org.apache.lucene.store
Class MockDirectoryWrapper

java.lang.Object
  org.apache.lucene.store.Directory
      org.apache.lucene.store.MockDirectoryWrapper

All Implemented Interfaces:

Closeable

public class MockDirectoryWrapper
extends Directory

This is a Directory Wrapper that adds methods intended to be used only by unit tests. It also adds a number of features useful for testing:

• Instances created by LuceneTestCase.newDirectory() are tracked to ensure they are closed by the test.
• When a MockDirectoryWrapper is closed, it will throw an exception if it has any open files against it (with a stacktrace indicating where they were opened from).
• When a MockDirectoryWrapper is closed, it runs CheckIndex to test if the index was corrupted.
• MockDirectoryWrapper simulates some "features" of Windows, such as refusing to write/delete to open files.

Nested Class Summary

static class	MockDirectoryWrapper.Failure Objects that represent fail-able conditions.
static class	MockDirectoryWrapper.Throttling

Field Summary

Fields inherited from class org.apache.lucene.store.Directory

isOpen, lockFactory

Constructor Summary

MockDirectoryWrapper(Random random, Directory delegate)

Method Summary

void	clearCrash()
void	clearLock(String name) Attempt to clear (forcefully unlock and remove) the specified lock.
void	close() Closes the store.
void	copy(Directory to, String src, String dest) Copies the file src to Directory to under the new file name dest.
void	crash() Simulates a crash of OS or machine by overwriting unsynced files.
IndexOutput	createOutput(String name) Creates a new, empty file in the directory with the given name.
void	deleteFile(String name) Removes an existing file in the directory.
void	failOn(MockDirectoryWrapper.Failure fail) add a Failure object to the list of objects to be evaluated at every potential failure point
boolean	fileExists(String name) Returns true iff a file with the given name exists.
long	fileLength(String name) Returns the length of a file in the directory.
long	fileModified(String name) Returns the time the named file was last modified.
boolean	getCheckIndexOnClose()
int	getInputCloneCount()
LockFactory	getLockFactory() Get the LockFactory that this Directory instance is using for its locking implementation.
String	getLockID() Return a string identifier that uniquely differentiates this Directory instance from other Directory instances.
long	getMaxSizeInBytes()
long	getMaxUsedSizeInBytes() Returns the peek actual storage used (bytes) in this directory.
boolean	getNoDeleteOpenFile()
Set<String>	getOpenDeletedFiles()
double	getRandomIOExceptionRate()
long	getRecomputedActualSizeInBytes() Like getRecomputedSizeInBytes(), but, uses actual file lengths rather than buffer allocations (which are quantized up to nearest RAMOutputStream.BUFFER_SIZE (now 1024) bytes.
long	getRecomputedSizeInBytes() Provided for testing purposes.
boolean	isOpen()
String[]	listAll() Returns an array of strings, one for each file in the directory.
Lock	makeLock(String name) Construct a Lock.
IndexInput	openInput(String name) Returns a stream reading an existing file.
void	removeIndexInput(IndexInput in, String name)
void	removeIndexOutput(IndexOutput out, String name)
void	resetMaxUsedSizeInBytes()
void	setAssertNoUnrefencedFilesOnClose(boolean v)
void	setCheckIndexOnClose(boolean value) Set whether or not checkindex should be run on close
void	setFailOnCreateOutput(boolean v)
void	setFailOnOpenInput(boolean v)
void	setLockFactory(LockFactory lockFactory) Set the LockFactory that this Directory instance should use for its locking implementation.
void	setMaxSizeInBytes(long maxSize)
void	setNoDeleteOpenFile(boolean value) Emulate windows whereby deleting an open file is not allowed (raise IOException).
void	setPreventDoubleWrite(boolean value) If set to true, we throw an IOException if the same file is opened by createOutput, ever.
void	setRandomIOExceptionRate(double rate) If 0.0, no exceptions will be thrown.
void	setThrottling(MockDirectoryWrapper.Throttling throttling)
void	setTrackDiskUsage(boolean v)
long	sizeInBytes()
void	sync(Collection<String> names) Ensure that any writes to these files are moved to stable storage.
void	sync(String name) Deprecated.
String	toString()
void	touchFile(String name) Deprecated.

