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# Spring StopWatch
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- Author: [HuiFer](https://github.com/huifer)
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- Դ<><D4B4><EFBFBD>Ķ<EFBFBD><C4B6>ֿ<EFBFBD>: [SourceHot-spring](https://github.com/SourceHot/spring-framework-read)
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- ȫ·<C8AB><C2B7>: `org.springframework.util.StopWatch`
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## <20><><EFBFBD><EFBFBD>
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- taskList: <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϣ<EFBFBD>б<EFBFBD>
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- keepTaskList: <20>Ƿ<EFBFBD><C7B7><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϣ<EFBFBD>б<EFBFBD>
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- startTimeMillis: <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʼ<EFBFBD><CABC>ʱ<EFBFBD><CAB1>
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- currentTaskName: <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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- lastTaskInfo: <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϣ
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- taskCount: <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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- totalTimeMillis: <20>ܹ<EFBFBD><DCB9><EFBFBD><EFBFBD>ѵ<EFBFBD>ʱ<EFBFBD><CAB1>
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## <20><><EFBFBD><EFBFBD>
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- `org.springframework.util.StopWatch.start(java.lang.String)`
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```java
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public void start(String taskName) throws IllegalStateException {
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if (this.currentTaskName != null) {
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throw new IllegalStateException("Can't start StopWatch: it's already running");
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}
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this.currentTaskName = taskName;
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this.startTimeMillis = System.currentTimeMillis();
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}
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```
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- `org.springframework.util.StopWatch.stop`
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```java
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public void stop() throws IllegalStateException {
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if (this.currentTaskName == null) {
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throw new IllegalStateException("Can't stop StopWatch: it's not running");
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}
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// <20><><EFBFBD>ѵ<EFBFBD>ʱ<EFBFBD><CAB1>
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long lastTime = System.currentTimeMillis() - this.startTimeMillis;
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this.totalTimeMillis += lastTime;
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// <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϣ<EFBFBD><CFA2>ʼ<EFBFBD><CABC>
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this.lastTaskInfo = new TaskInfo(this.currentTaskName, lastTime);
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if (this.keepTaskList) {
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this.taskList.add(this.lastTaskInfo);
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}
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++this.taskCount;
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this.currentTaskName = null;
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}
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```
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