Package io.vertx.reactivex.core.file

Class AsyncFile

java.lang.Object

io.vertx.reactivex.core.file.AsyncFile

All Implemented Interfaces:

io.vertx.lang.rx.RxDelegate, ReadStream<Buffer>, StreamBase, WriteStream<Buffer>

public class AsyncFile
extends Object
implements io.vertx.lang.rx.RxDelegate, ReadStream<Buffer>, WriteStream<Buffer>

Represents a file on the file-system which can be read from, or written to asynchronously.

This class also implements ReadStream and WriteStream. This allows the data to be piped to and from other streams, e.g. an HttpClientRequest instance, using the Pipe class

NOTE: This class has been automatically generated from the original non RX-ified interface using Vert.x codegen.

Field Summary

Fields

Modifier and Type	Field	Description
static io.vertx.lang.rx.TypeArg<AsyncFile>	__TYPE_ARG

Constructor Summary

Constructors

Constructor	Description
AsyncFile(AsyncFile delegate)
AsyncFile(Object delegate)

Method Summary

Modifier and Type	Method	Description
Future<Void>	close()	Close the file.
AsyncFile	drainHandler(Handler<Void> handler)	Set a drain handler on the stream.
Future<Void>	end()	Ends the stream.
Future<Void>	end(Buffer data)	Same as WriteStream.end() but writes some data to the stream before ending.
AsyncFile	endHandler(Handler<Void> endHandler)	Set an end handler.
boolean	equals(Object o)
AsyncFile	exceptionHandler(Handler<Throwable> handler)	Set an exception handler on the read stream and on the write stream.
AsyncFile	fetch(long amount)	Fetch the specified amount of elements.
Future<Void>	flush()	Flush any writes made to this file to underlying persistent storage.
AsyncFile	getDelegate()
long	getReadLength()
long	getWritePos()
AsyncFile	handler(Handler<Buffer> handler)	Set a data handler.
int	hashCode()
Future<AsyncFileLock>	lock()	Acquire a non-shared lock on the entire file.
Future<AsyncFileLock>	lock(long position, long size, boolean shared)	Acquire a lock on a portion of this file.
static AsyncFile	newInstance(AsyncFile arg)
AsyncFile	pause()	Pause the ReadStream, it sets the buffer in fetch mode and clears the actual demand.
Pipe<Buffer>	pipe()	Pause this stream and return a to transfer the elements of this stream to a destination .
Future<Void>	pipeTo(WriteStream<Buffer> dst)	Pipe this ReadStream to the WriteStream.
Future<Buffer>	read(Buffer buffer, int offset, long position, int length)	Reads length bytes of data from the file at position position in the file, asynchronously.
AsyncFile	resume()	Resume reading, and sets the buffer in flowing mode.
Completable	rxClose()	Close the file.
Completable	rxEnd()	Ends the stream.
Completable	rxEnd(Buffer data)	Same as WriteStream.end() but writes some data to the stream before ending.
Completable	rxFlush()	Flush any writes made to this file to underlying persistent storage.
Single<AsyncFileLock>	rxLock()	Acquire a non-shared lock on the entire file.
Single<AsyncFileLock>	rxLock(long position, long size, boolean shared)	Acquire a lock on a portion of this file.
Completable	rxPipeTo(WriteStream<Buffer> dst)	Pipe this ReadStream to the WriteStream.
Single<Buffer>	rxRead(Buffer buffer, int offset, long position, int length)	Reads length bytes of data from the file at position position in the file, asynchronously.
Single<Long>	rxSize()
<T> Single<T>	rxWithLock(long position, long size, boolean shared, Supplier<Future<T>> block)	Acquire a lock on a portion of this file.
<T> Single<T>	rxWithLock(Supplier<Future<T>> block)	Acquire a non-shared lock on the entire file.
Completable	rxWrite(Buffer data)	Write some data to the stream.
Completable	rxWrite(Buffer buffer, long position)	Write a Buffer to the file at position position in the file, asynchronously.
AsyncFile	setReadBufferSize(int readBufferSize)	Sets the buffer size that will be used to read the data from the file.
AsyncFile	setReadLength(long readLength)	Sets the number of bytes that will be read when using the file as a ReadStream.
AsyncFile	setReadPos(long readPos)	Sets the position from which data will be read from when using the file as a ReadStream.
AsyncFile	setWritePos(long writePos)	Sets the position from which data will be written when using the file as a WriteStream.
AsyncFile	setWriteQueueMaxSize(int maxSize)	Set the maximum size of the write queue to maxSize.
Future<Long>	size()
long	sizeBlocking()	Like size() but blocking.
Flowable<Buffer>	toFlowable()
Observable<Buffer>	toObservable()
WriteStreamObserver<Buffer>	toObserver()
String	toString()
WriteStreamSubscriber<Buffer>	toSubscriber()
AsyncFileLock	tryLock()	Try to acquire a non-shared lock on the entire file.
AsyncFileLock	tryLock(long position, long size, boolean shared)	Try to acquire a lock on a portion of this file.
<T> Future<T>	withLock(long position, long size, boolean shared, Supplier<Future<T>> block)	Acquire a lock on a portion of this file.
<T> Future<T>	withLock(Supplier<Future<T>> block)	Acquire a non-shared lock on the entire file.
Future<Void>	write(Buffer data)	Write some data to the stream.
Future<Void>	write(Buffer buffer, long position)	Write a Buffer to the file at position position in the file, asynchronously.
boolean	writeQueueFull()	This will return true if there are more bytes in the write queue than the value set using setWriteQueueMaxSize(int)

