Class MemoryMappedFileManager
- java.lang.Object
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- org.apache.logging.log4j.core.appender.AbstractManager
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- org.apache.logging.log4j.core.appender.OutputStreamManager
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- org.apache.logging.log4j.core.appender.MemoryMappedFileManager
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- All Implemented Interfaces:
AutoCloseable
,ByteBufferDestination
public class MemoryMappedFileManager extends OutputStreamManager
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:
- http://www.codeproject.com/Tips/683614/Things-to-Know-about-Memory-Mapped-File-in-Java, http://bugs.java.com/view_bug.do?bug_id=6893654, http://bugs.java.com/view_bug.do?bug_id=4724038, http://stackoverflow.com/questions/9261316/memory-mapped-mappedbytebuffer-or-direct-bytebuffer-for-db-implementation
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Field Summary
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Fields inherited from class org.apache.logging.log4j.core.appender.OutputStreamManager
byteBuffer, layout
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Fields inherited from class org.apache.logging.log4j.core.appender.AbstractManager
count, LOGGER
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Constructor Summary
Constructors Modifier Constructor Description protected
MemoryMappedFileManager(RandomAccessFile file, String fileName, OutputStream os, boolean immediateFlush, long position, int regionLength, String advertiseURI, Layout<? extends Serializable> layout, boolean writeHeader)
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Method Summary
All Methods Static Methods Instance Methods Concrete Methods Modifier and Type Method Description boolean
closeOutputStream()
ByteBuffer
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.ByteBuffer
getByteBuffer()
Returns thisByteBufferDestination
's buffer.Map<String,String>
getContentFormat()
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.String
getFileName()
Returns the name of the File being managed.int
getRegionLength()
Returns the length of the memory mapped region.Boolean
isEndOfBatch()
boolean
isImmediateFlush()
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)
void
setEndOfBatch(boolean endOfBatch)
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, writeToDestination
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Methods inherited from class org.apache.logging.log4j.core.appender.AbstractManager
close, getCount, getLoggerContext, getManager, getName, hasManager, log, logDebug, logError, logger, logWarn, narrow, release, stop, updateData
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Constructor Detail
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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 Detail
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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
public Boolean isEndOfBatch()
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setEndOfBatch
public void setEndOfBatch(boolean endOfBatch)
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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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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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getFileName
public String 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
public Map<String,String> 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
protected void flushBuffer(ByteBuffer buffer)
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:
OutputStreamManager.flushDestination()
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getByteBuffer
public ByteBuffer 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
public ByteBuffer drain(ByteBuffer buf)
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 the destination- Returns:
- the specified buffer
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