Package org.apache.cassandra.db.commitlog

Class CommitLogReader

java.lang.Object

org.apache.cassandra.db.commitlog.CommitLogReader

public class CommitLogReader
extends Object

Field Summary

Fields

Modifier and Type	Field	Description
static final int	ALL_MUTATIONS

Constructor Summary

Constructors

Constructor	Description
CommitLogReader()

Method Summary

Modifier and Type	Method	Description
Set<Map.Entry<TableId,AtomicInteger>>	getInvalidMutations()
void	readAllFiles(CommitLogReadHandler handler, File[] files)	Reads all passed in files with no minimum, no start, and no mutation limit.
void	readAllFiles(CommitLogReadHandler handler, File[] files, CommitLogPosition minPosition)	Reads all passed in files with minPosition, no start, and no mutation limit.
void	readCommitLogSegment(CommitLogReadHandler handler, File file, boolean tolerateTruncation)	Reads passed in file fully
void	readCommitLogSegment(CommitLogReadHandler handler, File file, int mutationLimit, boolean tolerateTruncation)	Reads passed in file fully, up to mutationLimit count
void	readCommitLogSegment(CommitLogReadHandler handler, File file, CommitLogPosition minPosition, boolean tolerateTruncation)	Reads all mutations from passed in file from minPosition
void	readCommitLogSegment(CommitLogReadHandler handler, File file, CommitLogPosition minPosition, int mutationLimit, boolean tolerateTruncation)	Reads mutations from file, handing them off to handler
protected void	readMutation(CommitLogReadHandler handler, byte[] inputBuffer, int size, CommitLogPosition minPosition, int entryLocation, CommitLogDescriptor desc)	Deserializes and passes a Mutation to the ICommitLogReadHandler requested

Methods inherited from class java.lang.Object

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

Field Details

ALL_MUTATIONS

public static final int ALL_MUTATIONS

See Also:

• Constant Field Values

Constructor Details

CommitLogReader

public CommitLogReader()

Method Details

getInvalidMutations

public Set<Map.Entry<TableId,AtomicInteger>> getInvalidMutations()

readAllFiles

public void readAllFiles(CommitLogReadHandler handler,
 File[] files)
                  throws IOException

Reads all passed in files with no minimum, no start, and no mutation limit.

Throws:

IOException

readAllFiles

public void readAllFiles(CommitLogReadHandler handler,
 File[] files,
 CommitLogPosition minPosition)
                  throws IOException

Reads all passed in files with minPosition, no start, and no mutation limit.

Throws:

IOException

readCommitLogSegment

public void readCommitLogSegment(CommitLogReadHandler handler,
 File file,
 boolean tolerateTruncation)
                          throws IOException

Reads passed in file fully

Throws:

IOException

readCommitLogSegment

public void readCommitLogSegment(CommitLogReadHandler handler,
 File file,
 CommitLogPosition minPosition,
 boolean tolerateTruncation)
                          throws IOException

Reads all mutations from passed in file from minPosition

Throws:

IOException

readCommitLogSegment

public void readCommitLogSegment(CommitLogReadHandler handler,
 File file,
 int mutationLimit,
 boolean tolerateTruncation)
                          throws IOException

Reads passed in file fully, up to mutationLimit count

Throws:

IOException

readCommitLogSegment

public void readCommitLogSegment(CommitLogReadHandler handler,
 File file,
 CommitLogPosition minPosition,
 int mutationLimit,
 boolean tolerateTruncation)
                          throws IOException

Reads mutations from file, handing them off to handler

Parameters:

handler - Handler that will take action based on deserialized Mutations

file - CommitLogSegment file to read

minPosition - Optional minimum CommitLogPosition - all segments with id larger or matching w/greater position will be read

mutationLimit - Optional limit on # of mutations to replay. Local ALL_MUTATIONS serves as marker to play all.

tolerateTruncation - Whether or not we should allow truncation of this file or throw if EOF found

Throws:

IOException

readMutation

protected void readMutation(CommitLogReadHandler handler,
 byte[] inputBuffer,
 int size,
 CommitLogPosition minPosition,
 int entryLocation,
 CommitLogDescriptor desc)
                     throws IOException

Deserializes and passes a Mutation to the ICommitLogReadHandler requested

Parameters:

handler - Handler that will take action based on deserialized Mutations

inputBuffer - raw byte array w/Mutation data

size - deserialized size of mutation

minPosition - We need to suppress replay of mutations that are before the required minPosition

entryLocation - filePointer offset of end of mutation within CommitLogSegment

desc - CommitLogDescriptor being worked on

Throws:

IOException