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POC: outbound protobuf zero-copy take 2
Variation on #7350. Slightly bigger but I think the interface changes are cleaner, avoids "borrowing" a ByteBuffer and separately informing of bytes written. Not sure which approach is preferable.
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/* | ||
* Copyright 2020 The gRPC Authors | ||
* | ||
* 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. | ||
*/ | ||
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package io.grpc; | ||
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import java.io.IOException; | ||
import java.nio.BufferOverflowException; | ||
import java.nio.ByteBuffer; | ||
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/** | ||
* Extension to an {@link java.io.InputStream} or alike by adding a method that | ||
* allows transferring directly to an underlying {@link ByteBuffer} | ||
*/ | ||
public interface BufferDrainable { | ||
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/** | ||
* Transfers all content to a target {@link ByteBuffer} | ||
* | ||
* @param dest the destination buffer to receive the bytes. | ||
* @throws BufferOverflowException if destination buffer has insufficient remaining bytes | ||
*/ | ||
int drainTo(ByteBuffer dest) throws IOException; | ||
} |
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