net.openhft.chronicle.queue.impl.single

Class SingleChronicleQueue

java.lang.Object

net.openhft.chronicle.queue.impl.single.SingleChronicleQueue

All Implemented Interfaces:

Closeable, AutoCloseable, ChronicleQueue, RollingChronicleQueue

public class SingleChronicleQueue
extends Object
implements RollingChronicleQueue

Field Summary

Fields

Modifier and Type	Field and Description
protected ThreadLocal<WeakReference<ExcerptAppender>>	excerptAppenderThreadLocal
protected int	sourceId
static String	SUFFIX

Fields inherited from interface net.openhft.chronicle.queue.ChronicleQueue

TEST_BLOCK_SIZE

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	SingleChronicleQueue(SingleChronicleQueueBuilder<?> builder)

Method Summary

Modifier and Type	Method and Description
ExcerptAppender	acquireAppender() An Appender can be used to writeBytes new excerpts sequentially to the upper.
<T> void	addCloseListener(T key, Consumer<T> closer)
long	blockSize()
long	bufferCapacity()
boolean	buffered()
void	clear() Remove all the entries in the queue.
void	close()
long	countExcerpts(long fromIndex, long toIndex) Will give you the number of excerpts between 2 index’s ( as exists on the current file system ).
ExcerptTailer	createTailer() Tailers are NOT thread-safe, sharing the Tailer between threads will lead to errors and unpredictable behaviour.
int	cycle()
int	deltaCheckpointInterval()
static File	directoryListingPath(File queueFolder)
String	dump() Dump a Queue in YAML format.
void	dump(Writer writer, long fromIndex, long toIndex) Dump a range of entries to a Writer
long	entryCount() Counts the number of messages in this queue instance.
long	epoch()
net.openhft.chronicle.core.threads.EventLoop	eventLoop()
long	exceptsPerCycle(int cycle)
File	file()
protected int	fileToCycle(File queueFile)
int	firstCycle()
long	firstIndex()
int	indexCount()
int	indexSpacing()
boolean	isClosed()
long	lastAcknowledgedIndexReplicated()
int	lastCycle()
NavigableSet<Long>	listCyclesBetween(int lowerCycle, int upperCycle)
protected ExcerptAppender	newAppender()
int	nextCycle(int cycle, TailerDirection direction) the next available cycle, no cycle will be created by this method, this method is typically used by a tailer to jump to the next cycle when the cycles are not adjacent.
Consumer<net.openhft.chronicle.bytes.BytesRingBufferStats>	onRingBufferStats()
long	overlapSize()
QueueLock	queueLock()
StoreRecoveryFactory	recoverySupplier()
void	release(CommonStore store)
RollCycle	rollCycle()
int	sourceId()
WireStore	storeForCycle(int cycle, long epoch, boolean createIfAbsent)
net.openhft.chronicle.core.time.TimeProvider	time()
String	toString()
net.openhft.chronicle.wire.WireType	wireType()

Methods inherited from class java.lang.Object

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

Methods inherited from interface net.openhft.chronicle.queue.ChronicleQueue

createAppender, dump, methodWriter, methodWriterBuilder, numberOfReferences

Methods inherited from interface net.openhft.chronicle.core.io.Closeable

closeQuietly, closeQuietly, notifyClosing

Field Detail

SUFFIX

public static final String SUFFIX

See Also:

Constant Field Values

excerptAppenderThreadLocal

protected final ThreadLocal<WeakReference<ExcerptAppender>> excerptAppenderThreadLocal

sourceId

protected int sourceId

Constructor Detail

SingleChronicleQueue

protected SingleChronicleQueue(@NotNull
                               SingleChronicleQueueBuilder<?> builder)

Method Detail

sourceId

public int sourceId()

Specified by:

sourceId in interface ChronicleQueue

clear

public void clear()

Description copied from interface: ChronicleQueue

Remove all the entries in the queue.

Specified by:

clear in interface ChronicleQueue

file

@NotNull
public File file()

Specified by:

file in interface ChronicleQueue

Returns:

the base file where ChronicleQueue stores its data.

dump

@NotNull
public String dump()

Description copied from interface: ChronicleQueue

Dump a Queue in YAML format.

Specified by:

dump in interface ChronicleQueue

Returns:

the contents of the Queue as YAML.

dump

public void dump(@NotNull
                 Writer writer,
                 long fromIndex,
                 long toIndex)

Description copied from interface: ChronicleQueue

Dump a range of entries to a Writer

Specified by:

dump in interface ChronicleQueue

Parameters:

writer - to write to

fromIndex - first index to include

toIndex - last index to include.

indexCount

public int indexCount()

Specified by:

indexCount in interface RollingChronicleQueue

Returns:

the number of entries in an index meta data entry

indexSpacing

public int indexSpacing()

Specified by:

indexSpacing in interface RollingChronicleQueue

Returns:

the spacing between indexed entries. If 1 then every entry is indexed.

epoch

public long epoch()

Specified by:

epoch in interface RollingChronicleQueue

rollCycle

@NotNull
public RollCycle rollCycle()

Specified by:

rollCycle in interface RollingChronicleQueue

recoverySupplier

public StoreRecoveryFactory recoverySupplier()

Specified by:

recoverySupplier in interface RollingChronicleQueue

deltaCheckpointInterval

public int deltaCheckpointInterval()

Specified by:

deltaCheckpointInterval in interface RollingChronicleQueue

Returns:

the checkpointInterval used by delta wire

buffered

public boolean buffered()

Returns:

if we uses a ring buffer to buffer the appends, the Excerpts are written to the Chronicle Queue using a background thread

eventLoop

@Nullable
public net.openhft.chronicle.core.threads.EventLoop eventLoop()

newAppender

@NotNull
protected ExcerptAppender newAppender()

acquireAppender

@NotNull
public ExcerptAppender acquireAppender()

Description copied from interface: ChronicleQueue

An Appender can be used to writeBytes new excerpts sequentially to the upper.

