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package derms.replica.replica1;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.NoSuchElementException;
import java.util.concurrent.ConcurrentHashMap;
public class Resources {
private Map<ResourceName, Map<ResourceID, Resource>> resources;
public Resources() {
this.resources = new ConcurrentHashMap<ResourceName, Map<ResourceID, Resource>>();
}
public List<Resource> borrowed(CoordinatorID borrower, ResourceName name) {
List<Resource> borrowed = new ArrayList<Resource>();
Resource[] namedResources = getByName(name);
for (Resource r : namedResources) {
if (r.isBorrowed && r.borrower.equals(borrower)) {
borrowed.add(r);
}
}
return borrowed;
}
public Resource getByID(ResourceID id) throws NoSuchElementException {
for (Map<ResourceID, Resource> rids : resources.values()) {
Resource resource = rids.get(id);
if (resource != null) {
return resource;
}
}
throw new NoSuchElementException("No such resource "+id);
}
public Resource[] getByName(ResourceName name) {
Map<ResourceID, Resource> rids = resources.get(name);
if (rids == null) {
return new Resource[0];
}
Resource[] r = new Resource[0];
return rids.values().toArray(r);
}
public void add(Resource r) {
Map<ResourceID, Resource> rids;
synchronized (resources) {
rids = resources.get(r.name);
if (rids == null) {
rids = new ConcurrentHashMap<ResourceID, Resource>();
resources.put(r.name, rids);
}
}
synchronized (rids) {
Resource existing = rids.get(r.id);
if (existing != null) {
existing.duration += r.duration;
} else {
rids.put(r.id, r);
}
}
}
public void removeByID(ResourceID id) throws NoSuchElementException {
for (Map<ResourceID, Resource> rids : resources.values()) {
if (rids.containsKey(id)) {
rids.remove(id);
return;
}
}
throw new NoSuchElementException("No such resource "+id);
}
}
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