net.dreamlu.mica.redis.pubsub.ChannelUtil Maven / Gradle / Ivy
Show all versions of mica-redis Show documentation
/*
* Copyright (c) 2019-2029, Dreamlu 卢春梦 ([email protected] & www.dreamlu.net).
*
* Licensed under the GNU LESSER GENERAL PUBLIC LICENSE 3.0;
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.gnu.org/licenses/lgpl.html
*
* 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 net.dreamlu.mica.redis.pubsub;
import lombok.experimental.UtilityClass;
import net.dreamlu.mica.core.utils.CharPool;
import org.springframework.data.redis.listener.ChannelTopic;
import org.springframework.data.redis.listener.PatternTopic;
import org.springframework.data.redis.listener.Topic;
/**
* channel 工具类
*
* @author L.cm
*/
@UtilityClass
class ChannelUtil {
/**
* 获取 pub sub topic
*
* @param channel channel
* @return Topic
*/
public static Topic getTopic(String channel) {
return isPattern(channel) ? new PatternTopic(channel) : new ChannelTopic(channel);
}
/**
* 判断是否为模糊话题，*、? 和 [...]
*
* @param channel 话题名
* @return 是否模糊话题
*/
public static boolean isPattern(String channel) {
int length = channel.length();
boolean isRightSqBracket = false;
// 倒序，因为表达式一般在尾部
for (int i = length - 1; i > 0; i--) {
char charAt = channel.charAt(i);
switch (charAt) {
case CharPool.ASTERISK:
case CharPool.QUESTION_MARK:
if (isEscapeChars(channel, i)) {
break;
}
return true;
case CharPool.RIGHT_SQ_BRACKET:
if (isEscapeChars(channel, i)) {
break;
}
isRightSqBracket = true;
break;
case CharPool.LEFT_SQ_BRACKET:
if (isEscapeChars(channel, i)) {
break;
}
if (isRightSqBracket) {
return true;
}
break;
default:
break;
}
}
return false;
}
/**
* 判断是否为转义字符
*
* @param name 话题名
* @param index 索引
* @return 是否为转义字符
*/
private static boolean isEscapeChars(String name, int index) {
if (index < 1) {
return false;
}
// 预读一位，判断是否为转义符 “/”
char charAt = name.charAt(index - 1);
return CharPool.BACK_SLASH == charAt;
}
}