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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.config.server.host;
import com.google.inject.Inject;
import com.yahoo.config.provision.HostLivenessTracker;
import java.time.Clock;
import java.time.Instant;
import java.util.Map;
import java.util.Optional;
import java.util.concurrent.ConcurrentHashMap;
/**
* Keeps track of the last config request made by each hostname.
* This always remembers all requests forever since the moment is is constructed.
* This is the implementation which will be injected to components who request a HostLivenessTracker.
*
* @author bratseth
*/
public class ConfigRequestHostLivenessTracker implements HostLivenessTracker {
private final Clock clock;
private final Map<String, Instant> lastRequestFromHost = new ConcurrentHashMap<>();
@Inject
@SuppressWarnings("unused")
public ConfigRequestHostLivenessTracker() {
this(Clock.systemUTC());
}
public ConfigRequestHostLivenessTracker(Clock clock) {
this.clock = clock;
}
@Override
public void receivedRequestFrom(String hostname) {
lastRequestFromHost.put(hostname, clock.instant());
}
@Override
public Optional<Instant> lastRequestFrom(String hostname) {
return Optional.ofNullable(lastRequestFromHost.get(hostname));
}
}
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