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 Details

    • __TYPE_ARG

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

  • Constructor Details

    • AsyncFile

      public AsyncFile(AsyncFile delegate)

    • AsyncFile

      public AsyncFile(Object delegate)

  • Method Details

    • 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>

    • 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

    • 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

    • 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>
      Parameters:
      handler -
      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>
      Parameters:
      endHandler -
      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>
      Parameters:
      amount -
      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)