## Package org.apache.lucene.store

Binary i/o API, used for all index data.

See:
Description

Class Summary
BufferedIndexInput: Base implementation class for buffered `IndexInput`.
BufferedIndexOutput: Base implementation class for buffered `IndexOutput`.
ChecksumIndexInput: Writes bytes through to a primary IndexOutput, computing checksum as it goes.
ChecksumIndexOutput: Writes bytes through to a primary IndexOutput, computing checksum.
Directory: A Directory is a flat list of files.
FileSwitchDirectory: Expert: A Directory instance that switches files between two other Directory instances.
FSDirectory: Base class for Directory implementations that store index files in the file system.
FSDirectory.FSIndexInput: Deprecated. Use SimpleFSDirectory.SimpleFSIndexInput instead
FSDirectory.FSIndexInput.Descriptor: Deprecated.
FSDirectory.FSIndexOutput: Deprecated. Use SimpleFSDirectory.SimpleFSIndexOutput instead
FSLockFactory: Base class for file system based locking implementation.
IndexInput: Abstract base class for input from a file in a `Directory`.
IndexOutput: Abstract base class for output to a file in a Directory.
Lock: An interprocess mutex lock.
Lock.With: Utility class for executing code with exclusive access.
LockFactory: Base class for Locking implementation.
LockStressTest: Simple standalone tool that forever acquires & releases a lock using a specific LockFactory.
LockVerifyServer: Simple standalone server that must be running when you use `VerifyingLockFactory`.
MMapDirectory: File-based `Directory` implementation that uses mmap for reading, and `SimpleFSDirectory.SimpleFSIndexOutput` for writing.
NativeFSLockFactory: Implements `LockFactory` using native OS file locks.
NIOFSDirectory: An `FSDirectory` implementation that uses java.nio's FileChannel's positional read, which allows multiple threads to read from the same file without synchronizing.
NIOFSDirectory.NIOFSIndexInput
NoLockFactory: Use this `LockFactory` to disable locking entirely.
RAMDirectory: A memory-resident `Directory` implementation.
RAMFile: For Lucene internal use
RAMOutputStream: A memory-resident `IndexOutput` implementation.
SimpleFSDirectory: A straightforward implementation of `FSDirectory` using java.io.RandomAccessFile.
SimpleFSDirectory.SimpleFSIndexInput
SimpleFSDirectory.SimpleFSIndexInput.Descriptor
SimpleFSDirectory.SimpleFSIndexOutput
SimpleFSLockFactory: Implements `LockFactory` using `File.createNewFile()`.
SingleInstanceLockFactory: Implements `LockFactory` for a single in-process instance, meaning all locking will take place through this one instance.
VerifyingLockFactory: A `LockFactory` that wraps another `LockFactory` and verifies that each lock obtain/release is "correct" (never results in two processes holding the lock at the same time).

Exception Summary
AlreadyClosedException: This exception is thrown when there is an attempt to access something that has already been closed.
LockObtainFailedException: This exception is thrown when the `write.lock` could not be acquired.
LockReleaseFailedException: This exception is thrown when the `write.lock` could not be released.
NoSuchDirectoryException: This exception is thrown when you try to list a non-existent directory.

## Package org.apache.lucene.store Description

Binary i/o API, used for all index data.

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