com.firefly.net.tcp.secure.openssl.nativelib.CleanerJava6 Maven / Gradle / Ivy
package com.firefly.net.tcp.secure.openssl.nativelib;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.nio.ByteBuffer;
/**
* Allows to free direct {@link ByteBuffer} by using Cleaner. This is encapsulated in an extra class to be able
* to use {@link PlatformDependent0} on Android without problems.
*
* For more details see #2604.
*/
final class CleanerJava6 implements Cleaner {
private static final long CLEANER_FIELD_OFFSET;
private static final Method CLEAN_METHOD;
private static final Logger logger = LoggerFactory.getLogger("firefly-system");
static {
long fieldOffset = -1;
Method clean = null;
Throwable error = null;
if (PlatformDependent0.hasUnsafe()) {
ByteBuffer direct = ByteBuffer.allocateDirect(1);
try {
Field cleanerField = direct.getClass().getDeclaredField("cleaner");
fieldOffset = PlatformDependent0.objectFieldOffset(cleanerField);
Object cleaner = PlatformDependent0.getObject(direct, fieldOffset);
clean = cleaner.getClass().getDeclaredMethod("clean");
clean.invoke(cleaner);
} catch (Throwable t) {
// We don't have ByteBuffer.cleaner().
fieldOffset = -1;
clean = null;
error = t;
}
} else {
error = new UnsupportedOperationException("sun.misc.Unsafe unavailable");
}
if (error == null) {
logger.debug("java.nio.ByteBuffer.cleaner(): available");
} else {
logger.debug("java.nio.ByteBuffer.cleaner(): unavailable", error);
}
CLEANER_FIELD_OFFSET = fieldOffset;
CLEAN_METHOD = clean;
}
static boolean isSupported() {
return CLEANER_FIELD_OFFSET != -1;
}
@Override
public void freeDirectBuffer(ByteBuffer buffer) {
if (!buffer.isDirect()) {
return;
}
try {
Object cleaner = PlatformDependent0.getObject(buffer, CLEANER_FIELD_OFFSET);
if (cleaner != null) {
CLEAN_METHOD.invoke(cleaner);
}
} catch (Throwable cause) {
PlatformDependent0.throwException(cause);
}
}
}