1 files changed, 75 insertions, 0 deletions
diff --git a/container-search/src/main/java/com/yahoo/search/dispatch/searchcluster/Group.java b/container-search/src/main/java/com/yahoo/search/dispatch/searchcluster/Group.java
new file mode 100644
index 00000000000..01cbc5cd307
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+++ b/container-search/src/main/java/com/yahoo/search/dispatch/searchcluster/Group.java
@@ -0,0 +1,75 @@
+// Copyright 2018 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+package com.yahoo.search.dispatch.searchcluster;
+
+import com.google.common.collect.ImmutableList;
+
+import java.util.List;
+import java.util.concurrent.atomic.AtomicBoolean;
+import java.util.concurrent.atomic.AtomicLong;
+
+/**
+ * A group in a search cluster. This class is multithread safe.
+ *
+ * @author bratseth
+ * @author ollivir
+ */
+public class Group {
+
+    private final int id;
+    private final ImmutableList<Node> nodes;
+
+    private final AtomicBoolean hasSufficientCoverage = new AtomicBoolean(true);
+    private final AtomicLong activeDocuments = new AtomicLong(0);
+
+    public Group(int id, List<Node> nodes) {
+        this.id = id;
+        this.nodes = ImmutableList.copyOf(nodes);
+    }
+
+    /** Returns the unique identity of this group */
+    public int id() { return id; }
+
+    /** Returns the nodes in this group as an immutable list */
+    public ImmutableList<Node> nodes() { return nodes; }
+
+    /**
+     * Returns whether this group has sufficient active documents
+     * (compared to other groups) that is should receive traffic
+     */
+    public boolean hasSufficientCoverage() {
+        return hasSufficientCoverage.get();
+    }
+
+    void setHasSufficientCoverage(boolean sufficientCoverage) {
+        hasSufficientCoverage.lazySet(sufficientCoverage);
+    }
+
+    void aggregateActiveDocuments() {
+        long activeDocumentsInGroup = 0;
+        for (Node node : nodes) {
+            if (node.isWorking()) {
+                activeDocumentsInGroup += node.getActiveDocuments();
+            }
+        }
+        activeDocuments.set(activeDocumentsInGroup);
+
+    }
+
+    /** Returns the active documents on this node. If unknown, 0 is returned. */
+    long getActiveDocuments() {
+        return this.activeDocuments.get();
+    }
+
+    @Override
+    public String toString() { return "search group " + id; }
+
+    @Override
+    public int hashCode() { return id; }
+
+    @Override
+    public boolean equals(Object other) {
+        if (other == this) return true;
+        if (!(other instanceof Group)) return false;
+        return ((Group) other).id == this.id;
+    }
+}