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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.config.server.zookeeper;

import com.yahoo.config.provision.TenantName;
import com.yahoo.vespa.config.server.tenant.TenantRepository;
import com.yahoo.vespa.curator.Curator;

/**
 * A counter keeping track of session ids in an atomic fashion across multiple config servers.
 *
 * @author Ulf Lilleengen
 */
public class SessionCounter extends InitializedCounter {

    public SessionCounter(Curator curator, TenantName tenantName) {
        super(curator,
              TenantRepository.getTenantPath(tenantName).append("sessionCounter"),
              TenantRepository.getSessionsPath(tenantName));
    }

    /**
     * Atomically increment and return next session id.
     *
     * @return a new session id.
     */
    public long nextSessionId() {
        return counter.next();
    }

}