| /* |
| * ==================================================================== |
| * 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. |
| * ==================================================================== |
| * |
| * This software consists of voluntary contributions made by many |
| * individuals on behalf of the Apache Software Foundation. For more |
| * information on the Apache Software Foundation, please see |
| * <http://www.apache.org/>. |
| * |
| */ |
| package org.apache.hc.client5.http.impl.cache; |
| |
| import java.net.InetAddress; |
| import java.net.UnknownHostException; |
| import java.security.NoSuchAlgorithmException; |
| import java.security.SecureRandom; |
| import java.util.Formatter; |
| import java.util.Locale; |
| |
| /** |
| * Should produce reasonably unique tokens. |
| */ |
| class BasicIdGenerator { |
| |
| private final String hostname; |
| private final SecureRandom rnd; |
| |
| private long count; |
| |
| public BasicIdGenerator() { |
| super(); |
| String hostname; |
| try { |
| hostname = InetAddress.getLocalHost().getHostName(); |
| } catch (final UnknownHostException ex) { |
| hostname = "localhost"; |
| } |
| this.hostname = hostname; |
| try { |
| this.rnd = SecureRandom.getInstance("SHA1PRNG"); |
| } catch (final NoSuchAlgorithmException ex) { |
| throw new Error(ex); |
| } |
| this.rnd.setSeed(System.currentTimeMillis()); |
| } |
| |
| public synchronized void generate(final StringBuilder buffer) { |
| this.count++; |
| final int rndnum = this.rnd.nextInt(); |
| buffer.append(System.currentTimeMillis()); |
| buffer.append('.'); |
| final Formatter formatter = new Formatter(buffer, Locale.ROOT); |
| formatter.format("%1$016x-%2$08x", Long.valueOf(this.count), Integer.valueOf(rndnum)); |
| formatter.close(); |
| buffer.append('.'); |
| buffer.append(this.hostname); |
| } |
| |
| public String generate() { |
| final StringBuilder buffer = new StringBuilder(); |
| generate(buffer); |
| return buffer.toString(); |
| } |
| |
| } |