com.hazelcast.internal.nio.InstanceCreationUtil Maven / Gradle / Ivy
/*
* Copyright (c) 2008-2021, Hazelcast, Inc. All Rights Reserved.
*
* 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 com.hazelcast.internal.nio;
import com.hazelcast.org.objenesis.Objenesis;
import com.hazelcast.org.objenesis.ObjenesisStd;
import com.hazelcast.org.objenesis.instantiator.ObjectInstantiator;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.function.Supplier;
import static com.hazelcast.internal.util.ExceptionUtil.rethrow;
/**
* Utility class to deal with creation of new object instances.
*/
public final class InstanceCreationUtil {
private static final Objenesis OBJENESIS = new ObjenesisStd(true);
private static final Map, Supplier> OBJECT_SUPPLIERS = new ConcurrentHashMap<>();
private InstanceCreationUtil() {
}
/**
* Creates a new instance of given class, bypassing constructors using Objenesis' instantiators if the default
* constructor does not exists.
* @param klass class which instance will be created
* @param type of class {@code klass}
* @return newly created blank object
*/
@SuppressWarnings({"unchecked", "rawtypes"})
public static T createNewInstance(Class klass) {
Supplier supplier = (Supplier) OBJECT_SUPPLIERS.computeIfAbsent(klass, clz -> {
if (canUseConstructor(clz)) {
return () -> (T) newInstanceUsingConstructor(clz);
} else {
ObjectInstantiator instantiator = OBJENESIS.getInstantiatorOf(klass);
return () -> (T) instantiator.newInstance();
}
});
return supplier.get();
}
private static boolean canUseConstructor(Class clz) {
try {
ClassLoaderUtil.newInstance(clz.getClassLoader(), clz);
return true;
} catch (Exception e) {
return false;
}
}
private static T newInstanceUsingConstructor(Class clz) {
try {
return ClassLoaderUtil.newInstance(clz.getClassLoader(), clz);
} catch (Exception e) {
throw rethrow(e);
}
}
}