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package org.jvnet.hk2.component;
import java.util.Collection;
import java.util.Collections;
import java.util.concurrent.CopyOnWriteArraySet;
/**
* Default implementation of InhabitantTracker
*
* @author Jeff Trent
*
* @since 3.1
*/
/*public*/ class InhabitantTrackerImpl implements InhabitantTracker, HabitatListener {
protected final Habitat h;
protected final InhabitantTrackerContext itc;
protected Callback callback;
private boolean open;
private volatile boolean initialized;
private CopyOnWriteArraySet> matches;
public InhabitantTrackerImpl(Habitat h,
InhabitantTrackerContext itc,
Callback callback) {
this.h = h;
this.itc = itc;
this.open = true;
if (null != callback) {
checkInitializedListener();
// callback should be set last
this.callback = callback;
if (null != callback && null != matches && !matches.isEmpty() && isDone()) {
callback.updated(this, h, true);
}
}
}
@Override
public String toString() {
// need to initialize data structures / listeners for proper toString() output
checkInitializedListener();
String many;
if (matches.size() > 1) {
many = ",...";
} else {
many = "";
}
return getClass().getSimpleName() + "-" +
System.identityHashCode(this) + "(" + getInhabitant() + many + ")";
}
protected void checkInitializedListener() {
if (!initialized) {
initialized = true;
h.addHabitatListener(new HabitatListenerWeakProxy(this), itc.getClassNames());
findInitialMatches();
}
}
@SuppressWarnings("unchecked")
@Override
public Inhabitant getInhabitant() throws ComponentException {
if (!open) {
return null;
}
checkInitializedListener();
Inhabitant best = null;
Long bestSr = null;
if (null != matches) {
for (Inhabitant next : matches) {
if (null == best) {
best = next;
} else {
Long sr = Habitat.getServiceRanking(next, false);
if (null != sr) {
if (null == bestSr) {
bestSr = Habitat.getServiceRanking(best, true);
}
if (sr > bestSr) {
best = next;
bestSr = sr;
} else if (sr == bestSr) {
// favor active inhabitants over inactive ones
if (!best.isInstantiated() && next.isInstantiated()) {
best = next;
}
}
}
}
}
}
return (Inhabitant) best;
}
@SuppressWarnings("unchecked")
@Override
public Collection> getInhabitants() throws ComponentException {
checkInitializedListener();
return (null == matches) ? Collections.EMPTY_SET : Collections.unmodifiableSet(matches);
}
@Override
public void release() {
if (open) {
if (initialized) {
h.removeHabitatListener(this);
initialized = false;
}
open = false;
matches = null;
callback = null;
}
}
@Override
public boolean inhabitantChanged(EventType eventType, Habitat habitat,
Inhabitant inhabitant) {
if (open && EventType.INHABITANT_MODIFIED == eventType) {
if (null != matches && matches.contains(inhabitant)) {
InhabitantFilter filter = itc.getFilter();
if (null != filter && !filter.matches(inhabitant)) {
// stimulate a removal
updateMatched(EventType.INHABITANT_INDEX_REMOVED, inhabitant);
} else {
// at least notify of the update (a change may have occurred in ranking)
if (null != callback && isDone()) {
callback.updated(this, h, false);
}
}
} else {
// check for add
InhabitantFilter filter = itc.getFilter();
if (null != filter && filter.matches(inhabitant)) {
if (null == matches) {
matches = new CopyOnWriteArraySet>();
}
// stimulate an add
updateMatched(EventType.INHABITANT_INDEX_ADDED, inhabitant);
}
}
}
return open;
}
@Override
public boolean inhabitantIndexChanged(EventType eventType, Habitat habitat,
Inhabitant inhabitant, String index, String name, Object service) {
if (open &&
(EventType.INHABITANT_INDEX_ADDED == eventType ||
EventType.INHABITANT_INDEX_REMOVED == eventType)) {
if (itc.getClassNames().contains(index)) {
InhabitantFilter filter = itc.getFilter();
if (null == filter || filter.matches(inhabitant)) {
if (null == matches) {
matches = new CopyOnWriteArraySet>();
}
updateMatched(eventType, inhabitant);
}
}
}
return open;
}
protected void updateMatched(EventType eventType, Inhabitant inhabitant) {
boolean updated;
if (EventType.INHABITANT_INDEX_ADDED == eventType) {
updated = matches.add(inhabitant);
} else {
updated = matches.remove(inhabitant);
}
if (updated && null != callback && isDone()) {
callback.updated(this, h, false);
}
}
/**
* The tracker goes beyond traditional listeners in that it also inventories
* pre-existing inhabitants matching tracking criteria.
*/
protected void findInitialMatches() {
for (String contractName : itc.getClassNames()) {
Collection> coll =
h.getAllInhabitantsByContract(contractName);
for (Inhabitant i : coll) {
inhabitantIndexChanged(EventType.INHABITANT_INDEX_ADDED,
h, i, contractName, null, null);
}
}
}
public boolean isDone() {
Boolean presence = itc.getPresenceFlag();
if (null == presence) {
return true;
} else {
if (presence) {
return !getInhabitants().isEmpty();
} else {
return getInhabitants().isEmpty();
}
}
}
}