Appenders are NOT thread-safe, sharing the Appender between threads will lead to errors and unpredictable behaviour. This method returns ThreadLocal appender, so does not produce any garbage, hence it's safe to simply call this method every time an appender is needed.

Specified by:

acquireAppender in interface ChronicleQueue

Returns:

A thread local Appender for writing new entries to the end.

queueLock

@NotNull
public QueueLock queueLock()

Specified by:

queueLock in interface RollingChronicleQueue

createTailer

@NotNull
public ExcerptTailer createTailer()

Description copied from interface: ChronicleQueue

Tailers are NOT thread-safe, sharing the Tailer between threads will lead to errors and unpredictable behaviour.

Specified by:

createTailer in interface ChronicleQueue

Returns:

a new ExcerptTailer to read sequentially.

storeForCycle

@Nullable
public final WireStore storeForCycle(int cycle,
                                               long epoch,
                                               boolean createIfAbsent)

Specified by:

storeForCycle in interface RollingChronicleQueue

Parameters:

cycle - the cycle

epoch - an epoch offset as the number of number of milliseconds since January 1, 1970, 00:00:00 GMT

createIfAbsent - create missing stores if true, or return null if missing

Returns:

the WireStore associated with this cycle, or null if !createIfAbsent is false and absent

nextCycle

public int nextCycle(int cycle,
                     @NotNull
                     TailerDirection direction)
              throws ParseException

Description copied from interface: RollingChronicleQueue

the next available cycle, no cycle will be created by this method, this method is typically used by a tailer to jump to the next cycle when the cycles are not adjacent.

Specified by:

nextCycle in interface RollingChronicleQueue

Parameters:

cycle - the current cycle

direction - the direction

Returns:

the next available cycle from the current cycle, or -1 if there is no next cycle

Throws:

ParseException

exceptsPerCycle

public long exceptsPerCycle(int cycle)

countExcerpts

public long countExcerpts(long fromIndex,
                          long toIndex)
                   throws IllegalStateException

Will give you the number of excerpts between 2 index’s ( as exists on the current file system ). If intermediate chronicle files are removed this will effect the result.

Specified by:

countExcerpts in interface RollingChronicleQueue

Parameters:

fromIndex - the lower index

toIndex - the higher index

Returns:

will give you the number of excerpts between 2 index’s. It’s not as simple as just subtracting one number from the other.

Throws:

IllegalStateException - if we are not able to read the chronicle files

listCyclesBetween

public NavigableSet<Long> listCyclesBetween(int lowerCycle,
                                            int upperCycle)
                                     throws ParseException

Throws:

ParseException

addCloseListener

public <T> void addCloseListener(T key,
                                 Consumer<T> closer)

isClosed

public boolean isClosed()

close

public void close()

Specified by:

close in interface Closeable

Specified by:

close in interface AutoCloseable

release

public final void release(@Nullable
                          CommonStore store)

Specified by:

release in interface RollingChronicleQueue

Parameters:

store - the store to release

cycle

public final int cycle()

Specified by:

cycle in interface RollingChronicleQueue

Returns:

the current cycle

firstIndex

public long firstIndex()

Specified by:

firstIndex in interface ChronicleQueue

Returns:

the lowest valid index available, or Long.MAX_VALUE if none are found

entryCount

public long entryCount()

Counts the number of messages in this queue instance.

Returns:

the number of document excerpts

firstCycle

public int firstCycle()

Specified by:

firstCycle in interface RollingChronicleQueue

Returns:

the first cycle number found, or Integer.MAX_VALUE is none found.

lastCycle

public int lastCycle()

Specified by:

lastCycle in interface RollingChronicleQueue

Returns:

the lastCycle available or Integer.MIN_VALUE if none is found.

fileToCycle

protected int fileToCycle(File queueFile)

onRingBufferStats

@NotNull
public Consumer<net.openhft.chronicle.bytes.BytesRingBufferStats> onRingBufferStats()

blockSize

public long blockSize()

overlapSize

public long overlapSize()

wireType

@NotNull
public net.openhft.chronicle.wire.WireType wireType()

Specified by:

wireType in interface ChronicleQueue

Returns:

the type of wire used, for example WireTypes.TEXT or WireTypes.BINARY

bufferCapacity

public long bufferCapacity()

toString

@NotNull
public String toString()

Overrides:

toString in class Object

time

@NotNull
public net.openhft.chronicle.core.time.TimeProvider time()

directoryListingPath

@NotNull
public static File directoryListingPath(File queueFolder)

lastAcknowledgedIndexReplicated

public long lastAcknowledgedIndexReplicated()

Specified by:

lastAcknowledgedIndexReplicated in interface ChronicleQueue