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Feign.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 java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import javax.net.ssl.SSLSocketFactory;
import dagger.ObjectGraph;
import dagger.Provides;
import feign.Request.Options;
import feign.Target.HardCodedTarget;
import feign.Wire.NoOpWire;
import feign.codec.BodyEncoder;
import feign.codec.Decoder;
import feign.codec.ErrorDecoder;
import feign.codec.FormEncoder;
/**
* 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 <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());
}
@dagger.Module(complete = false, injects = Feign.class, library = true)
public static class Defaults {
@Provides Contract contract() {
return new Contract.DefaultContract();
}
@Provides SSLSocketFactory sslSocketFactory() {
return SSLSocketFactory.class.cast(SSLSocketFactory.getDefault());
}
@Provides Client httpClient(Client.Default client) {
return client;
}
@Provides Retryer retryer() {
return new Retryer.Default();
}
@Provides Wire noOp() {
return new NoOpWire();
}
@Provides Map<String, Options> noOptions() {
return Collections.emptyMap();
}
@Provides Map<String, BodyEncoder> noBodyEncoders() {
return Collections.emptyMap();
}
@Provides Map<String, FormEncoder> noFormEncoders() {
return Collections.emptyMap();
}
@Provides Map<String, Decoder> noDecoders() {
return Collections.emptyMap();
}
@Provides Map<String, ErrorDecoder> noErrorDecoders() {
return Collections.emptyMap();
}
}
/**
* <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 (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>(3);
modulesForGraph.add(new Defaults());
modulesForGraph.add(new ReflectiveFeign.Module());
if (modules != null)
for (Object module : modules)
modulesForGraph.add(module);
return modulesForGraph;
}
Feign() {
}
}