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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 dagger.Lazy;
import feign.Request.Options;
import feign.codec.DecodeException;
import feign.codec.Decoder;
import feign.codec.ErrorDecoder;
import feign.codec.IncrementalDecoder;
import javax.inject.Inject;
import javax.inject.Named;
import javax.inject.Provider;
import java.io.IOException;
import java.io.Reader;
import java.util.concurrent.Executor;
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;
abstract class MethodHandler {
/**
* same approach as retrofit: temporarily rename threads
*/
static final String THREAD_PREFIX = "Feign-";
static final String IDLE_THREAD_NAME = THREAD_PREFIX + "Idle";
/**
* Those using guava will implement as {@code Function<Object[], RequestTemplate>}.
*/
static interface BuildTemplateFromArgs {
public RequestTemplate apply(Object[] argv);
}
static class Factory {
private final Client client;
private final Lazy<Executor> httpExecutor;
private final Provider<Retryer> retryer;
private final Logger logger;
private final Provider<Logger.Level> logLevel;
@Inject Factory(Client client, @Named("http") Lazy<Executor> httpExecutor, Provider<Retryer> retryer, Logger logger,
Provider<Logger.Level> logLevel) {
this.client = checkNotNull(client, "client");
this.httpExecutor = checkNotNull(httpExecutor, "httpExecutor");
this.retryer = checkNotNull(retryer, "retryer");
this.logger = checkNotNull(logger, "logger");
this.logLevel = checkNotNull(logLevel, "logLevel");
}
public MethodHandler create(Target<?> target, MethodMetadata md, BuildTemplateFromArgs buildTemplateFromArgs,
Options options, Decoder.TextStream<?> decoder, ErrorDecoder errorDecoder) {
return new SynchronousMethodHandler(target, client, retryer, logger, logLevel, md, buildTemplateFromArgs, options,
decoder, errorDecoder);
}
public MethodHandler create(Target<?> target, MethodMetadata md, BuildTemplateFromArgs buildTemplateFromArgs,
Options options, IncrementalDecoder.TextStream<?> incrementalCallbackDecoder,
ErrorDecoder errorDecoder) {
return new IncrementalCallbackMethodHandler(target, client, retryer, logger, logLevel, md, buildTemplateFromArgs,
options, incrementalCallbackDecoder, errorDecoder, httpExecutor);
}
}
static final class IncrementalCallbackMethodHandler extends MethodHandler {
private final Lazy<Executor> httpExecutor;
private final IncrementalDecoder.TextStream<?> incDecoder;
private IncrementalCallbackMethodHandler(Target<?> target, Client client, Provider<Retryer> retryer, Logger logger,
Provider<Logger.Level> logLevel, MethodMetadata metadata,
BuildTemplateFromArgs buildTemplateFromArgs, Options options,
IncrementalDecoder.TextStream<?> incDecoder, ErrorDecoder errorDecoder,
Lazy<Executor> httpExecutor) {
super(target, client, retryer, logger, logLevel, metadata, buildTemplateFromArgs, options, errorDecoder);
this.httpExecutor = checkNotNull(httpExecutor, "httpExecutor for %s", target);
this.incDecoder = checkNotNull(incDecoder, "incrementalCallbackDecoder for %s", target);
}
@Override public Object invoke(final Object[] argv) throws Throwable {
httpExecutor.get().execute(new Runnable() {
@Override public void run() {
Error error = null;
Object arg = argv[metadata.incrementalCallbackIndex()];
IncrementalCallback<Object> incrementalCallback = IncrementalCallback.class.cast(arg);
try {
IncrementalCallbackMethodHandler.super.invoke(argv);
incrementalCallback.onSuccess();
} catch (Error cause) {
// assign to a variable in case .onFailure throws a RTE
error = cause;
incrementalCallback.onFailure(cause);
} catch (Throwable cause) {
incrementalCallback.onFailure(cause);
} finally {
Thread.currentThread().setName(IDLE_THREAD_NAME);
if (error != null)
throw error;
}
}
});
return null; // void.
}
@Override protected Object decode(Object[] argv, Response response) throws Throwable {
Object arg = argv[metadata.incrementalCallbackIndex()];
IncrementalCallback<Object> incrementalCallback = IncrementalCallback.class.cast(arg);
if (metadata.decodeInto().equals(Response.class)) {
incrementalCallback.onNext(response);
} else if (metadata.decodeInto() != Void.class) {
Response.Body body = response.body();
if (body == null)
return null;
Reader reader = body.asReader();
try {
incDecoder.decode(reader, metadata.decodeInto(), incrementalCallback);
} finally {
ensureClosed(body);
}
}
return null; // void
}
@Override protected Request targetRequest(RequestTemplate template) {
Request request = super.targetRequest(template);
Thread.currentThread().setName(THREAD_PREFIX + metadata.configKey());
return request;
}
}
static final class SynchronousMethodHandler extends MethodHandler {
private final Decoder.TextStream<?> decoder;
private SynchronousMethodHandler(Target<?> target, Client client, Provider<Retryer> retryer, Logger logger,
Provider<Logger.Level> logLevel, MethodMetadata metadata,
BuildTemplateFromArgs buildTemplateFromArgs, Options options,
Decoder.TextStream<?> decoder, ErrorDecoder errorDecoder) {
super(target, client, retryer, logger, logLevel, metadata, buildTemplateFromArgs, options, errorDecoder);
this.decoder = checkNotNull(decoder, "decoder for %s", target);
}
@Override protected Object decode(Object[] argv, Response response) throws Throwable {
if (metadata.decodeInto().equals(Response.class)) {
return response;
} else if (metadata.decodeInto() == void.class || response.body() == null) {
return null;
}
try {
return decoder.decode(response.body().asReader(), metadata.decodeInto());
} catch (FeignException e) {
throw e;
} catch (RuntimeException e) {
throw new DecodeException(e.getMessage(), e);
}
}
}
protected final MethodMetadata metadata;
protected final Target<?> target;
protected final Client client;
protected final Provider<Retryer> retryer;
protected final Logger logger;
protected final Provider<Logger.Level> logLevel;
protected final BuildTemplateFromArgs buildTemplateFromArgs;
protected final Options options;
protected final ErrorDecoder errorDecoder;
private MethodHandler(Target<?> target, Client client, Provider<Retryer> retryer, Logger logger,
Provider<Logger.Level> logLevel, MethodMetadata metadata,
BuildTemplateFromArgs buildTemplateFromArgs, Options options,
ErrorDecoder errorDecoder) {
this.target = checkNotNull(target, "target");
this.client = checkNotNull(client, "client for %s", target);
this.retryer = checkNotNull(retryer, "retryer 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);
}
public Object invoke(Object[] argv) throws Throwable {
RequestTemplate template = buildTemplateFromArgs.apply(argv);
Retryer retryer = this.retryer.get();
while (true) {
try {
return executeAndDecode(argv, template);
} catch (RetryableException e) {
retryer.continueOrPropagate(e);
if (logLevel.get() != Logger.Level.NONE) {
logger.logRetry(metadata.configKey(), logLevel.get());
}
continue;
}
}
}
public Object executeAndDecode(Object[] argv, 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) {
return decode(argv, 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());
}
}
protected Request targetRequest(RequestTemplate template) {
return target.apply(new RequestTemplate(template));
}
protected long elapsedTime(long start) {
return TimeUnit.NANOSECONDS.toMillis(System.nanoTime() - start);
}
protected abstract Object decode(Object[] argv, Response response) throws Throwable;
}