c424599593
Motivation: We should access the Constructor of the passed in class in the Constructor of ReflectiveChannelFactory only to reduce the overhead but also fail-fast. Modifications: Access the Constructor early. Result: Fails fast and less performance overhead.
56 lines
1.9 KiB
Java
56 lines
1.9 KiB
Java
/*
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* Copyright 2014 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
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* version 2.0 (the "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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package io.netty.channel;
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import io.netty.util.internal.ObjectUtil;
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import io.netty.util.internal.StringUtil;
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import java.lang.reflect.Constructor;
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/**
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* A {@link ChannelFactory} that instantiates a new {@link Channel} by invoking its default constructor reflectively.
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*/
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public class ReflectiveChannelFactory<T extends Channel> implements ChannelFactory<T> {
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private final Constructor<? extends T> constructor;
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public ReflectiveChannelFactory(Class<? extends T> clazz) {
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ObjectUtil.checkNotNull(clazz, "clazz");
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try {
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this.constructor = clazz.getConstructor();
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} catch (NoSuchMethodException e) {
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throw new IllegalArgumentException("Class " + StringUtil.simpleClassName(clazz) +
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" does not have a public non-arg constructor", e);
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}
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}
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@Override
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public T newChannel() {
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try {
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return constructor.newInstance();
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} catch (Throwable t) {
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throw new ChannelException("Unable to create Channel from class " + constructor.getDeclaringClass(), t);
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}
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}
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@Override
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public String toString() {
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return StringUtil.simpleClassName(ReflectiveChannelFactory.class) +
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'(' + StringUtil.simpleClassName(constructor.getDeclaringClass()) + ".class)";
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}
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}
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