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GrpcBlobReadChannel.java
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GrpcBlobReadChannel.java
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/*
* Copyright 2022 Google LLC
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.google.cloud.storage;
import com.google.api.gax.rpc.ServerStreamingCallable;
import com.google.cloud.ReadChannel;
import com.google.cloud.RestorableState;
import com.google.cloud.storage.GapicDownloadSessionBuilder.ReadableByteChannelSessionBuilder;
import com.google.storage.v2.Object;
import com.google.storage.v2.ReadObjectRequest;
import com.google.storage.v2.ReadObjectResponse;
import org.checkerframework.checker.nullness.qual.NonNull;
final class GrpcBlobReadChannel extends BaseStorageReadChannel<Object> {
private final ServerStreamingCallable<ReadObjectRequest, ReadObjectResponse> read;
private final ReadObjectRequest request;
private final boolean autoGzipDecompression;
GrpcBlobReadChannel(
ServerStreamingCallable<ReadObjectRequest, ReadObjectResponse> read,
ReadObjectRequest request,
boolean autoGzipDecompression) {
super(Conversions.grpc().blobInfo());
this.read = read;
this.request = request;
this.autoGzipDecompression = autoGzipDecompression;
}
@Override
public RestorableState<ReadChannel> capture() {
return GrpcStorageImpl.throwHttpJsonOnly(ReadChannel.class, "capture");
}
@Override
protected LazyReadChannel<?, Object> newLazyReadChannel() {
return new LazyReadChannel<>(
() -> {
ReadableByteChannelSessionBuilder b =
ResumableMedia.gapic()
.read()
.byteChannel(read)
.setHasher(Hasher.noop())
.setAutoGzipDecompression(autoGzipDecompression);
BufferHandle bufferHandle = getBufferHandle();
// because we're erasing the specific type of channel, we need to declare it here.
// If we don't, the compiler complains we're not returning a compliant type.
ReadableByteChannelSession<?, Object> session;
if (bufferHandle.capacity() > 0) {
session =
b.buffered(getBufferHandle()).setReadObjectRequest(getReadObjectRequest()).build();
} else {
session = b.unbuffered().setReadObjectRequest(getReadObjectRequest()).build();
}
return session;
});
}
@NonNull
private ReadObjectRequest getReadObjectRequest() {
ByteRangeSpec rangeSpec = getByteRangeSpec();
ReadObjectRequest.Builder b = request.toBuilder();
if (request.getGeneration() == 0) {
Object resolvedObject = getResolvedObject();
if (resolvedObject != null) {
b.setGeneration(resolvedObject.getGeneration());
}
}
return rangeSpec.seekReadObjectRequest(b).build();
}
}