dubbo ClearTelnetHandler 源码
dubbo ClearTelnetHandler 代码
文件路径：/dubbo-remoting/dubbo-remoting-api/src/main/java/org/apache/dubbo/remoting/telnet/support/command/ClearTelnetHandler.java
/*
* 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.dubbo.remoting.telnet.support.command;
import org.apache.dubbo.common.extension.Activate;
import org.apache.dubbo.common.utils.StringUtils;
import org.apache.dubbo.remoting.Channel;
import org.apache.dubbo.remoting.telnet.TelnetHandler;
import org.apache.dubbo.remoting.telnet.support.Help;
/**
* ClearTelnetHandler
*/
@Activate
@Help(parameter = "[lines]", summary = "Clear screen.", detail = "Clear screen.")
public class ClearTelnetHandler implements TelnetHandler {
private static final int MAX_LINES = 1000;
@Override
public String telnet(Channel channel, String message) {
int lines = 100;
if (message.length() > 0) {
if (!StringUtils.isNumber(message)) {
return "Illegal lines " + message + ", must be integer.";
}
lines = Math.min(MAX_LINES,Integer.parseInt(message));
}
StringBuilder buf = new StringBuilder();
for (int i = 0; i < lines; i++) {
buf.append("\r\n");
}
return buf.toString();
}
}
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