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Utils: UninitializedByteBuffer

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This commit is contained in:
Stepan Usatiuk
2025-04-29 12:43:18 +02:00
parent 1b19c77bb6
commit 854bce1627
4 changed files with 48 additions and 1 deletions
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1
dhfs-parent/dhfs-app/src/test/java/com/usatiuk/dhfsapp/integration/DhfsImage.java
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@@ -70,6 +70,7 @@ public class DhfsImage implements Future<String> {
"--add-exports", "java.base/sun.nio.ch=ALL-UNNAMED",
"--add-exports", "java.base/jdk.internal.access=ALL-UNNAMED",
"--add-opens=java.base/java.nio=ALL-UNNAMED",
"--enable-preview",
"-Ddhfs.objects.peerdiscovery.interval=1s",
"-Ddhfs.objects.invalidation.delay=100",
"-Ddhfs.objects.deletion.delay=0",

2
dhfs-parent/objects/src/main/java/com/usatiuk/objects/JObjectKeyImpl.java
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@@ -46,7 +46,7 @@ public final class JObjectKeyImpl implements JObjectKey {
synchronized (this) {
if (_bb != null) return _bb;
var bytes = value.getBytes(StandardCharsets.ISO_8859_1);
var directBb = ByteBuffer.allocateDirect(bytes.length);
var directBb = UninitializedByteBuffer.allocate(bytes.length);
directBb.put(bytes);
directBb.flip();
_bb = directBb;

2
dhfs-parent/pom.xml
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@@ -102,6 +102,7 @@
<arg>-parameters</arg>
<arg>--add-exports</arg>
<arg>java.base/jdk.internal.access=ALL-UNNAMED</arg>
<arg>--enable-preview</arg>
</compilerArgs>
</configuration>
</plugin>
@@ -119,6 +120,7 @@
--add-exports java.base/sun.nio.ch=ALL-UNNAMED
--add-exports java.base/jdk.internal.access=ALL-UNNAMED
--add-opens=java.base/java.nio=ALL-UNNAMED
--enable-preview
</argLine>
<skipTests>${skip.unit}</skipTests>
<redirectTestOutputToFile>true</redirectTestOutputToFile>

44
dhfs-parent/utils/src/main/java/com/usatiuk/utils/UninitializedByteBuffer.java Normal file
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@@ -0,0 +1,44 @@
package com.usatiuk.utils;
import java.lang.foreign.*;
import java.lang.invoke.MethodHandle;
import java.nio.ByteBuffer;
import java.util.function.Consumer;
public class UninitializedByteBuffer {
private static final Linker LINKER = Linker.nativeLinker();
private static final MethodHandle malloc = LINKER.downcallHandle(
LINKER.defaultLookup().find("malloc").orElseThrow(),
FunctionDescriptor.of(ValueLayout.ADDRESS, ValueLayout.JAVA_LONG)
);
private static final MethodHandle free = LINKER.downcallHandle(
LINKER.defaultLookup().find("free").orElseThrow(),
FunctionDescriptor.ofVoid(ValueLayout.ADDRESS)
);
public static ByteBuffer allocate(int capacity) {
UnsafeAccessor.get().getNioAccess().reserveMemory(capacity, capacity);
MemorySegment segment = null;
try {
segment = (MemorySegment) malloc.invokeExact((long) capacity);
} catch (Throwable e) {
throw new RuntimeException(e);
}
Consumer<MemorySegment> cleanup = s -> {
try {
free.invokeExact(s);
UnsafeAccessor.get().getNioAccess().unreserveMemory(capacity, capacity);
} catch (Throwable e) {
throw new RuntimeException(e);
}
};
var reint = segment.reinterpret(capacity, Arena.ofAuto(), cleanup);
return reint.asByteBuffer();
}
public static long getAddress(ByteBuffer buffer) {
return UnsafeAccessor.get().getNioAccess().getBufferAddress(buffer);
}
}