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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.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;
import javax.inject.Inject;
import javax.net.ssl.HostnameVerifier;
import javax.net.ssl.HttpsURLConnection;
import javax.net.ssl.SSLSocketFactory;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Set;
/**
* 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 {
/**
* 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 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());
}
@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 feign.Client httpClient(feign.Client.Default client) {
return client;
}
}
/**
* <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!
*/
public static String configKey(Method method) {
StringBuilder builder = new StringBuilder();
builder.append(method.getDeclaringClass().getSimpleName());
builder.append('#').append(method.getName()).append('(');
for
BA8F
(Class<?> param : method.getParameterTypes())
builder.append(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;
}
@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;
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;
}
public <T> T target(Class<T> apiType, String url) {
return target(new HardCodedTarget<T>(apiType, url));
}
public <T> T target(Target<T> target) {
return ObjectGraph.create(this).get(Feign.class).newInstance(target);
}
@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;
}
}
}