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// 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 AtomicBoolean hasFullCoverage = 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);
int idx = 0;
for(var node: nodes) {
node.setPathIndex(idx);
idx++;
}
}
/** 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);
}
public int workingNodes() {
int nodesUp = 0;
for (Node node : nodes) {
if (node.isWorking()) {
nodesUp++;
}
}
return nodesUp;
}
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;
}
public boolean isFullCoverageStatusChanged(boolean hasFullCoverageNow) {
boolean previousState = hasFullCoverage.getAndSet(hasFullCoverageNow);
return previousState != hasFullCoverageNow;
}
}
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