Methods inherited from class java.lang.Object

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

Field Detail

__TYPE_ARG

public static final io.vertx.lang.rx.TypeArg<AsyncFile> __TYPE_ARG

Constructor Detail

AsyncFile

public AsyncFile(AsyncFile delegate)

AsyncFile

public AsyncFile(Object delegate)

Method Detail

toString

public String toString()

Overrides:

toString in class Object

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

getDelegate

public AsyncFile getDelegate()

Specified by:

getDelegate in interface ReadStream<Buffer>

Specified by:

getDelegate in interface io.vertx.lang.rx.RxDelegate

Specified by:

getDelegate in interface StreamBase

Specified by:

getDelegate in interface WriteStream<Buffer>

toObservable

public Observable<Buffer> toObservable()

Specified by:

toObservable in interface ReadStream<Buffer>

toFlowable

public Flowable<Buffer> toFlowable()

Specified by:

toFlowable in interface ReadStream<Buffer>

toObserver

public WriteStreamObserver<Buffer> toObserver()

Specified by:

toObserver in interface WriteStream<Buffer>

toSubscriber

public WriteStreamSubscriber<Buffer> toSubscriber()

Specified by:

toSubscriber in interface WriteStream<Buffer>

write

public Future<Void> write(Buffer data)

Write some data to the stream.

The data is usually put on an internal write queue, and the write actually happens asynchronously. To avoid running out of memory by putting too much on the write queue, check the WriteStream.writeQueueFull() method before writing. This is done automatically if using a .

When the data is moved from the queue to the actual medium, the returned will be completed with the write result, e.g the future is succeeded when a server HTTP response buffer is written to the socket and failed if the remote client has closed the socket while the data was still pending for write.

Specified by:

write in interface WriteStream<Buffer>

Parameters:

data - the data to write

Returns:

a future completed with the write result

rxWrite

public Completable rxWrite(Buffer data)

Write some data to the stream.

The data is usually put on an internal write queue, and the write actually happens asynchronously. To avoid running out of memory by putting too much on the write queue, check the WriteStream.writeQueueFull() method before writing. This is done automatically if using a .

When the data is moved from the queue to the actual medium, the returned will be completed with the write result, e.g the future is succeeded when a server HTTP response buffer is written to the socket and failed if the remote client has closed the socket while the data was still pending for write.

Specified by:

rxWrite in interface WriteStream<Buffer>

Parameters:

data - the data to write

Returns:

a future completed with the write result

end

public Future<Void> end()

Ends the stream.

