emit
Writes all buffered data to the underlying sink, if one exists. Like flush, but weaker. Call this before this buffered sink goes out of scope so that its data can reach its destination.
BufferedSink b0 = new Buffer();
BufferedSink b1 = Okio.buffer(b0);
BufferedSink b2 = Okio.buffer(b1);
b2.writeUtf8("hello");
assertEquals(5, b2.buffer().size());
assertEquals(0, b1.buffer().size());
assertEquals(0, b0.buffer().size());
b2.emit();
assertEquals(0, b2.buffer().size());
assertEquals(5, b1.buffer().size());
assertEquals(0, b0.buffer().size());
b1.emit();
assertEquals(0, b2.buffer().size());
assertEquals(0, b1.buffer().size());
assertEquals(5, b0.buffer().size());