java.lang.Object
- org.apache.ignite.internal.processors.cache.persistence.checkpoint.CheckpointReadWriteLock

```
public class CheckpointReadWriteLock
extends Object
```
Wrapper of the classic read write lock with checkpoint features.

Field Summary

Fields
Modifier and Type Field Description

static ThreadLocal<Integer> CHECKPOINT_LOCK_HOLD_COUNT
Checkpoint lock hold count.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`boolean`	`checkpointLockIsHeldByThread()`	This method works only if the assertion is enabled or it always returns true otherwise.
`int`	`getReadHoldCount()`
`boolean`	`isWriteLockHeldByCurrentThread()`
`void`	`readLock()`	Gets the checkpoint read lock.
`void`	`readUnlock()`	Releases the checkpoint read lock.
`boolean`	`tryReadLock(long timeout, TimeUnit unit)`	Gets the checkpoint read lock.
`void`	`writeLock()`	Take the checkpoint write lock.
`void`	`writeUnlock()`	Release the checkpoint write lock

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

- Field Detail
  - CHECKPOINT_LOCK_HOLD_COUNT
```
public static final ThreadLocal<Integer> CHECKPOINT_LOCK_HOLD_COUNT
```
    Checkpoint lock hold count.
- Method Detail
  - readLock
```
public void readLock()
```
    Gets the checkpoint read lock. While this lock is held, checkpoint thread will not acquireSnapshotWorker memory state.
    
    Throws:
    
    IgniteException - If failed.
  - tryReadLock
```
public boolean tryReadLock(long timeout,
                           TimeUnit unit)
                    throws InterruptedException
```
    Gets the checkpoint read lock. While this lock is held, checkpoint thread will not acquireSnapshotWorker memory state.
    
    Throws:
    
    IgniteException - If failed.
    
    InterruptedException
  - checkpointLockIsHeldByThread
```
public boolean checkpointLockIsHeldByThread()
```
    This method works only if the assertion is enabled or it always returns true otherwise.
    
    Returns:
    
    true if checkpoint lock is held by current thread.
  - readUnlock
```
public void readUnlock()
```
    Releases the checkpoint read lock.
  - writeLock
```
public void writeLock()
```
    Take the checkpoint write lock.
  - isWriteLockHeldByCurrentThread
```
public boolean isWriteLockHeldByCurrentThread()
```
    Returns:
    
    true if current thread hold the write lock.
  - writeUnlock
```
public void writeUnlock()
```
    Release the checkpoint write lock
  - getReadHoldCount
```
public int getReadHoldCount()
```

Class CheckpointReadWriteLock

Field Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

CHECKPOINT_LOCK_HOLD_COUNT

Method Detail

readLock

tryReadLock

checkpointLockIsHeldByThread

readUnlock

writeLock

isWriteLockHeldByCurrentThread

writeUnlock

getReadHoldCount