// update function, making it ready for use.
func NewFromFunc[T any](ttl time.Duration, opts Opts, update func(ctx context.Context) (T, error)) *Cache[T] {
	return &Cache[T]{
		ttl:      ttl,
		updateFn: update,
		opts:     opts,
	}
}

// InitOnce initializes the cache with a TTL and an update function. It is
// guaranteed to be called only once.
func (t *Cache[T]) InitOnce(ttl time.Duration, opts Opts, update func(ctx context.Context) (T, error)) {

import java.io.*;

public class Dfs {

    static class CacheEntry {
        long expiration;
        HashMap map;

        CacheEntry(long ttl) {
            if (ttl == 0)
                ttl = Dfs.TTL;
            expiration = System.currentTimeMillis() + ttl * 1000L;
            map = new HashMap();
        }
    }

    static LogStream log = LogStream.getInstance();

            return new String( "Referral[" +
                "version=" + version + ",size=" + size +
                ",serverType=" + serverType + ",flags=" + flags +
                ",proximity=" + proximity + ",ttl=" + ttl +
                ",pathOffset=" + pathOffset + ",altPathOffset=" + altPathOffset +
                ",nodeOffset=" + nodeOffset + ",path=" + path + ",altPath=" + altPath +
                ",node=" + node + "]" );
        }

	}
}

func saveKeyEtcdWithTTL(ctx context.Context, client *etcd.Client, key string, data []byte, ttl int64) error {
	timeoutCtx, cancel := context.WithTimeout(ctx, defaultContextTimeout)
	defer cancel()
	lease, err := client.Grant(timeoutCtx, ttl)
	if err != nil {
		return etcdErrToErr(err, client.Endpoints())
	}
	_, err = client.Put(timeoutCtx, key, string(data), etcd.WithLease(lease.ID))

    }


    /**
     * @return the altPath
     */
    public final String getAltPath () {
        return this.altPath;
    }


    /**
     * @return the ttl
     */
    public final int getTtl () {
        return this.ttl;
    }


    /**
     * @return the rpath
     */
    public final String getRpath () {
        return this.rpath;
    }


    /**

                + ",path=" + this.path + ",ttl=" + this.ttl + ",expiration=" + this.expiration + ",remain="
                + ( this.expiration - System.currentTimeMillis() ) + "]";
    }


    /**
     * @return the ttl
     */
    public long getTtl () {
        return this.ttl;
    }


    /**
     * {@inheritDoc}
     *

        return "DfsReferral[pathConsumed=" + pathConsumed +
            ",server=" + server +
            ",share=" + share +
            ",link=" + link +
            ",path=" + path +
            ",ttl=" + ttl +
            ",expiration=" + expiration +
            ",resolveHashes=" + resolveHashes + "]";
    }

				<configuration>
					<includes>
						<include>**/**Test.java</include>
					</includes>
					<systemPropertyVariables>
						<networkaddress.cache.ttl>-1</networkaddress.cache.ttl>
						<networkaddress.cache.negative.ttl>-1</networkaddress.cache.negative.ttl>
					</systemPropertyVariables>
					<properties>
						<property>
							<name>listener</name>
							<value>jcifs.tests.PrintingRunListener</value>

	Weight   int         `json:"weight,omitempty"`
	Text     string      `json:"text,omitempty"`
	Mail     bool        `json:"mail,omitempty"` // Be an MX record. Priority becomes Preference.
	TTL      uint32      `json:"ttl,omitempty"`

	// Holds info about when the entry was created first.
	CreationDate time.Time `json:"creationDate"`

	// When a SRV record with a "Host: IP-address" is added, we synthesize

                    + ",recordType=" + recordTypeString + ",recordClass="
                    + ( this.recordClass == IN ? "IN" : "0x" + Hexdump.toHexString(this.recordClass, 4) ) + ",ttl=" + this.ttl + ",rDataLength="
                    + this.rDataLength);
    }