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<?php
namespace Amp\ByteStream;
use Amp\Promise;
/**
* An `OutputStream` allows writing data in chunks. Writers can wait on the returned promises to feel the backpressure.
*/
interface OutputStream
{
/**
* Writes data to the stream.
*
* @param string $data Bytes to write.
*
* @return Promise Succeeds once the data has been successfully written to the stream.
*
* @throws ClosedException If the stream has already been closed.
* @throws StreamException If writing to the stream fails.
*/
public function write(string $data): Promise;
/**
* Marks the stream as no longer writable. Optionally writes a final data chunk before. Note that this is not the
* same as forcefully closing the stream. This method waits for all pending writes to complete before closing the
* stream. Socket streams implementing this interface should only close the writable side of the stream.
*
* @param string $finalData Bytes to write.
*
* @return Promise Succeeds once the data has been successfully written to the stream.
*
* @throws ClosedException If the stream has already been closed.
* @throws StreamException If writing to the stream fails.
*/
public function end(string $finalData = ""): Promise;
}