71 lines
2.6 KiB
Java
71 lines
2.6 KiB
Java
|
/*
|
||
|
|
* Copyright 2013 The Netty Project
|
||
|
|
*
|
||
|
|
* The Netty Project 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 io.netty.util;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Collection of method to handle objects that may implement {@link ReferenceCounted}.
|
||
|
|
*/
|
||
|
|
public final class ReferenceCountUtil {
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Try to call {@link ReferenceCounted#retain()} if the specified message implements {@link ReferenceCounted}.
|
||
|
|
* If the specified message doesn't implement {@link ReferenceCounted}, this method does nothing.
|
||
|
|
*/
|
||
|
|
@SuppressWarnings("unchecked")
|
||
|
|
public static <T> T retain(T msg) {
|
||
|
|
if (msg instanceof ReferenceCounted) {
|
||
|
|
return (T) ((ReferenceCounted) msg).retain();
|
||
|
|
}
|
||
|
|
return msg;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Try to call {@link ReferenceCounted#retain()} if the specified message implements {@link ReferenceCounted}.
|
||
|
|
* If the specified message doesn't implement {@link ReferenceCounted}, this method does nothing.
|
||
|
|
*/
|
||
|
|
@SuppressWarnings("unchecked")
|
||
|
|
public static <T> T retain(T msg, int increment) {
|
||
|
|
if (msg instanceof ReferenceCounted) {
|
||
|
|
return (T) ((ReferenceCounted) msg).retain(increment);
|
||
|
|
}
|
||
|
|
return msg;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Try to call {@link ReferenceCounted#release()} if the specified message implements {@link ReferenceCounted}.
|
||
|
|
* If the specified message doesn't implement {@link ReferenceCounted}, this method does nothing.
|
||
|
|
*/
|
||
|
|
public static boolean release(Object msg) {
|
||
|
|
if (msg instanceof ReferenceCounted) {
|
||
|
|
return ((ReferenceCounted) msg).release();
|
||
|
|
}
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Try to call {@link ReferenceCounted#release()} if the specified message implements {@link ReferenceCounted}.
|
||
|
|
* If the specified message doesn't implement {@link ReferenceCounted}, this method does nothing.
|
||
|
|
*/
|
||
|
|
public static boolean release(Object msg, int decrement) {
|
||
|
|
if (msg instanceof ReferenceCounted) {
|
||
|
|
return ((ReferenceCounted) msg).release(decrement);
|
||
|
|
}
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
private ReferenceCountUtil() { }
|
||
|
|
}
|