Methods inherited from class org.apache.lucene.store.Directory

copy, ensureOpen, openInput

Methods inherited from class java.lang.Object

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

Constructor Detail

MockDirectoryWrapper

public MockDirectoryWrapper(Random random,
                            Directory delegate)

Method Detail

getInputCloneCount

public int getInputCloneCount()

setTrackDiskUsage

public void setTrackDiskUsage(boolean v)

setPreventDoubleWrite

public void setPreventDoubleWrite(boolean value)

If set to true, we throw an IOException if the same file is opened by createOutput, ever.

sync

@Deprecated
public void sync(String name)
          throws IOException

Deprecated.

Description copied from class: Directory

Ensure that any writes to this file are moved to stable storage. Lucene uses this to properly commit changes to the index, to prevent a machine/OS crash from corrupting the index.

Overrides:

sync in class Directory

Throws:

IOException

setThrottling

public void setThrottling(MockDirectoryWrapper.Throttling throttling)

sync

public void sync(Collection<String> names)
          throws IOException

Description copied from class: Directory

Ensure that any writes to these files are moved to stable storage. Lucene uses this to properly commit changes to the index, to prevent a machine/OS crash from corrupting the index.

NOTE: Clients may call this method for same files over and over again, so some impls might optimize for that. For other impls the operation can be a noop, for various reasons.

Overrides:

sync in class Directory

Throws:

IOException

toString

public String toString()

Overrides:

toString in class Directory

sizeInBytes

public final long sizeInBytes()
                       throws IOException

Throws:

IOException

crash

public void crash()
           throws IOException

Simulates a crash of OS or machine by overwriting unsynced files.

Throws:

IOException

clearCrash

public void clearCrash()
                throws IOException

Throws:

IOException

setMaxSizeInBytes

public void setMaxSizeInBytes(long maxSize)

getMaxSizeInBytes

public long getMaxSizeInBytes()

getMaxUsedSizeInBytes

public long getMaxUsedSizeInBytes()

Returns the peek actual storage used (bytes) in this directory.

resetMaxUsedSizeInBytes

public void resetMaxUsedSizeInBytes()
                             throws IOException

Throws:

IOException

setNoDeleteOpenFile

public void setNoDeleteOpenFile(boolean value)

Emulate windows whereby deleting an open file is not allowed (raise IOException).

getNoDeleteOpenFile

public boolean getNoDeleteOpenFile()

setCheckIndexOnClose

public void setCheckIndexOnClose(boolean value)

Set whether or not checkindex should be run on close

getCheckIndexOnClose

public boolean getCheckIndexOnClose()

setRandomIOExceptionRate

public void setRandomIOExceptionRate(double rate)

If 0.0, no exceptions will be thrown. Else this should be a double 0.0 - 1.0. We will randomly throw an IOException on the first write to an OutputStream based on this probability.

getRandomIOExceptionRate

public double getRandomIOExceptionRate()

deleteFile

public void deleteFile(String name)
                throws IOException

Description copied from class: Directory

Removes an existing file in the directory.

Specified by:

deleteFile in class Directory

Throws:

IOException

getOpenDeletedFiles

public Set<String> getOpenDeletedFiles()

setFailOnCreateOutput

public void setFailOnCreateOutput(boolean v)

createOutput

public IndexOutput createOutput(String name)
                         throws IOException

Description copied from class: Directory

Creates a new, empty file in the directory with the given name. Returns a stream writing this file.

Specified by:

createOutput in class Directory

Throws:

IOException

setFailOnOpenInput

public void setFailOnOpenInput(boolean v)

openInput

public IndexInput openInput(String name)
                     throws IOException

Description copied from class: Directory

Returns a stream reading an existing file.

Specified by:

openInput in class Directory

Throws:

IOException

getRecomputedSizeInBytes

public final long getRecomputedSizeInBytes()
                                    throws IOException

Provided for testing purposes. Use sizeInBytes() instead.

Throws:

IOException

getRecomputedActualSizeInBytes

public final long getRecomputedActualSizeInBytes()
                                          throws IOException

Like getRecomputedSizeInBytes(), but, uses actual file lengths rather than buffer allocations (which are quantized up to nearest RAMOutputStream.BUFFER_SIZE (now 1024) bytes.

