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Shaded version of DataStax Java Driver for Apache Cassandra
package com.kenai.jffi;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
*
*/
public final class ClosureMagazine {
/** A handle to the foreign interface to keep it alive as long as this object is alive */
@SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"})
private final Foreign foreign;
/** keep a reference to the call context, to avoid GC whilst the magazine is in use */
@SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"})
private final CallContext callContext;
private final long magazineAddress;
private final AtomicBoolean disposed = new AtomicBoolean(false);
ClosureMagazine(Foreign foreign, CallContext callContext, long magazineAddress) {
this.foreign = foreign;
this.callContext = callContext;
this.magazineAddress = magazineAddress;
}
public Closure.Handle allocate(Object proxy) {
long closureAddress = foreign.closureMagazineGet(magazineAddress, proxy);
return closureAddress != 0L
? new Handle(this, closureAddress, MemoryIO.getInstance().getAddress(closureAddress))
: null;
}
public void dispose() {
if (magazineAddress != 0L && !disposed.getAndSet(true)) {
foreign.freeClosureMagazine(magazineAddress);
}
}
private static final class Handle implements Closure.Handle {
private final ClosureMagazine magazine;
private final long closureAddress, codeAddress;
private Handle(ClosureMagazine magazine, long closureAddress, long codeAddress) {
this.magazine = magazine;
this.closureAddress = closureAddress;
this.codeAddress = codeAddress;
}
public long getAddress() {
return codeAddress;
}
public void setAutoRelease(boolean autorelease) {}
public void dispose() { }
public void free() {}
}
@Override
protected void finalize() throws Throwable {
try {
if (magazineAddress != 0L && !disposed.getAndSet(true)) {
foreign.freeClosureMagazine(magazineAddress);
}
} catch (Throwable t) {
Logger.getLogger(getClass().getName()).log(Level.WARNING,
"exception when freeing " + getClass() + ": %s", t.getLocalizedMessage());
} finally {
super.finalize();
}
}
}
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