Package org.apache.lucene.store

# Class Lock

java.lang.Object
org.apache.lucene.store.Lock

All Implemented Interfaces:
  `Closeable`, `AutoCloseable`

public abstract class Lock extends Object implements Closeable
An interprocess mutex lock.

Typical use might look like:

       try (final Lock lock = directory.obtainLock("my.lock")) {
         // ... code to execute while locked ...
       }

See Also:
  - `Directory.obtainLock(String)`
NOTE: This API is for internal purposes only and might change in incompatible ways in the next release.

- ## Constructor Summary

  Constructors
  Constructor
  Description
  `Lock()`

- ## Method Summary

  Modifier and Type
  Method
  Description
  `abstract void`
  `close()`
  Releases exclusive access.
  `abstract void`
  `ensureValid()`
  Best effort check that this lock is still valid.

  ### Methods inherited from class java.lang.Object

  `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- ## Constructor Details

  - ### Lock

    public Lock()

- ## Method Details

  - ### close

    public abstract void close() throws IOException
    Releases exclusive access.

    Note that exceptions thrown from close may require human intervention, as it may mean the lock was no longer valid, or that fs permissions prevent removal of the lock file, or other reasons.

    Specified by:
      `close` in interface `AutoCloseable`
    Specified by:
      `close` in interface `Closeable`
    Throws:
      `LockReleaseFailedException` - optional specific exception) if the lock could not be properly released.
      `IOException`

  - ### ensureValid

    public abstract void ensureValid() throws IOException
    Best effort check that this lock is still valid. Locks could become invalidated externally for a number of reasons, for example if a user deletes the lock file manually or when a network filesystem is in use.
    Throws:
      `IOException` - if the lock is no longer valid.