Once the stream has ended, it cannot be used any more.

Specified by:

end in interface WriteStream<Buffer>

Returns:

a future completed with the result

rxEnd

public Completable rxEnd()

Ends the stream.

Once the stream has ended, it cannot be used any more.

Specified by:

rxEnd in interface WriteStream<Buffer>

Returns:

a future completed with the result

end

public Future<Void> end(Buffer data)

Same as WriteStream.end() but writes some data to the stream before ending.

Specified by:

end in interface WriteStream<Buffer>

Parameters:

data - the data to write

Returns:

a future completed with the result

rxEnd

public Completable rxEnd(Buffer data)

Same as WriteStream.end() but writes some data to the stream before ending.

Specified by:

rxEnd in interface WriteStream<Buffer>

Parameters:

data - the data to write

Returns:

a future completed with the result

writeQueueFull

public boolean writeQueueFull()

This will return true if there are more bytes in the write queue than the value set using setWriteQueueMaxSize(int)

Specified by:

writeQueueFull in interface WriteStream<Buffer>

Returns:

true if write queue is full

pipe

public Pipe<Buffer> pipe()

Pause this stream and return a to transfer the elements of this stream to a destination .

The stream will be resumed when the pipe will be wired to a WriteStream.

Specified by:

pipe in interface ReadStream<Buffer>

Returns:

a pipe

pipeTo

public Future<Void> pipeTo(WriteStream<Buffer> dst)

Pipe this ReadStream to the WriteStream.

Elements emitted by this stream will be written to the write stream until this stream ends or fails.

Specified by:

pipeTo in interface ReadStream<Buffer>

Parameters:

dst - the destination write stream

Returns:

a future notified when the write stream will be ended with the outcome

rxPipeTo

public Completable rxPipeTo(WriteStream<Buffer> dst)

Pipe this ReadStream to the WriteStream.

Elements emitted by this stream will be written to the write stream until this stream ends or fails.

Specified by:

rxPipeTo in interface ReadStream<Buffer>

Parameters:

dst - the destination write stream

Returns:

a future notified when the write stream will be ended with the outcome

handler

public AsyncFile handler(Handler<Buffer> handler)

Description copied from interface: ReadStream

Set a data handler. As data is read, the handler will be called with the data.

Specified by:

handler in interface ReadStream<Buffer>

Returns:

a reference to this, so the API can be used fluently

pause

public AsyncFile pause()

Description copied from interface: ReadStream

Pause the ReadStream, it sets the buffer in fetch mode and clears the actual demand.

While it's paused, no data will be sent to the data handler.

Specified by:

pause in interface ReadStream<Buffer>

Returns:

a reference to this, so the API can be used fluently

resume

public AsyncFile resume()

Description copied from interface: ReadStream

Resume reading, and sets the buffer in flowing mode.

If the ReadStream has been paused, reading will recommence on it.

Specified by:

resume in interface ReadStream<Buffer>

Returns:

a reference to this, so the API can be used fluently

endHandler

public AsyncFile endHandler(Handler<Void> endHandler)

Description copied from interface: ReadStream

Set an end handler. Once the stream has ended, and there is no more data to be read, this handler will be called.

Specified by:

endHandler in interface ReadStream<Buffer>

Returns:

a reference to this, so the API can be used fluently

setWriteQueueMaxSize

public AsyncFile setWriteQueueMaxSize(int maxSize)

Description copied from interface: WriteStream

Set the maximum size of the write queue to maxSize. You will still be able to write to the stream even if there is more than maxSize items in the write queue. This is used as an indicator by classes such as Pipe to provide flow control.

The value is defined by the implementation of the stream, e.g in bytes for a NetSocket, etc...

Specified by:

setWriteQueueMaxSize in interface WriteStream<Buffer>

Parameters:

maxSize - the max size of the write stream

Returns:

a reference to this, so the API can be used fluently

drainHandler

public AsyncFile drainHandler(Handler<Void> handler)

Description copied from interface: WriteStream

Set a drain handler on the stream. If the write queue is full, then the handler will be called when the write queue is ready to accept buffers again. See Pipe for an example of this being used.

