org.apache.rocketmq.mqtt.exporter.http

类 BackedFileOutputStream

java.lang.Object

java.io.OutputStream

org.apache.rocketmq.mqtt.exporter.http.BackedFileOutputStream

所有已实现的接口:

Closeable, Flushable, AutoCloseable

public class BackedFileOutputStream
extends OutputStream

An OutputStream that starts buffering to a byte array, but switches to file buffering once the data reaches a configurable size.

Temporary files created by this stream may live in the local filesystem until either:

• reset() is called (removing the data in this stream and deleting the file), or...
• this stream (or, more precisely, its asByteSource() view) is finalized during garbage collection, AND this stream was not constructed with the 1-arg constructor

This class is thread-safe.

构造器概要

构造器

构造器和说明
BackedFileOutputStream(int fileThreshold) Creates a new instance that uses the given file threshold, and does not reset the data when the ByteSource returned by asByteSource() is finalized.
BackedFileOutputStream(int fileThreshold, boolean resetOnFinalize, File parentDirectory) Creates a new instance that uses the given file threshold, and optionally resets the data when the ByteSource returned by asByteSource() is finalized.

方法概要

限定符和类型	方法和说明
com.google.common.io.ByteSource	asByteSource() Returns a readable ByteSource view of the data that has been written to this stream.
void	close()
void	flush()
File	getFile() Returns the file holding the data (possibly null).
void	reset() Calls close() if not already closed, and then resets this object back to its initial state, for reuse.
long	size()
void	write(byte[] b)
void	write(byte[] b, int off, int len)
void	write(int b)
void	writeTo(OutputStream out)

从类继承的方法 java.lang.Object

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

构造器详细资料

BackedFileOutputStream

public BackedFileOutputStream(int fileThreshold)

Creates a new instance that uses the given file threshold, and does not reset the data when the ByteSource returned by asByteSource() is finalized.

参数:

fileThreshold - the number of bytes before the stream should switch to buffering to a file

BackedFileOutputStream

public BackedFileOutputStream(int fileThreshold,
                              boolean resetOnFinalize,
                              File parentDirectory)

Creates a new instance that uses the given file threshold, and optionally resets the data when the ByteSource returned by asByteSource() is finalized.

参数:

fileThreshold - the number of bytes before the stream should switch to buffering to a file

resetOnFinalize - if true, the reset() method will be called when the ByteSource returned by asByteSource() is finalized

方法详细资料

getFile

public File getFile()

Returns the file holding the data (possibly null).

asByteSource

public com.google.common.io.ByteSource asByteSource()

Returns a readable ByteSource view of the data that has been written to this stream.

从以下版本开始:

15.0

reset

public void reset()
           throws IOException

Calls close() if not already closed, and then resets this object back to its initial state, for reuse. If data was buffered to a file, it will be deleted.

抛出:

IOException - if an I/O error occurred while deleting the file buffer

write

public void write(int b)
           throws IOException

指定者:

write 在类中 OutputStream

抛出:

IOException

write

public void write(byte[] b)
           throws IOException

覆盖:

write 在类中 OutputStream

抛出:

IOException

write

public void write(byte[] b,
                  int off,
                  int len)
           throws IOException

覆盖:

write 在类中 OutputStream

抛出:

IOException

close

public void close()
           throws IOException

指定者:

close 在接口中 Closeable

指定者:

close 在接口中 AutoCloseable

覆盖:

close 在类中 OutputStream

抛出:

IOException

flush

public void flush()
           throws IOException

指定者:

flush 在接口中 Flushable

覆盖:

flush 在类中 OutputStream

抛出:

IOException

size

public long size()

writeTo

public void writeTo(OutputStream out)
             throws IOException

抛出:

IOException