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Capability.java
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115 lines (98 loc) · 3.43 KB
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/**
* Copyright 2012-2020 The Feign Authors
*
* 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.InvocationTargetException;
import java.util.Arrays;
import java.util.List;
import feign.Logger.Level;
import feign.Request.Options;
import feign.codec.Decoder;
import feign.codec.Encoder;
/**
* Capabilities expose core feign artifacts to implementations so parts of core can be customized
* around the time the client being built.
*
* For instance, capabilities take the {@link Client}, make changes to it and feed the modified
* version back to feign.
*
* @see Metrics5Capability
*/
public interface Capability {
static <E> E enrich(E componentToEnrich, List<Capability> capabilities) {
return capabilities.stream()
// invoke each individual capability and feed the result to the next one.
// This is equivalent to:
// Capability cap1 = ...;
// Capability cap2 = ...;
// Capability cap2 = ...;
// Contract contract = ...;
// Contract contract1 = cap1.enrich(contract);
// Contract contract2 = cap2.enrich(contract1);
// Contract contract3 = cap3.enrich(contract2);
// or in a more compact version
// Contract enrichedContract = cap3.enrich(cap2.enrich(cap1.enrich(contract)));
.reduce(
componentToEnrich,
(component, capability) -> invoke(component, capability),
(component, enrichedComponent) -> enrichedComponent);
}
static <E> E invoke(E target, Capability capability) {
return Arrays.stream(capability.getClass().getMethods())
.filter(method -> method.getName().equals("enrich"))
.filter(method -> method.getReturnType().isInstance(target))
.findFirst()
.map(method -> {
try {
return (E) method.invoke(capability, target);
} catch (IllegalAccessException | IllegalArgumentException
| InvocationTargetException e) {
throw new RuntimeException("Unable to enrich " + target, e);
}
})
.orElse(target);
}
default Client enrich(Client client) {
return client;
}
default Retryer enrich(Retryer retryer) {
return retryer;
}
default RequestInterceptor enrich(RequestInterceptor requestInterceptor) {
return requestInterceptor;
}
default Logger enrich(Logger logger) {
return logger;
}
default Level enrich(Level level) {
return level;
}
default Contract enrich(Contract contract) {
return contract;
}
default Options enrich(Options options) {
return options;
}
default Encoder enrich(Encoder encoder) {
return encoder;
}
default Decoder enrich(Decoder decoder) {
return decoder;
}
default InvocationHandlerFactory enrich(InvocationHandlerFactory invocationHandlerFactory) {
return invocationHandlerFactory;
}
default QueryMapEncoder enrich(QueryMapEncoder queryMapEncoder) {
return queryMapEncoder;
}
}