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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,57 @@ | ||
| package org.cryptomator.cryptofs.fh; | ||
|
|
||
| import org.cryptomator.cryptofs.CryptoFileSystemScoped; | ||
| import org.cryptomator.cryptolib.api.Cryptor; | ||
|
|
||
| import javax.inject.Inject; | ||
| import java.lang.ref.WeakReference; | ||
| import java.nio.ByteBuffer; | ||
| import java.util.Optional; | ||
| import java.util.Queue; | ||
| import java.util.concurrent.ConcurrentLinkedQueue; | ||
|
|
||
| /** | ||
| * A pool of ByteBuffers for cleartext and ciphertext chunks to avoid on-heap allocation. | ||
| */ | ||
| @CryptoFileSystemScoped | ||
| public class BufferPool { | ||
|
|
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| private final int ciphertextChunkSize; | ||
| private final int cleartextChunkSize; | ||
| private final Queue<WeakReference<ByteBuffer>> ciphertextBuffers = new ConcurrentLinkedQueue<>(); | ||
| private final Queue<WeakReference<ByteBuffer>> cleartextBuffers = new ConcurrentLinkedQueue<>(); | ||
|
|
||
| @Inject | ||
| public BufferPool(Cryptor cryptor) { | ||
| this.ciphertextChunkSize = cryptor.fileContentCryptor().ciphertextChunkSize(); | ||
| this.cleartextChunkSize = cryptor.fileContentCryptor().cleartextChunkSize(); | ||
| } | ||
|
|
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| private Optional<ByteBuffer> dequeueFrom(Queue<WeakReference<ByteBuffer>> queue) { | ||
| WeakReference<ByteBuffer> ref; | ||
| while ((ref = queue.poll()) != null) { | ||
| ByteBuffer cached = ref.get(); | ||
| if (cached != null) { | ||
| cached.clear(); | ||
| return Optional.of(cached); | ||
| } | ||
| } | ||
| return Optional.empty(); | ||
| } | ||
|
|
||
| public ByteBuffer getCiphertextBuffer() { | ||
| return dequeueFrom(ciphertextBuffers).orElseGet(() -> ByteBuffer.allocate(ciphertextChunkSize)); | ||
| } | ||
|
|
||
| public ByteBuffer getCleartextBuffer() { | ||
| return dequeueFrom(cleartextBuffers).orElseGet(() -> ByteBuffer.allocate(cleartextChunkSize)); | ||
| } | ||
|
|
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| public void recycle(ByteBuffer buffer) { | ||
| if (buffer.capacity() == ciphertextChunkSize) { | ||
| ciphertextBuffers.add(new WeakReference<>(buffer)); | ||
| } else if (buffer.capacity() == cleartextChunkSize) { | ||
| cleartextBuffers.add(new WeakReference<>(buffer)); | ||
| } | ||
| } | ||
| } |
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