Throws:

IOException

setAssertNoUnrefencedFilesOnClose

public void setAssertNoUnrefencedFilesOnClose(boolean v)

close

public void close()
           throws IOException

Description copied from class: Directory

Closes the store.

Specified by:

close in interface Closeable

Specified by:

close in class Directory

Throws:

IOException

removeIndexOutput

public void removeIndexOutput(IndexOutput out,
                              String name)

removeIndexInput

public void removeIndexInput(IndexInput in,
                             String name)

isOpen

public boolean isOpen()

failOn

public void failOn(MockDirectoryWrapper.Failure fail)

add a Failure object to the list of objects to be evaluated at every potential failure point

listAll

public String[] listAll()
                 throws IOException

Description copied from class: Directory

Returns an array of strings, one for each file in the directory.

Specified by:

listAll in class Directory

Throws:

NoSuchDirectoryException - if the directory is not prepared for any write operations (such as Directory.createOutput(String)).

IOException - in case of other IO errors

fileExists

public boolean fileExists(String name)
                   throws IOException

Description copied from class: Directory

Returns true iff a file with the given name exists.

Specified by:

fileExists in class Directory

Throws:

IOException

fileModified

public long fileModified(String name)
                  throws IOException

Description copied from class: Directory

Returns the time the named file was last modified.

Specified by:

fileModified in class Directory

Throws:

IOException

touchFile

@Deprecated
public void touchFile(String name)
               throws IOException

Deprecated.

Description copied from class: Directory

Set the modified time of an existing file to now.

Specified by:

touchFile in class Directory

Throws:

IOException

fileLength

public long fileLength(String name)
                throws IOException

Description copied from class: Directory

Returns the length of a file in the directory. This method follows the following contract:

• Throws FileNotFoundException if the file does not exist
• Returns a value ≥0 if the file exists, which specifies its length.

Specified by:

fileLength in class Directory

Parameters:

name - the name of the file for which to return the length.

Throws:

FileNotFoundException - if the file does not exist.

IOException - if there was an IO error while retrieving the file's length.

makeLock

public Lock makeLock(String name)

Description copied from class: Directory

Construct a Lock.

Overrides:

makeLock in class Directory

Parameters:

name - the name of the lock file

clearLock

public void clearLock(String name)
               throws IOException

Description copied from class: Directory

Attempt to clear (forcefully unlock and remove) the specified lock. Only call this at a time when you are certain this lock is no longer in use.

Overrides:

clearLock in class Directory

Parameters:

name - name of the lock to be cleared.

Throws:

IOException

setLockFactory

public void setLockFactory(LockFactory lockFactory)
                    throws IOException

Description copied from class: Directory

Set the LockFactory that this Directory instance should use for its locking implementation. Each * instance of LockFactory should only be used for one directory (ie, do not share a single instance across multiple Directories).

Overrides:

setLockFactory in class Directory

Parameters:

lockFactory - instance of LockFactory.

Throws:

IOException

getLockFactory

public LockFactory getLockFactory()

Description copied from class: Directory

Get the LockFactory that this Directory instance is using for its locking implementation. Note that this may be null for Directory implementations that provide their own locking implementation.

Overrides:

getLockFactory in class Directory

getLockID

public String getLockID()

Description copied from class: Directory

Return a string identifier that uniquely differentiates this Directory instance from other Directory instances. This ID should be the same if two Directory instances (even in different JVMs and/or on different machines) are considered "the same index". This is how locking "scopes" to the right index.

Overrides:

getLockID in class Directory

copy

public void copy(Directory to,
                 String src,
                 String dest)
          throws IOException

Description copied from class: Directory

Copies the file src to Directory to under the new file name dest.

If you want to copy the entire source directory to the destination one, you can do so like this:

 Directory to; // the directory to copy to
 for (String file : dir.listAll()) {
   dir.copy(to, file, newFile); // newFile can be either file, or a new name
 }
 

NOTE: this method does not check whether dest exist and will overwrite it if it does.

Overrides:

copy in class Directory

Throws:

IOException