com.lark.oapi.okio

接口 Source

所有超级接口:

AutoCloseable, Closeable

所有已知子接口:

BufferedSource

所有已知实现类:

Buffer, ForwardingSource, GzipSource, HashingSource, InflaterSource

public interface Source
extends Closeable

Supplies a stream of bytes. Use this interface to read data from wherever it's located: from the network, storage, or a buffer in memory. Sources may be layered to transform supplied data, such as to decompress, decrypt, or remove protocol framing.

Most applications shouldn't operate on a source directly, but rather on a BufferedSource which is both more efficient and more convenient. Use Okio.buffer(Source) to wrap any source with a buffer.

Sources are easy to test: just use a Buffer in your tests, and fill it with the data your application is to read.

Comparison with InputStream

This interface is functionally equivalent to InputStream.

InputStream requires multiple layers when consumed data is heterogeneous: a DataInputStream for primitive values, a BufferedInputStream for buffering, and InputStreamReader for strings. This class uses BufferedSource for all of the above.

Source avoids the impossible-to-implement available() method. Instead callers specify how many bytes they require.

Source omits the unsafe-to-compose mark and reset state that's tracked by InputStream; instead, callers just buffer what they need.

When implementing a source, you don't need to worry about the single-byte read method that is awkward to implement efficiently and returns one of 257 possible values.

And source has a stronger skip method: BufferedSource.skip(long) won't return prematurely.

Interop with InputStream

Use Okio.source(java.io.InputStream) to adapt an InputStream to a source. Use BufferedSource.inputStream() to adapt a source to an InputStream.

方法概要

限定符和类型	方法和说明
void	close() Closes this source and releases the resources held by this source.
long	read(Buffer sink, long byteCount) Removes at least 1, and up to byteCount bytes from this and appends them to sink.
Timeout	timeout() Returns the timeout for this source.

方法详细资料

read

long read(Buffer sink,
          long byteCount)
   throws IOException

Removes at least 1, and up to byteCount bytes from this and appends them to sink. Returns the number of bytes read, or -1 if this source is exhausted.

抛出:

IOException

timeout

Timeout timeout()

Returns the timeout for this source.

close

void close()
    throws IOException

Closes this source and releases the resources held by this source. It is an error to read a closed source. It is safe to close a source more than once.

指定者:

close 在接口中 AutoCloseable

指定者:

close 在接口中 Closeable

抛出:

IOException