scala.runtime.StructuralCallSite Maven / Gradle / Ivy
/*
* Scala (https://www.scala-lang.org)
*
* Copyright EPFL and Lightbend, Inc.
*
* Licensed under Apache License 2.0
* (http://www.apache.org/licenses/LICENSE-2.0).
*
* See the NOTICE file distributed with this work for
* additional information regarding copyright ownership.
*/
package scala.runtime;
import java.lang.invoke.*;
import java.lang.ref.SoftReference;
import java.lang.reflect.Method;
public final class StructuralCallSite {
private Class[] parameterTypes;
private SoftReference cache = new SoftReference<>(new EmptyMethodCache());
private StructuralCallSite(MethodType callType) {
parameterTypes = callType.parameterArray();
}
public MethodCache get() {
MethodCache cache = this.cache.get();
if (cache == null) {
cache = new EmptyMethodCache();
this.cache = new SoftReference<>(cache);
}
return cache;
}
public Method find(Class receiver) {
return get().find(receiver);
}
public Method add(Class receiver, Method m) {
cache = new SoftReference(get().add(receiver, m));
return m;
}
public Class[] parameterTypes() {
return parameterTypes;
}
public static CallSite bootstrap(MethodHandles.Lookup lookup, String invokedName,
MethodType invokedType, MethodType reflectiveCallType) throws Throwable {
StructuralCallSite structuralCallSite = new StructuralCallSite(reflectiveCallType);
return new ConstantCallSite(MethodHandles.constant(StructuralCallSite.class, structuralCallSite));
}
}