CloseWatcher

java.lang.Object
- java.lang.ref.Reference<T>
- - java.lang.ref.PhantomReference<java.lang.Object>
  - - org.h2.util.CloseWatcher

public class CloseWatcher
extends java.lang.ref.PhantomReference<java.lang.Object>

A phantom reference to watch for unclosed objects.

Constructor Summary

Constructors
Constructor	Description
`CloseWatcher(java.lang.Object referent, java.lang.ref.ReferenceQueue<java.lang.Object> q, java.lang.AutoCloseable closeable)`

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`java.lang.AutoCloseable`	`getCloseable()`
`java.lang.String`	`getOpenStackTrace()`	Get the open stack trace or null if none.
`static CloseWatcher`	`pollUnclosed()`	Check for a collected object.
`static CloseWatcher`	`register(java.lang.Object o, java.lang.AutoCloseable closeable, boolean stackTrace)`	Register an object.
`static void`	`unregister(CloseWatcher w)`	Unregister an object, so it is no longer tracked.

Methods inherited from class java.lang.ref.PhantomReference
get

Methods inherited from class java.lang.ref.Reference
clear, clone, enqueue, isEnqueued, reachabilityFence

Methods inherited from class java.lang.Object
equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - CloseWatcher
```
public CloseWatcher(java.lang.Object referent,
                    java.lang.ref.ReferenceQueue<java.lang.Object> q,
                    java.lang.AutoCloseable closeable)
```
- Method Detail
  - pollUnclosed
```
public static CloseWatcher pollUnclosed()
```
    Check for a collected object.
    
    Returns:
    
    the first watcher
  - register
```
public static CloseWatcher register(java.lang.Object o,
                                    java.lang.AutoCloseable closeable,
                                    boolean stackTrace)
```
    Register an object. Before calling this method, pollUnclosed() should be called in a loop to remove old references.
    
    Parameters:
    
    o - the object
    
    closeable - the object to close
    
    stackTrace - whether the stack trace should be registered (this is relatively slow)
    
    Returns:
    
    the close watcher
  - unregister
```
public static void unregister(CloseWatcher w)
```
    Unregister an object, so it is no longer tracked.
    
    Parameters:
    
    w - the reference
  - getOpenStackTrace
```
public java.lang.String getOpenStackTrace()
```
    Get the open stack trace or null if none.
    
    Returns:
    
    the open stack trace
  - getCloseable
```
public java.lang.AutoCloseable getCloseable()
```