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/*
* Copyright © 2012 The Feign Authors (feign@commonhaus.dev)
*
* 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.InvocationHandlerFactory.MethodHandler;
import feign.Request.Options;
import feign.Target.HardCodedTarget;
import feign.codec.Decoder;
import feign.codec.Encoder;
import feign.codec.ErrorDecoder;
import java.io.IOException;
import java.lang.reflect.Method;
import java.lang.reflect.Type;
/**
* Feign's purpose is to ease development against http apis that feign restfulness. <br>
* In implementation, Feign is a {@link Feign#newInstance factory} for generating {@link Target
* targeted} http apis.
*/
public abstract class Feign {
public static Builder builder() {
return new Builder();
}
/**
* Configuration keys are formatted as unresolved <a href=
* "http://docs.oracle.com/javase/6/docs/jdk/api/javadoc/doclet/com/sun/javadoc/SeeTag.html" >see
* tags</a>. This method exposes that format, in case you need to create the same value as {@link
* MethodMetadata#configKey()} for correlation purposes.
*
* <p>Here are some sample encodings:
*
* <pre>
* <ul>
* <li>{@code
* Route53
* }: would match a class {@code
* route53.Route53
* }</li>
* <li>{@code Route53#list()}: would match a method {@code route53.Route53#list()}</li>
* <li>{@code Route53#listAt(Marker)}: would match a method {@code
* route53.Route53#listAt(Marker)}</li>
* <li>{@code Route53#listByNameAndType(String, String)}: would match a method {@code
* route53.Route53#listAt(String, String)}</li>
* </ul>
* </pre>
*
* Note that there is no whitespace expected in a key!
*
* @param targetType {@link feign.Target#type() type} of the Feign interface.
* @param method invoked method, present on {@code type} or its super.
* @see MethodMetadata#configKey()
*/
public static String configKey(Class targetType, Method method) {
StringBuilder builder = new StringBuilder();
builder.append(targetType.getSimpleName());
builder.append('#').append(method.getName()).append('(');
for (Type param : method.getGenericParameterTypes()) {
param = Types.resolve(targetType, targetType, param);
builder.append(Types.getRawType(param).getSimpleName()).append(',');
}
if (method.getParameterTypes().length > 0) {
builder.deleteCharAt(builder.length() - 1);
}
return builder.append(')').toString();
}
/**
* @deprecated use {@link #configKey(Class, Method)} instead.
*/
@Deprecated
public static String configKey(Method method) {
return configKey(method.getDeclaringClass(), method);
}
/**
* Returns a new instance of an HTTP API, defined by annotations in the {@link Feign Contract},
* for the specified {@code target}. You should cache this result.
*/
public abstract <T> T newInstance(Target<T> target);
public static class Builder extends BaseBuilder<Builder, Feign> {
private Client client = new Client.Default(null, null);
@Override
public Builder logLevel(Logger.Level logLevel) {
return super.logLevel(logLevel);
}
@Override
public Builder contract(Contract contract) {
return super.contract(contract);
}
public Builder client(Client client) {
this.client = client;
return this;
}
@Override
public Builder retryer(Retryer retryer) {
return super.retryer(retryer);
}
@Override
public Builder logger(Logger logger) {
return super.logger(logger);
}
@Override
public Builder encoder(Encoder encoder) {
return super.encoder(encoder);
}
@Override
public Builder decoder(Decoder decoder) {
return super.decoder(decoder);
}
@Override
public Builder queryMapEncoder(QueryMapEncoder queryMapEncoder) {
return super.queryMapEncoder(queryMapEncoder);
}
@Override
public Builder mapAndDecode(ResponseMapper mapper, Decoder decoder) {
return super.mapAndDecode(mapper, decoder);
}
@Deprecated
@Override
public Builder decode404() {
return super.decode404();
}
@Override
public Builder errorDecoder(ErrorDecoder errorDecoder) {
return super.errorDecoder(errorDecoder);
}
@Override
public Builder options(Options options) {
return super.options(options);
}
@Override
public Builder requestInterceptor(RequestInterceptor requestInterceptor) {
return super.requestInterceptor(requestInterceptor);
}
@Override
public Builder requestInterceptors(Iterable<RequestInterceptor> requestInterceptors) {
return super.requestInterceptors(requestInterceptors);
}
@Override
public Builder invocationHandlerFactory(InvocationHandlerFactory invocationHandlerFactory) {
return super.invocationHandlerFactory(invocationHandlerFactory);
}
@Override
public Builder doNotCloseAfterDecode() {
return super.doNotCloseAfterDecode();
}
@Override
public Builder decodeVoid() {
return super.decodeVoid();
}
@Override
public Builder exceptionPropagationPolicy(ExceptionPropagationPolicy propagationPolicy) {
return super.exceptionPropagationPolicy(propagationPolicy);
}
@Override
public Builder addCapability(Capability capability) {
return super.addCapability(capability);
}
public <T> T target(Class<T> apiType, String url) {
return target(new HardCodedTarget<>(apiType, url));
}
public <T> T target(Target<T> target) {
return build().newInstance(target);
}
@Override
public Feign internalBuild() {
final ResponseHandler responseHandler =
new ResponseHandler(
logLevel,
logger,
decoder,
errorDecoder,
dismiss404,
closeAfterDecode,
decodeVoid,
responseInterceptorChain());
MethodHandler.Factory<Object> methodHandlerFactory =
new SynchronousMethodHandler.Factory(
client,
retryer,
requestInterceptors,
responseHandler,
logger,
logLevel,
propagationPolicy,
new RequestTemplateFactoryResolver(encoder, queryMapEncoder),
options);
return new ReflectiveFeign<>(
contract, methodHandlerFactory, invocationHandlerFactory, () -> null);
}
}
public static class ResponseMappingDecoder implements Decoder {
private final ResponseMapper mapper;
private final Decoder delegate;
public ResponseMappingDecoder(ResponseMapper mapper, Decoder decoder) {
this.mapper = mapper;
this.delegate = decoder;
}
@Override
public Object decode(Response response, Type type) throws IOException {
return delegate.decode(mapper.map(response, type), type);
}
}
}