okio

Interface Sink

All Superinterfaces:

AutoCloseable, Closeable, Flushable

All Known Subinterfaces:

BufferedSink

All Known Implementing Classes:

Buffer, DeflaterSink, ForwardingSink, GzipSink, RetryableSink

public interface Sink
extends Closeable, Flushable

Receives a stream of bytes. Use this interface to write data wherever it's needed: to the network, storage, or a buffer in memory. Sinks may be layered to transform received data, such as to compress, encrypt, throttle, or add protocol framing.

Most application code shouldn't operate on a sink directly, but rather BufferedSink which is both more efficient and more convenient. Use Okio.buffer(Sink) to wrap any sink with a buffer.

Sinks are easy to test: just use an Buffer in your tests, and read from it to confirm it received the data that was expected.

Comparison with OutputStream

This interface is functionally equivalent to OutputStream.

OutputStream requires multiple layers when emitted data is heterogeneous: a DataOutputStream for primitive values, a BufferedOutputStream for buffering, and OutputStreamWriter for charset encoding. This class uses BufferedSink for all of the above.

Sink is also easier to layer: there is no single-byte write method that is awkward to implement efficiently.

Interop with OutputStream

Use Okio.sink(java.io.OutputStream) to adapt an OutputStream to a sink. Use BufferedSink.outputStream() to adapt a sink to an OutputStream.

Method Summary

Modifier and Type	Method and Description
void	close() Pushes all buffered bytes to their final destination and releases the resources held by this sink.
void	flush() Pushes all buffered bytes to their final destination.
Timeout	timeout() Returns the timeout for this sink.
void	write(Buffer source, long byteCount) Removes byteCount bytes from source and appends them to this.

Method Detail

write

void write(Buffer source,
           long byteCount)
    throws IOException

Removes byteCount bytes from source and appends them to this.

Throws:

IOException

flush

void flush()
    throws IOException

Pushes all buffered bytes to their final destination.

Specified by:

flush in interface Flushable

Throws:

IOException - if there are any issues writing the data.

timeout

Timeout timeout()

Returns the timeout for this sink.

close

void close()
    throws IOException

Pushes all buffered bytes to their final destination and releases the resources held by this sink. It is an error to write a closed sink. It is safe to close a sink more than once.

Specified by:

close in interface AutoCloseable

Specified by:

close in interface Closeable

Throws:

IOException