The stream implementation defines when the drain handler, for example it could be when the queue size has been reduced to maxSize / 2.

Specified by:

drainHandler in interface WriteStream<Buffer>

Parameters:

handler - the handler

Returns:

a reference to this, so the API can be used fluently

exceptionHandler

public AsyncFile exceptionHandler(Handler<Throwable> handler)

Set an exception handler on the read stream and on the write stream.

Specified by:

exceptionHandler in interface ReadStream<Buffer>

Specified by:

exceptionHandler in interface StreamBase

Specified by:

exceptionHandler in interface WriteStream<Buffer>

Parameters:

handler - the handler

Returns:

a reference to this, so the API can be used fluently

fetch

public AsyncFile fetch(long amount)

Description copied from interface: ReadStream

Fetch the specified amount of elements. If the ReadStream has been paused, reading will recommence with the specified amount of items, otherwise the specified amount will be added to the current stream demand.

Specified by:

fetch in interface ReadStream<Buffer>

Returns:

a reference to this, so the API can be used fluently

close

public Future<Void> close()

Close the file. The actual close happens asynchronously.

Returns:

a future completed with the result

rxClose

public Completable rxClose()

Close the file. The actual close happens asynchronously.

Returns:

a future completed with the result

write

public Future<Void> write(Buffer buffer,
                          long position)

Write a Buffer to the file at position position in the file, asynchronously.

If position lies outside of the current size of the file, the file will be enlarged to encompass it.

When multiple writes are invoked on the same file there are no guarantees as to order in which those writes actually occur

Parameters:

buffer - the buffer to write

position - the position in the file to write it at

Returns:

a future notified when the write is complete

rxWrite

public Completable rxWrite(Buffer buffer,
                           long position)

Write a Buffer to the file at position position in the file, asynchronously.

If position lies outside of the current size of the file, the file will be enlarged to encompass it.

When multiple writes are invoked on the same file there are no guarantees as to order in which those writes actually occur

Parameters:

buffer - the buffer to write

position - the position in the file to write it at

Returns:

a future notified when the write is complete

read

public Future<Buffer> read(Buffer buffer,
                           int offset,
                           long position,
                           int length)

Reads length bytes of data from the file at position position in the file, asynchronously.

The read data will be written into the specified Buffer buffer at position offset.

If data is read past the end of the file then zero bytes will be read.

When multiple reads are invoked on the same file there are no guarantees as to order in which those reads actually occur.

Parameters:

buffer - the buffer to read into

offset - the offset into the buffer where the data will be read

position - the position in the file where to start reading

length - the number of bytes to read

Returns:

a future notified when the write is complete

rxRead

public Single<Buffer> rxRead(Buffer buffer,
                             int offset,
                             long position,
                             int length)

Reads length bytes of data from the file at position position in the file, asynchronously.

The read data will be written into the specified Buffer buffer at position offset.

If data is read past the end of the file then zero bytes will be read.

When multiple reads are invoked on the same file there are no guarantees as to order in which those reads actually occur.

Parameters:

buffer - the buffer to read into

offset - the offset into the buffer where the data will be read

position - the position in the file where to start reading

length - the number of bytes to read

Returns:

a future notified when the write is complete

flush

public Future<Void> flush()

Flush any writes made to this file to underlying persistent storage.

If the file was opened with flush set to true then calling this method will have no effect.

The actual flush will happen asynchronously.

Returns:

a future completed with the result

rxFlush

public Completable rxFlush()

Flush any writes made to this file to underlying persistent storage.

If the file was opened with flush set to true then calling this method will have no effect.

The actual flush will happen asynchronously.

Returns:

a future completed with the result

setReadPos

public AsyncFile setReadPos(long readPos)

Sets the position from which data will be read from when using the file as a ReadStream.

Parameters:

readPos - the position in the file

Returns:

a reference to this, so the API can be used fluently

setReadLength

public AsyncFile setReadLength(long readLength)

Sets the number of bytes that will be read when using the file as a ReadStream.

