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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 java.lang.reflect.Method;
import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Set;
import javax.inject.Inject;
import javax.net.ssl.HostnameVerifier;
import javax.net.ssl.HttpsURLConnection;
import javax.net.ssl.SSLSocketFactory;
import dagger.ObjectGraph;
import dagger.Provides;
import feign.Logger.NoOpLogger;
import feign.Request.Options;
import feign.Target.HardCodedTarget;
import feign.codec.Decoder;
import feign.codec.Encoder;
import feign.codec.ErrorDecoder;
/**
* 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();
}
public static <T> T create(Class<T> apiType, String url, Object... modules) {
return create(new HardCodedTarget<T>(apiType, url), modules);
}
/**
* Shortcut to {@link #newInstance(Target) create} a single {@code targeted} http api using {@link
* ReflectiveFeign reflection}.
*/
public static <T> T create(Target<T> target, Object... modules) {
return create(modules).newInstance(target);
}
/**
* Returns a {@link ReflectiveFeign reflective} factory for generating {@link Target targeted}
* http apis.
*/
public static Feign create(Object... modules) {
return ObjectGraph.create(modulesForGraph(modules).toArray()).get(Feign.class);
}
/**
* Returns an {@link ObjectGraph Dagger ObjectGraph} that can inject a {@link ReflectiveFeign
* reflective} Feign.
*/
public static ObjectGraph createObjectGraph(Object... modules) {
return ObjectGraph.create(modulesForGraph(modules).toArray());
}
/**
* <br> 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>. <br> For example. <ul> <li>{@code Route53}: would match a class such as {@code
* denominator.route53.Route53} <li>{@code Route53#list()}: would match a method such as {@code
* denominator.route53.Route53#list()} <li>{@code Route53#listAt(Marker)}: would match a method
* such as {@code denominator.route53.Route53#listAt(denominator.route53.Marker)} <li>{@code
* Route53#listByNameAndType(String, String)}: would match a method such as {@code
* denominator.route53.Route53#listAt(String, String)} </ul> <br> 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.
*/
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();
}
private static List<Object> modulesForGraph(Object... modules) {
List<Object> modulesForGraph = new ArrayList<Object>(2);
modulesForGraph.add(new Defaults());
if (modules != null) {
for (Object module : modules) {
modulesForGraph.add(module);
}
}
return modulesForGraph;
}
/**
* @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);
@SuppressWarnings("rawtypes")
// incomplete as missing Encoder/Decoder
@dagger.Module(injects = {Feign.class,
Builder.class}, complete = false, includes = ReflectiveFeign.Module.class)
public static class Defaults {
@Provides
Contract contract() {
return new Contract.Default();
}
@Provides
Logger.Level logLevel() {
return Logger.Level.NONE;
}
@Provides
Logger noOp() {
return new NoOpLogger();
}
@Provides
Retryer retryer() {
return new Retryer.Default();
}
@Provides
ErrorDecoder errorDecoder() {
return new ErrorDecoder.Default();
}
@Provides
Options options() {
return new Options();
}
@Provides
SSLSocketFactory sslSocketFactory() {
return SSLSocketFactory.class.cast(SSLSocketFactory.getDefault());
}
@Provides
HostnameVerifier hostnameVerifier() {
return HttpsURLConnection.getDefaultHostnameVerifier();
}
@Provides
Client httpClient(Client.Default client) {
return client;
}
@Provides
InvocationHandlerFactory invocationHandlerFactory() {
return new InvocationHandlerFactory.Default();
}
}
@dagger.Module(injects = Feign.class, includes = ReflectiveFeign.Module.class)
public static class Builder {
private final Set<RequestInterceptor>
requestInterceptors =
new LinkedHashSet<RequestInterceptor>();
@Inject
Logger.Level logLevel;
@Inject
Contract contract;
@Inject
Client client;
@Inject
Retryer retryer;
@Inject
Logger logger;
Encoder encoder = new Encoder.Default();
Decoder decoder = new Decoder.Default();
@Inject
ErrorDecoder errorDecoder;
@Inject
Options options;
@Inject
InvocationHandlerFactory invocationHandlerFactory;
Builder() {
ObjectGraph.create(new Defaults()).inject(this);
}
public Builder logLevel(Logger.Level logLevel) {
this.logLevel = logLevel;
return this;
}
public Builder contract(Contract contract) {
this.contract = contract;
return this;
}
public Builder client(Client client) {
this.client = client;
return this;
}
public Builder retryer(Retryer retryer) {
this.retryer = retryer;
return this;
}
public Builder logger(Logger logger) {
this.logger = logger;
return this;
}
public Builder encoder(Encoder encoder) {
this.encoder = encoder;
return this;
}
public Builder decoder(Decoder decoder) {
this.decoder = decoder;
return this;
}
public Builder errorDecoder(ErrorDecoder errorDecoder) {
this.errorDecoder = errorDecoder;
return this;
}
public Builder options(Options options) {
this.options = options;
return this;
}
/**
* Adds a single request interceptor to the builder.
*/
public Builder requestInterceptor(RequestInterceptor requestInterceptor) {
this.requestInterceptors.add(requestInterceptor);
return this;
}
/**
* Sets the full set of request interceptors for the builder, overwriting any previous
* interceptors.
*/
public Builder requestInterceptors(Iterable<RequestInterceptor> requestInterceptors) {
this.requestInterceptors.clear();
for (RequestInterceptor requestInterceptor : requestInterceptors) {
this.requestInterceptors.add(requestInterceptor);
}
return this;
}
/**
* Allows you to override how reflective dispatch works inside of Feign.
*/
public Builder invocationHandlerFactory(InvocationHandlerFactory invocationHandlerFactory) {
this.invocationHandlerFactory = invocationHandlerFactory;
return this;
}
public <T> T target(Class<T> apiType, String url) {
return build().newInstance(new HardCodedTarget<T>(apiType, url));
}
public <T> T target(Target<T> target) {
return build().newInstance(target);
}
public Feign build() {
return ObjectGraph.create(this).get(Feign.class);
}
@Provides
Logger.Level logLevel() {
return logLevel;
}
@Provides
Contract contract() {
return contract;
}
@Provides
Client client() {
return client;
}
@Provides
Retryer retryer() {
return retryer;
}
@Provides
Logger logger() {
return logger;
}
@Provides
Encoder encoder() {
return encoder;
}
@Provides
Decoder decoder() {
return decoder;
}
@Provides
ErrorDecoder errorDecoder() {
return errorDecoder;
}
@Provides
Options options() {
return options;
}
@Provides(type = Provides.Type.SET_VALUES)
Set<RequestInterceptor> requestInterceptors() {
return requestInterceptors;
}
@Provides
InvocationHandlerFactory invocationHandlerFactory() {
return invocationHandlerFactory;
}
}
}