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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.clustercontroller.core;
import com.yahoo.vdslib.state.ClusterState;
import java.util.Map;
import java.util.Objects;
import java.util.TreeMap;
import java.util.stream.Collectors;
/**
* Represents the absolute cluster states (baseline + derived) for a given version
* as well as the relative diffs (baseline + derived) since the previous version.
*/
public class ClusterStateHistoryEntry {
public final static String BASELINE = "-";
private final long time;
private final Map<String, String> states = new TreeMap<>();
private final Map<String, String> diffs = new TreeMap<>();
ClusterStateHistoryEntry(ClusterStateBundle state, long time) {
this.time = time;
populateStateStrings(state);
// No diffs for the first entry in the history.
}
ClusterStateHistoryEntry(ClusterStateBundle state, ClusterStateBundle prevState, long time) {
this.time = time;
populateStateStrings(state);
populateDiffStrings(state, prevState);
}
private void populateStateStrings(ClusterStateBundle state) {
states.put(BASELINE, state.getBaselineClusterState().toString());
var derivedStates = state.getDerivedBucketSpaceStates().entrySet().stream()
.collect(Collectors.toMap(
entry -> entry.getKey(),
entry -> entry.getValue().getClusterState().toString()));
states.putAll(derivedStates);
}
private void populateDiffStrings(ClusterStateBundle state, ClusterStateBundle prevState) {
// Yes, it's correct to get the diff by doing old.getHtmlDifference(new) rather than the other way around.
diffs.put(BASELINE, prevState.getBaselineClusterState().getHtmlDifference(state.getBaselineClusterState()));
var spaceDiffs = state.getDerivedBucketSpaceStates().entrySet().stream()
.collect(Collectors.toMap(
entry -> entry.getKey(),
entry -> derivedStateOf(prevState, entry.getKey()).getHtmlDifference(entry.getValue().getClusterState())));
diffs.putAll(spaceDiffs);
}
public static ClusterStateHistoryEntry makeFirstEntry(ClusterStateBundle state, long time) {
return new ClusterStateHistoryEntry(state, time);
}
public static ClusterStateHistoryEntry makeSuccessor(ClusterStateBundle state, ClusterStateBundle prevState, long time) {
return new ClusterStateHistoryEntry(state, prevState, time);
}
private static ClusterState derivedStateOf(ClusterStateBundle state, String space) {
return state.getDerivedBucketSpaceStates().getOrDefault(space, AnnotatedClusterState.emptyState()).getClusterState();
}
public Map<String, String> getRawStates() {
return states;
}
public String getStateString(String space) {
return states.getOrDefault(space, "");
}
public String getDiffString(String space) {
return diffs.getOrDefault(space, "");
}
public long time() {
return time;
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
ClusterStateHistoryEntry that = (ClusterStateHistoryEntry) o;
return time == that.time &&
Objects.equals(states, that.states) &&
Objects.equals(diffs, that.diffs);
}
@Override
public int hashCode() {
return Objects.hash(time, states, diffs);
}
// String representation only used for test expectation failures and debugging output.
// Actual status page history entry rendering emits formatted date/time.
public String toString() {
return String.format("state '%s' at time %d", getStateString(BASELINE), time);
}
}
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