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ResponseInterceptor.java
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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;
/**
* {@code ResponseInterceptor}s may be configured for purposes such as verifying or modifying
* headers of response, verifying the business status of decoded object, or processing responses to
* unsuccessful requests. Once the interceptors are applied, {@link
* ResponseInterceptor#intercept(InvocationContext, Chain)} is called, then the response is decoded.
*/
public interface ResponseInterceptor {
/**
* Called by {@link ResponseHandler} after refreshing the response and wrapped around the whole
* decode process, must either manually invoke {@link Chain#next(InvocationContext)} or manually
* create a new response object
*
* @param invocationContext information surrounding the response being decoded
* @return decoded response
*/
Object intercept(InvocationContext invocationContext, Chain chain) throws Exception;
/**
* Return a new {@link ResponseInterceptor} that invokes the current interceptor first and then
* the one that is passed in.
*
* @param nextInterceptor the interceptor to delegate to after the current
* @return a new interceptor that chains the two
*/
default ResponseInterceptor andThen(ResponseInterceptor nextInterceptor) {
return (ic, chain) ->
intercept(ic, nextContext -> nextInterceptor.intercept(nextContext, chain));
}
/** Contract for delegation to the rest of the chain. */
interface Chain {
Chain DEFAULT = InvocationContext::proceed;
/**
* Delegate to the rest of the chain to execute the request.
*
* @param context the request to execute the {@link Chain} .
* @return the response
*/
Object next(InvocationContext context) throws Exception;
}
/**
* Apply this interceptor to the given {@code Chain} resulting in an intercepted chain.
*
* @param chain the chain to add interception around
* @return a new chain instance
*/
default Chain apply(Chain chain) {
return request -> intercept(request, chain);
}
}