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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.collections;
import com.yahoo.concurrent.CopyOnWriteHashMap;
import java.lang.reflect.Method;
/**
* This will cache methods solved by reflection as reflection is expensive.
* Note that if the bundle from which the method is removed/changed you might have
* a problem... A ClassCastException might be one indication. Then clearing the cache and retrying it
* once to see if it goes away might be a solution.
* @author baldersheim
*/
public final class MethodCache {
private final String methodName;
private final CopyOnWriteHashMap<String, Method> cache = new CopyOnWriteHashMap<>();
public MethodCache(String methodName) {
this.methodName = methodName;
}
/*
Clear all cached methods. Might be a wise thing to do, if you have cached some methods
that have changed due to new bundles being reloaded.
*/
public void clear() {
cache.clear();
}
public Method get(Object object) {
Method m = cache.get(object.getClass().getName());
if (m == null) {
m = lookupMethod(object);
if (m != null) {
cache.put(object.getClass().getName(), m);
}
}
return m;
}
private Method lookupMethod(Object object) {
try {
return object.getClass().getMethod(methodName);
} catch (NoSuchMethodException e) {
return null;
}
}
}
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