Parameters:

readLength - the bytes that will be read from the file

Returns:

a reference to this, so the API can be used fluently

getReadLength

public long getReadLength()

Returns:

the number of bytes that will be read when using the file as a ReadStream

setWritePos

public AsyncFile setWritePos(long writePos)

Sets the position from which data will be written when using the file as a WriteStream.

Parameters:

writePos - the position in the file

Returns:

a reference to this, so the API can be used fluently

getWritePos

public long getWritePos()

Returns:

the current write position the file is at

setReadBufferSize

public AsyncFile setReadBufferSize(int readBufferSize)

Sets the buffer size that will be used to read the data from the file. Changing this value will impact how much the data will be read at a time from the file system.

Parameters:

readBufferSize - the buffer size

Returns:

a reference to this, so the API can be used fluently

sizeBlocking

public long sizeBlocking()

Like size() but blocking.

Returns:

size

public Future<Long> size()

Returns:

the size of the file

rxSize

public Single<Long> rxSize()

Returns:

the size of the file

tryLock

public AsyncFileLock tryLock()

Try to acquire a non-shared lock on the entire file.

Returns:

the lock if it can be acquired immediately, otherwise null

tryLock

public AsyncFileLock tryLock(long position,
                             long size,
                             boolean shared)

Try to acquire a lock on a portion of this file.

Parameters:

position - where the region starts

size - the size of the region

shared - whether the lock should be shared

Returns:

the lock if it can be acquired immediately, otherwise null

lock

public Future<AsyncFileLock> lock()

Acquire a non-shared lock on the entire file.

Returns:

a future indicating the completion of this operation

rxLock

public Single<AsyncFileLock> rxLock()

Acquire a non-shared lock on the entire file.

Returns:

a future indicating the completion of this operation

lock

public Future<AsyncFileLock> lock(long position,
                                  long size,
                                  boolean shared)

Acquire a lock on a portion of this file.

Parameters:

position - where the region starts

size - the size of the region

shared - whether the lock should be shared

Returns:

a future indicating the completion of this operation

rxLock

public Single<AsyncFileLock> rxLock(long position,
                                    long size,
                                    boolean shared)

Acquire a lock on a portion of this file.

Parameters:

position - where the region starts

size - the size of the region

shared - whether the lock should be shared

Returns:

a future indicating the completion of this operation

withLock

public <T> Future<T> withLock(Supplier<Future<T>> block)

Acquire a non-shared lock on the entire file.

When the block is called, the lock is already acquired, it will be released when the Future returned by the block completes.

When the block fails, the lock is released and the returned future is failed with the cause of the failure.

Parameters:

block - the code block called after lock acquisition

Returns:

the future returned by the block

rxWithLock

public <T> Single<T> rxWithLock(Supplier<Future<T>> block)

Acquire a non-shared lock on the entire file.

When the block is called, the lock is already acquired, it will be released when the Future returned by the block completes.

When the block fails, the lock is released and the returned future is failed with the cause of the failure.

Parameters:

block - the code block called after lock acquisition

Returns:

the future returned by the block

withLock

public <T> Future<T> withLock(long position,
                              long size,
                              boolean shared,
                              Supplier<Future<T>> block)

Acquire a lock on a portion of this file.

When the block is called, the lock is already acquired , it will be released when the Future returned by the block completes.

When the block fails, the lock is released and the returned future is failed with the cause of the failure.

Parameters:

position - where the region starts

size - the size of the region

shared - whether the lock should be shared

block - the code block called after lock acquisition

Returns:

the future returned by the block

rxWithLock

public <T> Single<T> rxWithLock(long position,
                                long size,
                                boolean shared,
                                Supplier<Future<T>> block)

Acquire a lock on a portion of this file.

When the block is called, the lock is already acquired , it will be released when the Future returned by the block completes.

When the block fails, the lock is released and the returned future is failed with the cause of the failure.

Parameters:

position - where the region starts

size - the size of the region

shared - whether the lock should be shared

block - the code block called after lock acquisition

Returns:

the future returned by the block

newInstance

public static AsyncFile newInstance(AsyncFile arg)