1 files changed, 74 insertions, 0 deletions
diff --git a/src/main/java/derms/replica2/Resources.java b/src/main/java/derms/replica2/Resources.java
new file mode 100644
index 0000000..634e315
--- /dev/null
+++ b/src/main/java/derms/replica2/Resources.java
@@ -0,0 +1,74 @@
+package derms.replica2;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+import java.util.NoSuchElementException;
+import java.util.concurrent.ConcurrentHashMap;
+
+class Resources {
+	private Map<ResourceType, Map<ResourceID, Resource>> resources;
+
+	Resources() {
+		this.resources = new ConcurrentHashMap<ResourceType, Map<ResourceID, Resource>>();
+	}
+
+	List<Resource> borrowed(CoordinatorID borrower, ResourceType 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;
+	}
+
+	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);
+	}
+
+	Resource[] getByName(ResourceType 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);
+	}
+
+	void add(Resource r) {
+		Map<ResourceID, Resource> rids;
+		synchronized (resources) {
+			rids = resources.get(r.type);
+			if (rids == null) {
+				rids = new ConcurrentHashMap<ResourceID, Resource>();
+				resources.put(r.type, rids);
+			}
+		}
+		synchronized (rids) {
+			Resource existing = rids.get(r.id);
+			if (existing != null) {
+				existing.duration += r.duration;
+			} else {
+				rids.put(r.id, r);
+			}
+		}
+	}
+
+	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);
+	}
+}