org.apache.cassandra.db.commitlog

Class CommitLogDescriptor

java.lang.Object

org.apache.cassandra.db.commitlog.CommitLogDescriptor

public class CommitLogDescriptor
extends java.lang.Object

Field Summary

Fields

Modifier and Type	Field and Description
ParameterizedClass	compression
static int	current_version Increment this number if there is a changes in the commit log disc layout or MessagingVersion changes.
long	id
static int	VERSION_12
static int	VERSION_20
static int	VERSION_21
static int	VERSION_22
static int	VERSION_30

Constructor Summary

Constructors

Constructor and Description
CommitLogDescriptor(int version, long id, ParameterizedClass compression)
CommitLogDescriptor(long id, ParameterizedClass compression)

Method Summary

Modifier and Type	Method and Description
boolean	equals(CommitLogDescriptor that)
boolean	equals(java.lang.Object that)
boolean	equalsIgnoringCompression(CommitLogDescriptor that)
java.lang.String	fileName()
static CommitLogDescriptor	fromFileName(java.lang.String name)
static CommitLogDescriptor	fromHeader(java.io.File file)
int	getMessagingVersion()
static boolean	isValid(java.lang.String filename)
static CommitLogDescriptor	readHeader(java.io.DataInput input)
java.lang.String	toString()
static void	writeHeader(java.nio.ByteBuffer out, CommitLogDescriptor descriptor)

Methods inherited from class java.lang.Object

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

Field Detail

VERSION_12

public static final int VERSION_12

See Also:

Constant Field Values

VERSION_20

public static final int VERSION_20

See Also:

Constant Field Values

VERSION_21

public static final int VERSION_21

See Also:

Constant Field Values

VERSION_22

public static final int VERSION_22

See Also:

Constant Field Values

VERSION_30

public static final int VERSION_30

See Also:

Constant Field Values

current_version

public static final int current_version

Increment this number if there is a changes in the commit log disc layout or MessagingVersion changes. Note: make sure to handle getMessagingVersion()

See Also:

Constant Field Values

id

public final long id

compression

public final ParameterizedClass compression

Constructor Detail

CommitLogDescriptor

public CommitLogDescriptor(int version,
                           long id,
                           ParameterizedClass compression)

CommitLogDescriptor

public CommitLogDescriptor(long id,
                           ParameterizedClass compression)

Method Detail

writeHeader

public static void writeHeader(java.nio.ByteBuffer out,
                               CommitLogDescriptor descriptor)

fromHeader

public static CommitLogDescriptor fromHeader(java.io.File file)

readHeader

public static CommitLogDescriptor readHeader(java.io.DataInput input)
                                      throws java.io.IOException

Throws:

java.io.IOException

fromFileName

public static CommitLogDescriptor fromFileName(java.lang.String name)

getMessagingVersion

public int getMessagingVersion()

fileName

public java.lang.String fileName()

isValid

public static boolean isValid(java.lang.String filename)

Parameters:

filename - the filename to check

Returns:

true if filename could be a commit log based on it's filename

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

equals

public boolean equals(java.lang.Object that)

Overrides:

equals in class java.lang.Object

equalsIgnoringCompression

public boolean equalsIgnoringCompression(CommitLogDescriptor that)

equals

public boolean equals(CommitLogDescriptor that)