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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.service.monitor.internal;
import com.yahoo.config.model.api.ApplicationInfo;
import com.yahoo.config.model.api.SuperModel;
import com.yahoo.config.model.api.SuperModelListener;
import com.yahoo.config.model.api.SuperModelProvider;
import com.yahoo.config.provision.ApplicationId;
import com.yahoo.config.provision.Zone;
import com.yahoo.vespa.service.monitor.ServiceModel;
import java.util.List;
import java.util.function.Supplier;
import java.util.logging.Logger;
public class SuperModelListenerImpl implements SuperModelListener, Supplier<ServiceModel> {
private static final Logger logger = Logger.getLogger(SuperModelListenerImpl.class.getName());
private final ServiceMonitorMetrics metrics;
private final ModelGenerator modelGenerator;
private final Zone zone;
private final List<String> configServerHosts;
// superModel and slobrokMonitorManager are always updated together
// and atomically using this monitor.
private final Object monitor = new Object();
private final SlobrokMonitorManagerImpl slobrokMonitorManager;
private SuperModel superModel;
SuperModelListenerImpl(SlobrokMonitorManagerImpl slobrokMonitorManager,
ServiceMonitorMetrics metrics,
ModelGenerator modelGenerator,
Zone zone,
List<String> configServerHosts) {
this.slobrokMonitorManager = slobrokMonitorManager;
this.metrics = metrics;
this.modelGenerator = modelGenerator;
this.zone = zone;
this.configServerHosts = configServerHosts;
}
void start(SuperModelProvider superModelProvider) {
synchronized (monitor) {
// This snapshot() call needs to be within the synchronized block,
// since applicationActivated()/applicationRemoved() may be called
// asynchronously even before snapshot() returns.
SuperModel snapshot = superModelProvider.snapshot(this);
snapshot.getAllApplicationInfos().stream().forEach(application ->
applicationActivated(snapshot, application));
}
}
@Override
public void applicationActivated(SuperModel superModel, ApplicationInfo application) {
synchronized (monitor) {
this.superModel = superModel;
slobrokMonitorManager.applicationActivated(superModel, application);
}
}
@Override
public void applicationRemoved(SuperModel superModel, ApplicationId id) {
synchronized (monitor) {
this.superModel = superModel;
slobrokMonitorManager.applicationRemoved(superModel, id);
}
}
@Override
public ServiceModel get() {
try (LatencyMeasurement measurement = metrics.startServiceModelSnapshotLatencyMeasurement()) {
// Reference 'measurement' in a dummy statement, otherwise the compiler
// complains about "auto-closeable resource is never referenced in body of
// corresponding try statement". Why hasn't javac fixed this!?
dummy(measurement);
// WARNING: The slobrok monitor manager may be out-of-sync with super model (no locking)
return modelGenerator.toServiceModel(
superModel,
zone,
configServerHosts,
slobrokMonitorManager);
}
}
private void dummy(LatencyMeasurement measurement) {}
}
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