io.dapr.actors.runtime.ActorMethodInfoMap Maven / Gradle / Ivy
/*
* Copyright 2021 The Dapr 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 io.dapr.actors.runtime;
import io.dapr.actors.ActorMethod;
import java.lang.reflect.Method;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
/**
* Actor method dispatcher map. Holds method_name -> Method for methods defined in Actor interfaces.
*/
class ActorMethodInfoMap {
/**
* Map for methods based on name.
*/
private final Map methods;
/**
* Instantiates a given Actor map based on the interfaces found in the class.
*
* @param interfaceTypes Interfaces found in the Actor class.
*/
ActorMethodInfoMap(Collection> interfaceTypes) {
Map methods = new HashMap<>();
// Find methods which are defined in Actor interface.
for (Class actorInterface : interfaceTypes) {
for (Method methodInfo : actorInterface.getMethods()) {
// Only support methods with 1 or 0 argument.
if (methodInfo.getParameterCount() <= 1) {
// If Actor class uses overloading, then one will win.
// Document this behavior, so users know how to write their code.
String methodName = methodInfo.getName();
ActorMethod actorMethodAnnotation = methodInfo.getAnnotation(ActorMethod.class);
if ((actorMethodAnnotation != null) && !actorMethodAnnotation.name().isEmpty()) {
methodName = actorMethodAnnotation.name();
}
methods.put(methodName, methodInfo);
}
}
}
this.methods = Collections.unmodifiableMap(methods);
}
/**
* Gets the Actor's method by name.
*
* @param methodName Name of the method.
* @return Method.
* @throws NoSuchMethodException If method is not found.
*/
Method get(String methodName) throws NoSuchMethodException {
Method method = this.methods.get(methodName);
if (method == null) {
throw new NoSuchMethodException(String.format("Could not find method %s.", methodName));
}
return method;
}
}