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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.jdisc.refcount;
import com.yahoo.jdisc.ResourceReference;
import java.util.HashMap;
import java.util.Map;
/**
* Does reference counting by putting a unique key together with optional context in map
* Used if system property jdisc.debug.resources=simple/true
*
* @author baldersheim
*/
public class DebugReferencesByContextMap implements References {
private final Map<Object, Object> contextMap = new HashMap<>();
private final DestructableResource resource;
private final Reference initialReference;
private long contextId = 1;
public DebugReferencesByContextMap(DestructableResource resource, Object context) {
this.resource = resource;
Long key = 0L;
initialReference = new Reference(this, key);
contextMap.put(key, context);
}
@Override
public void release() {
initialReference.close();
}
@Override
public int referenceCount() {
synchronized (contextMap) { return contextMap.size(); }
}
@Override
public ResourceReference refer(Object context) {
synchronized (contextMap) {
if (contextMap.isEmpty()) {
throw new IllegalStateException("Object is already destroyed, no more new references may be created."
+ " State={ " + currentState() + " }");
}
Long key = contextId++;
contextMap.put(key, context != null ? context : key);
return new Reference(this, key);
}
}
private void removeRef(Long key) {
synchronized (contextMap) {
contextMap.remove(key);
if (contextMap.isEmpty()) {
resource.close();
}
}
}
@Override
public String currentState() {
synchronized (contextMap) {
return contextMap.toString();
}
}
private static class Reference extends CloseableOnce {
private final DebugReferencesByContextMap references;
private final Long key;
Reference(DebugReferencesByContextMap references, Long key) {
this.references = references;
this.key = key;
}
@Override final void onClose() { references.removeRef(key); }
@Override
final References getReferences() { return references; }
}
}
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