} catch (IOException e) {
if (logLevel.get() != Logger.Level.NONE) {
logger.logIOException(metadata.configKey(), logLevel.get(), e, elapsedTime);
}
throw errorReading(request, response, e);
} finally {
ensureClosed(response.body());
}
}
long elapsedTime(long start) {
return TimeUnit.NANOSECONDS.toMillis(System.nanoTime() - start);
}
Request targetRequest(RequestTemplate template) {
for (RequestInterceptor interceptor : requestInterceptors) {
interceptor.apply(template);
}
return target.apply(new RequestTemplate(template));
}
Object decode(Response response) throws Throwable {
try {
return decoder.decode(response, metadata.returnType());
} catch (FeignException e) {
throw e;
} catch (RuntimeException e) {
throw new DecodeException(e.getMessage(), e);
}
}
}
}