Class MemoryMappedFileManager
java.lang.Object
org.apache.logging.log4j.core.appender.AbstractManager
org.apache.logging.log4j.core.appender.OutputStreamManager
org.apache.logging.log4j.core.appender.MemoryMappedFileManager
- All Implemented Interfaces:
AutoCloseable
,ByteBufferDestination
Extends OutputStreamManager but instead of using a buffered output stream, this class maps a region of a file into
memory and writes to this memory region.
- Since:
- 2.1
- See Also:
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Nested Class Summary
Nested ClassesModifier and TypeClassDescriptionprivate static class
Factory Data.private static class
Factory to create a MemoryMappedFileManager.Nested classes/interfaces inherited from class org.apache.logging.log4j.core.appender.AbstractManager
AbstractManager.AbstractFactoryData
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Field Summary
FieldsModifier and TypeFieldDescriptionprivate final String
(package private) static final int
Default length of region to map.private static final MemoryMappedFileManager.MemoryMappedFileManagerFactory
private final boolean
private MappedByteBuffer
private long
private static final int
private static final double
private final RandomAccessFile
private final int
Fields inherited from class org.apache.logging.log4j.core.appender.OutputStreamManager
byteBuffer, layout
Fields inherited from class org.apache.logging.log4j.core.appender.AbstractManager
count, LOGGER
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Constructor Summary
ConstructorsModifierConstructorDescriptionprotected
MemoryMappedFileManager
(RandomAccessFile file, String fileName, OutputStream os, boolean immediateFlush, long position, int regionLength, String advertiseURI, Layout<? extends Serializable> layout, boolean writeHeader) -
Method Summary
Modifier and TypeMethodDescriptionboolean
drain
(ByteBuffer buf) Drains the ByteBufferDestination's buffer into the destination.void
flush()
Flushes any buffers.protected void
flushBuffer
(ByteBuffer buffer) Drains the ByteBufferDestination's buffer into the destination.Returns thisByteBufferDestination
's buffer.Gets this FileManager's content format specified by:static MemoryMappedFileManager
getFileManager
(String fileName, boolean append, boolean immediateFlush, int regionLength, String advertiseURI, Layout<? extends Serializable> layout) Returns the MemoryMappedFileManager.Returns the name of the File being managed.int
Returns the length of the memory mapped region.Deprecated.end-of-batch on the event is used instead.boolean
Returnstrue
if the content of the buffer should be forced to the storage device on every write,false
otherwise.static MappedByteBuffer
mmap
(FileChannel fileChannel, String fileName, long start, int size) private void
remap()
void
setEndOfBatch
(boolean endOfBatch) Deprecated.end-of-batch on the event is used instead.private static void
protected void
write
(byte[] bytes, int offset, int length, boolean immediateFlush) Some output streams synchronize writes while others do not.Methods inherited from class org.apache.logging.log4j.core.appender.OutputStreamManager
createOutputStream, flushDestination, getManager, getOutputStream, hasOutputStream, isOpen, releaseSub, setOutputStream, skipFooter, write, write, write, writeBytes, writeBytes, writeFooter, writeHeader, writeToDestination
Methods inherited from class org.apache.logging.log4j.core.appender.AbstractManager
close, getCount, getLoggerContext, getManager, getManagerCount, getName, getStrSubstitutor, hasManager, log, logDebug, logError, logger, logWarn, narrow, release, stop, updateData
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Field Details
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DEFAULT_REGION_LENGTH
static final int DEFAULT_REGION_LENGTHDefault length of region to map.- See Also:
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MAX_REMAP_COUNT
private static final int MAX_REMAP_COUNT- See Also:
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FACTORY
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NANOS_PER_MILLISEC
private static final double NANOS_PER_MILLISEC- See Also:
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immediateFlush
private final boolean immediateFlush -
regionLength
private final int regionLength -
advertiseURI
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randomAccessFile
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mappedBuffer
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mappingOffset
private long mappingOffset
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Constructor Details
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MemoryMappedFileManager
protected MemoryMappedFileManager(RandomAccessFile file, String fileName, OutputStream os, boolean immediateFlush, long position, int regionLength, String advertiseURI, Layout<? extends Serializable> layout, boolean writeHeader) throws IOException - Throws:
IOException
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Method Details
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getFileManager
public static MemoryMappedFileManager getFileManager(String fileName, boolean append, boolean immediateFlush, int regionLength, String advertiseURI, Layout<? extends Serializable> layout) Returns the MemoryMappedFileManager.- Parameters:
fileName
- The name of the file to manage.append
- true if the file should be appended to, false if it should be overwritten.immediateFlush
- true if the contents should be flushed to disk on every writeregionLength
- The mapped region length.advertiseURI
- the URI to use when advertising the filelayout
- The layout.- Returns:
- A MemoryMappedFileManager for the File.
