1 | // Copyright 2012 Georg-August-Universität Göttingen, Germany |
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2 | // |
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3 | // Licensed under the Apache License, Version 2.0 (the "License"); |
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4 | // you may not use this file except in compliance with the License. |
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5 | // You may obtain a copy of the License at |
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6 | // |
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7 | // http://www.apache.org/licenses/LICENSE-2.0 |
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8 | // |
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9 | // Unless required by applicable law or agreed to in writing, software |
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10 | // distributed under the License is distributed on an "AS IS" BASIS, |
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11 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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12 | // See the License for the specific language governing permissions and |
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13 | // limitations under the License. |
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14 | |
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15 | package de.ugoe.cs.autoquest.httpmonitor; |
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16 | |
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17 | /** |
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18 | * <p> |
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19 | * This is a simple id generator that uses the timestamps as id. If {@link #getNextId()} is called |
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20 | * twice in the same millisecond, than just the next millisecond is used. |
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21 | * </p> |
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22 | * |
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23 | * @author Patrick Harms |
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24 | */ |
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25 | public class SimpleIdGenerator implements IdGenerator { |
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26 | |
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27 | /** */ |
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28 | private long lastId; |
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29 | |
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30 | /* (non-Javadoc) |
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31 | * @see de.ugoe.cs.autoquest.httpmonitor.HttpMonitorComponent#init() |
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32 | */ |
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33 | @Override |
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34 | public void init() throws IllegalStateException, HttpMonitorException { |
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35 | lastId = System.currentTimeMillis(); |
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36 | } |
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37 | |
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38 | /* (non-Javadoc) |
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39 | * @see de.ugoe.cs.autoquest.httpmonitor.HttpMonitorComponent#start() |
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40 | */ |
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41 | @Override |
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42 | public void start() throws IllegalStateException, HttpMonitorException { |
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43 | // nothing to do |
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44 | } |
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45 | |
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46 | /* (non-Javadoc) |
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47 | * @see de.ugoe.cs.autoquest.httpmonitor.HttpMonitorComponent#stop() |
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48 | */ |
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49 | @Override |
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50 | public void stop() { |
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51 | // nothing to do |
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52 | } |
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53 | |
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54 | /* (non-Javadoc) |
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55 | * @see de.ugoe.cs.autoquest.httpmonitor.IdGenerator#getNextId() |
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56 | */ |
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57 | @Override |
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58 | public synchronized long getNextId() { |
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59 | long newId = System.currentTimeMillis(); |
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60 | |
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61 | if (newId <= lastId) { |
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62 | newId = lastId + 1; |
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63 | } |
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64 | |
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65 | lastId = newId; |
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66 | |
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67 | return newId; |
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68 | } |
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69 | |
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70 | } |
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