QueryTimeManager (IoTDB Server 1.0.1 API)

java.lang.Object
- org.apache.iotdb.db.query.control.QueryTimeManager

所有已实现的接口:

org.apache.iotdb.commons.service.IService
```
public class QueryTimeManager
extends java.lang.Object
implements org.apache.iotdb.commons.service.IService
```
This class is used to monitor the executing time of each query. Once one is over the threshold, it will be killed and return the time out exception.

方法概要

所有方法静态方法实例方法具体方法
修饰符和类型	方法	说明
`static boolean`	`checkQueryAlive(long queryId)`	Check given query is alive or not.
`void`	`clear()`
`org.apache.iotdb.commons.service.ServiceType`	`getID()`
`static QueryTimeManager`	`getInstance()`
`QueryContext`	`getQueryContext(long queryId)`
`java.util.Map<java.lang.Long,QueryContext>`	`getQueryContextMap()`
`void`	`killQuery(long queryId)`
`void`	`registerQuery(QueryContext context)`
`void`	`start()`
`void`	`stop()`

从类继承的方法 java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

从接口继承的方法 org.apache.iotdb.commons.service.IService
shutdown, waitAndStop

- 方法详细资料
  - registerQuery
```
public void registerQuery(QueryContext context)
```
  - killQuery
```
public void killQuery(long queryId)
```
  - checkQueryAlive
```
public static boolean checkQueryAlive(long queryId)
```
    Check given query is alive or not. We only throw the queryTimeoutRunTimeException once. If the runTimeException is thrown in main thread, it will quit directly while the return value will be used to ask sub query threads to quit. Else if it's thrown in one sub thread, other sub threads will quit by reading the return value, and main thread will catch and throw the same exception by reading the ExceptionBatchData.
    
    返回:
    
    True if alive.
  - getQueryContextMap
```
public java.util.Map<java.lang.Long,QueryContext> getQueryContextMap()
```
  - clear
```
public void clear()
```
  - getQueryContext
```
public QueryContext getQueryContext(long queryId)
```
  - getInstance
```
public static QueryTimeManager getInstance()
```
  - start
```
public void start()
```
    指定者:
    
    start 在接口中 org.apache.iotdb.commons.service.IService
  - stop
```
public void stop()
```
    指定者:
    
    stop 在接口中 org.apache.iotdb.commons.service.IService
  - getID
```
public org.apache.iotdb.commons.service.ServiceType getID()
```
    指定者:
    
    getID 在接口中 org.apache.iotdb.commons.service.IService