/*
* (C) 2007-2012 Alibaba Group Holding Limited.
*
* 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.
* Authors:
* wuhua <wq163@163.com> , boyan <killme2008@gmail.com>
*/
package com.taobao.metamorphosis.utils;
import java.util.concurrent.atomic.AtomicLong;
import com.taobao.metamorphosis.network.RemotingUtils;
/**
* Generator for Globally unique Strings.
*
* @author boyan
*/
public class IdGenerator {
private String seed;
private final AtomicLong sequence = new AtomicLong(1);
private int length;
/**
* Construct an IdGenerator
*/
public IdGenerator() {
try {
this.seed = RemotingUtils.getLocalHost() + "-" + System.currentTimeMillis() + "-";
this.length = this.seed.length() + ("" + Long.MAX_VALUE).length();
}
catch (final Exception e) {
throw new RuntimeException(e);
}
}
/**
* Generate a unqiue id
*
* @return a unique id
*/
public synchronized String generateId() {
final StringBuilder sb = new StringBuilder(this.length);
sb.append(this.seed);
sb.append(this.sequence.getAndIncrement());
return sb.toString();
}
/**
* Generate a unique ID - that is friendly for a URL or file system
*
* @return a unique id
*/
public String generateSanitizedId() {
String result = this.generateId();
result = result.replace(':', '-');
result = result.replace('_', '-');
result = result.replace('.', '-');
return result;
}
}