rpuch commented on a change in pull request #530: URL: https://github.com/apache/ignite-3/pull/530#discussion_r781075626
########## File path: modules/network/src/main/java/org/apache/ignite/internal/network/serialization/FieldAccessorImpl.java ########## @@ -0,0 +1,83 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to You 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 org.apache.ignite.internal.network.serialization; + +import java.lang.invoke.MethodHandles; +import java.lang.invoke.VarHandle; +import java.lang.reflect.Field; +import java.lang.reflect.Modifier; + +/** + * {@link FieldAccessor} implementation. + */ +class FieldAccessorImpl implements FieldAccessor { + private final Field field; + private final VarHandle varHandle; + + FieldAccessorImpl(FieldDescriptor descriptor) { + field = findField(descriptor); + field.setAccessible(true); + + varHandle = varHandleFrom(field); + } + + private static Field findField(FieldDescriptor fieldDescriptor) { + try { + return fieldDescriptor.declaringClass().getDeclaredField(fieldDescriptor.name()); + } catch (NoSuchFieldException e) { + throw new ReflectionException("Cannot find field", e); + } + } + + private static VarHandle varHandleFrom(Field field) { + try { + MethodHandles.Lookup lookup = MethodHandles.privateLookupIn(field.getDeclaringClass(), MethodHandles.lookup()); + return lookup.unreflectVarHandle(field); + } catch (ReflectiveOperationException e) { + throw new ReflectionException("Cannot get a field VarHandle", e); + } + } + + /** {@inheritDoc} */ + @Override + public Object get(Object target) { + return varHandle.get(target); + } + + /** {@inheritDoc} */ + @Override + public void set(Object target, Object fieldValue) { + if (isFieldFinal()) { Review comment: This computation is super-fast, caching this value does not seem to bring any benefit -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
