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Resilience4jFeign.java
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Resilience4jFeign.java
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/*
*
* Copyright 2018
*
* 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 io.github.resilience4j.feign;
import feign.Feign;
import feign.InvocationHandlerFactory;
/**
* Main class for combining feign with Resilience4j.
*
* <pre>
* {@code
* MyService myService = Resilience4jFeign.builder(decorators).target(MyService.class, "http://localhost:8080/");
* }
* </pre>
*
* {@link Resilience4jFeign} works in the same way as the standard {@link Feign.Builder}. Only
* {@link Feign.Builder#invocationHandlerFactory(InvocationHandlerFactory)} may not be called as
* this is how {@link Resilience4jFeign} decorates the feign interface. <br>
* See {@link FeignDecorators} on how to build decorators and enhance your feign interfaces.
*/
public final class Resilience4jFeign {
public static Builder builder(FeignDecorator invocationDecorator) {
return new Builder(invocationDecorator);
}
public static final class Builder extends Feign.Builder {
private final FeignDecorator invocationDecorator;
public Builder(FeignDecorator invocationDecorator) {
this.invocationDecorator = invocationDecorator;
}
/**
* Will throw an {@link UnsupportedOperationException} exception.
*/
@Override
public Feign.Builder invocationHandlerFactory(InvocationHandlerFactory invocationHandlerFactory) {
throw new UnsupportedOperationException();
}
@Override
public Feign build() {
super.invocationHandlerFactory(
(target, dispatch) -> new DecoratorInvocationHandler(target, dispatch, invocationDecorator));
return super.build();
}
}
}