org.apache.lucene.store

## Class SingleInstanceLockFactory

- java.lang.Object
- - org.apache.lucene.store.LockFactory
  - - org.apache.lucene.store.SingleInstanceLockFactory

-     public final class SingleInstanceLockFactory
      extends LockFactory

  Implements `LockFactory` for a single in-process instance, meaning all locking will take place through this one instance. Only use this `LockFactory` when you are certain all IndexWriters for a given index are running against a single shared in-process Directory instance. This is currently the default locking for RAMDirectory.
  See Also:
    `LockFactory`

- - ### Constructor Summary

    Constructors
    Constructor and Description
    `SingleInstanceLockFactory()`

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `Lock` | `obtainLock(Directory dir, String lockName)` Return a new obtained Lock instance identified by lockName.

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

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

- - ### Constructor Detail

    - #### SingleInstanceLockFactory

          public SingleInstanceLockFactory()

  - ### Method Detail

    - #### obtainLock

          public Lock obtainLock(Directory dir,
                                 String lockName)
                          throws IOException

      Description copied from class: `LockFactory`
      Return a new obtained Lock instance identified by lockName.
      Specified by:
        `obtainLock` in class `LockFactory`
        `lockName` - name of the lock to be created.
      Throws:
        `LockObtainFailedException` - (optional specific exception) if the lock could not be obtained because it is currently held elsewhere.
        `IOException` - if any i/o error occurs attempting to gain the lock

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