public void testRandomReads() throws IOException {
int length = randomIntBetween(10, scaledRandomIntBetween(PAGE_SIZE * 2, PAGE_SIZE * 20));
BytesReference pbr = newBytesReference(length);
StreamInput streamInput = pbr.streamInput();
BytesRefBuilder target = new BytesRefBuilder();
while (target.length() < pbr.length()) {
switch (randomIntBetween(0, 10)) {
case 6:
case 5:
target.append(new BytesRef(new byte[] {streamInput.readByte()}));
break;
case 4:
case 3:
BytesRef bytesRef =
streamInput.readBytesRef(scaledRandomIntBetween(1, pbr.length() - target.length()));
target.append(bytesRef);
break;
default:
byte[] buffer = new byte[scaledRandomIntBetween(1, pbr.length() - target.length())];
int offset = scaledRandomIntBetween(0, buffer.length - 1);
int read = streamInput.read(buffer, offset, buffer.length - offset);
target.append(new BytesRef(buffer, offset, read));
break;
}
}
assertEquals(pbr.length(), target.length());
BytesRef targetBytes = target.get();
assertArrayEquals(
pbr.toBytes(),
Arrays.copyOfRange(targetBytes.bytes, targetBytes.offset, targetBytes.length));
}
public void testSliceStreamInput() throws IOException {
int length = randomIntBetween(10, scaledRandomIntBetween(PAGE_SIZE * 2, PAGE_SIZE * 20));
BytesReference pbr = newBytesReference(length);
// test stream input over slice (upper half of original)
int sliceOffset = randomIntBetween(1, length / 2);
int sliceLength = length - sliceOffset;
BytesReference slice = pbr.slice(sliceOffset, sliceLength);
StreamInput sliceInput = slice.streamInput();
assertEquals(sliceInput.available(), sliceLength);
// single reads
assertEquals(slice.get(0), sliceInput.readByte());
assertEquals(slice.get(1), sliceInput.readByte());
assertEquals(slice.get(2), sliceInput.readByte());
assertEquals(sliceInput.available(), sliceLength - 3);
// reset the slice stream for bulk reading
sliceInput.reset();
assertEquals(sliceInput.available(), sliceLength);
// bulk read
byte[] sliceBytes = new byte[sliceLength];
sliceInput.readFully(sliceBytes);
assertEquals(sliceInput.available(), 0);
// compare slice content with upper half of original
byte[] pbrSliceBytes = Arrays.copyOfRange(pbr.toBytes(), sliceOffset, length);
assertArrayEquals(pbrSliceBytes, sliceBytes);
// compare slice bytes with bytes read from slice via streamInput :D
byte[] sliceToBytes = slice.toBytes();
assertEquals(sliceBytes.length, sliceToBytes.length);
assertArrayEquals(sliceBytes, sliceToBytes);
sliceInput.reset();
assertEquals(sliceInput.available(), sliceLength);
byte[] buffer = new byte[sliceLength + scaledRandomIntBetween(1, 100)];
int offset = scaledRandomIntBetween(0, Math.max(1, buffer.length - sliceLength - 1));
int read = sliceInput.read(buffer, offset, sliceLength / 2);
assertEquals(sliceInput.available(), sliceLength - read);
sliceInput.read(buffer, offset + read, sliceLength - read);
assertArrayEquals(sliceBytes, Arrays.copyOfRange(buffer, offset, offset + sliceLength));
assertEquals(sliceInput.available(), 0);
}
public void testStreamInput() throws IOException {
int length = randomIntBetween(10, scaledRandomIntBetween(PAGE_SIZE * 2, PAGE_SIZE * 20));
BytesReference pbr = newBytesReference(length);
StreamInput si = pbr.streamInput();
assertNotNull(si);
// read single bytes one by one
assertEquals(pbr.get(0), si.readByte());
assertEquals(pbr.get(1), si.readByte());
assertEquals(pbr.get(2), si.readByte());
// reset the stream for bulk reading
si.reset();
// buffer for bulk reads
byte[] origBuf = new byte[length];
random().nextBytes(origBuf);
byte[] targetBuf = Arrays.copyOf(origBuf, origBuf.length);
// bulk-read 0 bytes: must not modify buffer
si.readBytes(targetBuf, 0, 0);
assertEquals(origBuf[0], targetBuf[0]);
si.reset();
// read a few few bytes as ints
int bytesToRead = randomIntBetween(1, length / 2);
for (int i = 0; i < bytesToRead; i++) {
int b = si.read();
assertEquals(pbr.get(i) & 0xff, b);
}
si.reset();
// bulk-read all
si.readFully(targetBuf);
assertArrayEquals(pbr.toBytes(), targetBuf);
// continuing to read should now fail with EOFException
try {
si.readByte();
fail("expected EOF");
} catch (EOFException | IndexOutOfBoundsException eof) {
// yay
}
// try to read more than the stream contains
si.reset();
expectThrows(IndexOutOfBoundsException.class, () -> si.readBytes(targetBuf, 0, length * 2));
}