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111 lines (101 loc) · 3.24 KB
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/**
* Copyright 2012-2019 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.reactive;
import feign.FeignException;
import feign.InvocationHandlerFactory.MethodHandler;
import feign.Target;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.lang.reflect.Type;
import java.util.Map;
import java.util.concurrent.Callable;
import org.reactivestreams.Publisher;
public abstract class ReactiveInvocationHandler implements InvocationHandler {
private final Target<?> target;
private final Map<Method, MethodHandler> dispatch;
public ReactiveInvocationHandler(Target<?> target,
Map<Method, MethodHandler> dispatch) {
this.target = target;
this.dispatch = dispatch;
}
@Override
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
if ("equals".equals(method.getName())) {
try {
Object otherHandler =
args.length > 0 && args[0] != null ? Proxy.getInvocationHandler(args[0]) : null;
return equals(otherHandler);
} catch (IllegalArgumentException e) {
return false;
}
} else if ("hashCode".equals(method.getName())) {
return hashCode();
} else if ("toString".equals(method.getName())) {
return toString();
}
return this.invoke(method, this.dispatch.get(method), args);
}
@Override
public int hashCode() {
return this.target.hashCode();
}
@Override
public boolean equals(Object obj) {
if (obj == null) {
return false;
}
if (obj == this) {
return true;
}
if (ReactiveInvocationHandler.class.isAssignableFrom(obj.getClass())) {
return this.target.equals(obj);
}
return false;
}
@Override
public String toString() {
return "Target [" + this.target.toString() + "]";
}
/**
* Invoke the Method Handler.
*
* @param method on the Target to invoke.
* @param methodHandler to invoke
* @param arguments for the method
* @return a reactive {@link Publisher} for the invocation.
*/
protected abstract Publisher invoke(Method method,
MethodHandler methodHandler,
Object[] arguments);
/**
* Invoke the Method Handler as a Callable.
*
* @param methodHandler to invoke
* @param arguments for the method
* @return a Callable wrapper for the invocation.
*/
Callable<?> invokeMethod(MethodHandler methodHandler, Object[] arguments) {
return () -> {
try {
return methodHandler.invoke(arguments);
} catch (Throwable th) {
if (th instanceof FeignException) {
throw (FeignException) th;
}
throw new RuntimeException(th);
}
};
}
}