Constructor Detail

• ConstantTimeToLiveExpirationPolicy

  public ConstantTimeToLiveExpirationPolicy()

  Default constructor. Constructs a policy using a negative time-to-live value that results in entries never expiring.

• ConstantTimeToLiveExpirationPolicy

  public ConstantTimeToLiveExpirationPolicy(long timeToLiveMillis)

  Construct a policy with the given time-to-live constant measured in milliseconds. A negative time-to-live value indicates entries never expire. A zero time-to-live value indicates entries expire (nearly) immediately.

  Parameters:

  timeToLiveMillis - the constant amount of time (in milliseconds) an entry is available before it expires. A negative value results in entries that NEVER expire. A zero value results in entries that ALWAYS expire.

• ConstantTimeToLiveExpirationPolicy

  public ConstantTimeToLiveExpirationPolicy(long timeToLive,
                                            TimeUnit timeUnit)

  Construct a policy with the given time-to-live constant measured in the given time unit of measure.

  Parameters:

  timeToLive - the constant amount of time an entry is available before it expires. A negative value results in entries that NEVER expire. A zero value results in entries that ALWAYS expire.

  timeUnit - the unit of time for the timeToLive parameter, must not be null.

  Throws:

  NullPointerException - if the time unit is null.

Method Detail

• expirationTime

  public long expirationTime(K key,
                             V value)

  Determine the expiration time for the given key-value entry.

  Specified by:

  expirationTime in interface  PassiveExpiringMap.ExpirationPolicy<K,V>

  Parameters:

  key - the key for the entry (ignored).

  value - the value for the entry (ignored).

  Returns:

  if timeToLiveMillis ≥ 0, an expiration time of timeToLiveMillis + System.currentTimeMillis() is returned. Otherwise, -1 is returned indicating the entry never expires.