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isEndOfBatch
Deprecated.end-of-batch on the event is used instead.No longer used, theLogEvent.isEndOfBatch()
attribute is used instead.- Returns:
Boolean.FALSE
.
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setEndOfBatch
Deprecated.end-of-batch on the event is used instead.No longer used, theLogEvent.isEndOfBatch()
attribute is used instead. This method is a no-op. -
write
protected void write(byte[] bytes, int offset, int length, boolean immediateFlush) Description copied from class:OutputStreamManager
Some output streams synchronize writes while others do not. Synchronizing here insures that log events won't be intertwined.- Overrides:
write
in classOutputStreamManager
- Parameters:
bytes
- The serialized Log event.offset
- The offset into the byte array.length
- The number of bytes to write.immediateFlush
- flushes immediately after writing.
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remap
private void remap() -
flush
public void flush()Description copied from class:OutputStreamManager
Flushes any buffers.- Overrides:
flush
in classOutputStreamManager
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closeOutputStream
public boolean closeOutputStream()- Overrides:
closeOutputStream
in classOutputStreamManager
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mmap
public static MappedByteBuffer mmap(FileChannel fileChannel, String fileName, long start, int size) throws IOException - Throws:
IOException
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unsafeUnmap
- Throws:
PrivilegedActionException
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getFileName
Returns the name of the File being managed.- Returns:
- The name of the File being managed.
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getRegionLength
public int getRegionLength()Returns the length of the memory mapped region.- Returns:
- the length of the mapped region
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isImmediateFlush
public boolean isImmediateFlush()Returnstrue
if the content of the buffer should be forced to the storage device on every write,false
otherwise.- Returns:
- whether each write should be force-sync'ed
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getContentFormat
Gets this FileManager's content format specified by:Key: "fileURI" Value: provided "advertiseURI" param.
- Overrides:
getContentFormat
in classAbstractManager
- Returns:
- Map of content format keys supporting FileManager
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flushBuffer
Description copied from class:OutputStreamManager
Drains the ByteBufferDestination's buffer into the destination. By default this callsOutputStreamManager.write(byte[], int, int, boolean)
with the buffer contents. The underlying stream is not flushed.- Overrides:
flushBuffer
in classOutputStreamManager
- See Also:
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getByteBuffer
Description copied from class:OutputStreamManager
Returns thisByteBufferDestination
's buffer.- Specified by:
getByteBuffer
in interfaceByteBufferDestination
- Overrides:
getByteBuffer
in classOutputStreamManager
- Returns:
- the buffer
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drain
Description copied from class:OutputStreamManager
Drains the ByteBufferDestination's buffer into the destination. By default this callsOutputStreamManager.flushBuffer(ByteBuffer)
with the specified buffer. Subclasses may override.Do not call this method lightly! For some subclasses this is a very expensive operation. For example,
MemoryMappedFileManager
will assume this method was called because the end of the mapped region was reached during a text encoding operation and will remap its buffer.To just flush the buffered contents to the underlying stream, call
OutputStreamManager.flushBuffer(ByteBuffer)
directly instead.- Specified by:
drain
in interfaceByteBufferDestination
- Overrides:
drain
in classOutputStreamManager
- Parameters:
buf
- the buffer whose contents to write the destination- Returns:
- the specified buffer
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