@Test
public void testReadGenerationChanged() throws IOException {
BlobId blobId = BlobId.of(BUCKET_NAME, BLOB_NAME);
reader = new BlobReadChannel(options, blobId, EMPTY_RPC_OPTIONS);
byte[] firstResult = randomByteArray(DEFAULT_CHUNK_SIZE);
byte[] secondResult = randomByteArray(DEFAULT_CHUNK_SIZE);
ByteBuffer firstReadBuffer = ByteBuffer.allocate(DEFAULT_CHUNK_SIZE);
ByteBuffer secondReadBuffer = ByteBuffer.allocate(DEFAULT_CHUNK_SIZE);
expect(storageRpcMock.read(blobId.toPb(), EMPTY_RPC_OPTIONS, 0, DEFAULT_CHUNK_SIZE))
.andReturn(StorageRpc.Tuple.of("etag1", firstResult));
expect(
storageRpcMock.read(
blobId.toPb(), EMPTY_RPC_OPTIONS, DEFAULT_CHUNK_SIZE, DEFAULT_CHUNK_SIZE))
.andReturn(StorageRpc.Tuple.of("etag2", secondResult));
replay(storageRpcMock);
reader.read(firstReadBuffer);
try {
reader.read(secondReadBuffer);
fail("Expected ReadChannel read to throw StorageException");
} catch (StorageException ex) {
StringBuilder messageBuilder = new StringBuilder();
messageBuilder.append("Blob ").append(blobId).append(" was updated while reading");
assertEquals(messageBuilder.toString(), ex.getMessage());
}
}
@Test
public void testReadFinish() throws IOException {
reader = new BlobReadChannel(options, BLOB_ID, EMPTY_RPC_OPTIONS);
byte[] result = {};
ByteBuffer readBuffer = ByteBuffer.allocate(DEFAULT_CHUNK_SIZE);
expect(storageRpcMock.read(BLOB_ID.toPb(), EMPTY_RPC_OPTIONS, 0, DEFAULT_CHUNK_SIZE))
.andReturn(StorageRpc.Tuple.of("etag", result));
replay(storageRpcMock);
assertEquals(-1, reader.read(readBuffer));
}
@Test
public void testSaveAndRestore() throws IOException {
byte[] firstResult = randomByteArray(DEFAULT_CHUNK_SIZE);
byte[] secondResult = randomByteArray(DEFAULT_CHUNK_SIZE);
ByteBuffer firstReadBuffer = ByteBuffer.allocate(42);
ByteBuffer secondReadBuffer = ByteBuffer.allocate(DEFAULT_CHUNK_SIZE);
expect(storageRpcMock.read(BLOB_ID.toPb(), EMPTY_RPC_OPTIONS, 0, DEFAULT_CHUNK_SIZE))
.andReturn(StorageRpc.Tuple.of("etag", firstResult));
expect(storageRpcMock.read(BLOB_ID.toPb(), EMPTY_RPC_OPTIONS, 42, DEFAULT_CHUNK_SIZE))
.andReturn(StorageRpc.Tuple.of("etag", secondResult));
replay(storageRpcMock);
reader = new BlobReadChannel(options, BLOB_ID, EMPTY_RPC_OPTIONS);
reader.read(firstReadBuffer);
RestorableState<ReadChannel> readerState = reader.capture();
ReadChannel restoredReader = readerState.restore();
restoredReader.read(secondReadBuffer);
assertArrayEquals(
Arrays.copyOf(firstResult, firstReadBuffer.capacity()), firstReadBuffer.array());
assertArrayEquals(secondResult, secondReadBuffer.array());
}
@Test
public void testSeek() throws IOException {
reader = new BlobReadChannel(options, BLOB_ID, EMPTY_RPC_OPTIONS);
reader.seek(42);
byte[] result = randomByteArray(DEFAULT_CHUNK_SIZE);
ByteBuffer readBuffer = ByteBuffer.allocate(DEFAULT_CHUNK_SIZE);
expect(storageRpcMock.read(BLOB_ID.toPb(), EMPTY_RPC_OPTIONS, 42, DEFAULT_CHUNK_SIZE))
.andReturn(StorageRpc.Tuple.of("etag", result));
replay(storageRpcMock);
reader.read(readBuffer);
assertArrayEquals(result, readBuffer.array());
}
@Test
public void testReadBig() throws IOException {
reader = new BlobReadChannel(options, BLOB_ID, EMPTY_RPC_OPTIONS);
reader.chunkSize(CUSTOM_CHUNK_SIZE);
byte[] firstResult = randomByteArray(DEFAULT_CHUNK_SIZE);
byte[] secondResult = randomByteArray(DEFAULT_CHUNK_SIZE);
ByteBuffer firstReadBuffer = ByteBuffer.allocate(DEFAULT_CHUNK_SIZE);
ByteBuffer secondReadBuffer = ByteBuffer.allocate(42);
expect(storageRpcMock.read(BLOB_ID.toPb(), EMPTY_RPC_OPTIONS, 0, DEFAULT_CHUNK_SIZE))
.andReturn(StorageRpc.Tuple.of("etag", firstResult));
expect(
storageRpcMock.read(
BLOB_ID.toPb(), EMPTY_RPC_OPTIONS, DEFAULT_CHUNK_SIZE, CUSTOM_CHUNK_SIZE))
.andReturn(StorageRpc.Tuple.of("etag", secondResult));
replay(storageRpcMock);
reader.read(firstReadBuffer);
reader.read(secondReadBuffer);
assertArrayEquals(firstResult, firstReadBuffer.array());
assertArrayEquals(
Arrays.copyOf(secondResult, secondReadBuffer.capacity()), secondReadBuffer.array());
}