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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package ai.vespa.metricsproxy.metric;
import java.time.Instant;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
/**
* Once a getter is called, the instance is frozen and no more metrics can be added.
*/
// TODO: remove timestamp, only used as temporary storage.
// TODO: instances of this class can probably be replaced by a simple freezable map.
public class Metrics {
private final List<Metric> metrics = new ArrayList<>();
private Instant timestamp;
private boolean isFrozen = false;
public Metrics() {
this(Instant.now());
}
public Metrics(Instant timestamp) {
this.timestamp = timestamp;
}
private void ensureNotFrozen() {
if (isFrozen) throw new IllegalStateException("Frozen Metrics cannot be modified!");
}
public Instant getTimeStamp() {
return this.timestamp;
}
/**
* Update the timestamp
*
* @param timestamp IN UTC seconds resolution
*/
public void setTimeStamp(Instant timestamp) {
ensureNotFrozen();
this.timestamp = timestamp;
}
public void add(Metric m) {
ensureNotFrozen();
this.timestamp = m.getTimeStamp();
this.metrics.add(m);
}
/** Returns the size of the metrics covered. Note that this might also contain expired metrics. */
public int size() {
return this.metrics.size();
}
public List<Metric> list() {
isFrozen = true;
return Collections.unmodifiableList(metrics);
}
@Override
public String toString() {
StringBuilder sb = new StringBuilder();
for (Metric m : metrics) {
sb.append(m.getName()).append(":").append(m.getValue()).append("\n");
}
return sb.toString();
}
}
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