Module io.github.bucket4j.core
Package io.github.bucket4j

Enum TokensInheritanceStrategy

    • Enum Constant Detail

      • PROPORTIONALLY

        public static final TokensInheritanceStrategy PROPORTIONALLY
        Makes to copy available tokens proportional to bandwidth capacity by following formula: newAvailableTokens = availableTokensBeforeReplacement * (newBandwidthCapacity / capacityBeforeReplacement)

        Let's describe few examples.

        Example 1: imagine bandwidth that was created by Bandwidth.classic(100, Refill.gready(10, Duration.ofMinutes(1))). At the moment of config replacement it was 40 available tokens. After replacing this bandwidth by following Bandwidth.classic(200, Refill.gready(10, Duration.ofMinutes(1))) 40 available tokens will be multiplied by 2(200/100), and after replacement we will have 80 available tokens.

        Example 2: imagine bandwidth that was created by Bandwidth.classic(100, Refill.gready(10, Duration.ofMinutes(1))). At the moment of config replacement it was 40 available tokens. After replacing this bandwidth by following Bandwidth.classic(20, Refill.gready(10, Duration.ofMinutes(1))) 40 available tokens will be multiplied by 0.2(20/100), and after replacement we will have 8 available tokens.

      • AS_IS

        public static final TokensInheritanceStrategy AS_IS
        Instructs to copy available tokens as is, but with one exclusion: if available tokens is greater than new capacity, available tokens will be decreased to new capacity.

        Let's describe few examples.

        Example 1: imagine bandwidth that was created by Bandwidth.classic(100, Refill.gready(10, Duration.ofMinutes(1))). At the moment of config replacement it was 40 available tokens. After replacing this bandwidth by following Bandwidth.classic(200, Refill.gready(10, Duration.ofMinutes(1))) 40 available tokens will be just copied, and after replacement we will have 40 available tokens.

        Example 2: imagine bandwidth that was created by Bandwidth.classic(100, Refill.gready(10, Duration.ofMinutes(1))). At the moment of config replacement it was 40 available tokens. After replacing this bandwidth by following Bandwidth.classic(20, Refill.gready(10, Duration.ofMinutes(1))) 40 available tokens can not be copied as is, because it is greater then new capacity, so available tokens will be reduced to 20.

      • RESET

        public static final TokensInheritanceStrategy RESET
        Use this mode when you want just to forget about previous bucket state. bucket.replaceConfiguration(newConfiguration, TokensInheritanceStrategy.RESET) just erases all previous state. Using this strategy equals to removing bucket and creating again with new configuration.

      • ADDITIVE

        public static final TokensInheritanceStrategy ADDITIVE
        Instructs to copy available tokens as is, but with one exclusion: if new bandwidth capacity is greater than old capacity, available tokens will be increased by the difference between the old and the new configuration.

        The formula is newAvailableTokens = Math.min(availableTokensBeforeReplacement, newBandwidthCapacity) + Math.max(0, newBandwidthCapacity - capacityBeforeReplacement)

        Let's describe few examples.

        Example 1: imagine bandwidth that was created by Bandwidth.classic(100, Refill.gready(10, Duration.ofMinutes(1))). At the moment of configuration replacement, it was 40 available tokens. After replacing this bandwidth by following Bandwidth.classic(200, Refill.gready(10, Duration.ofMinutes(1))) 40 available tokens will be copied and added to the difference between old and new configuration, and after replacement, we will have 140 available tokens.

        Example 2: imagine bandwidth that was created by Bandwidth.classic(100, Refill.gready(10, Duration.ofMinutes(1))). At the moment of config replacement it was 40 available tokens. After replacing this bandwidth by following Bandwidth.classic(20, Refill.gready(10, Duration.ofMinutes(1)))), and after replacement we will have 20 available tokens.

        Example 3: imagine bandwidth that was created by Bandwidth.classic(100, Refill.gready(10, Duration.ofMinutes(1))). At the moment of config replacement it was 10 available tokens. After replacing this bandwidth by following Bandwidth.classic(20, Refill.gready(10, Duration.ofMinutes(1)))), and after replacement we will have 10 available tokens.

    • Method Detail

      • values

        public static TokensInheritanceStrategy[] values()
        Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows: 
        for (TokensInheritanceStrategy c : TokensInheritanceStrategy.values())
    System.out.println(c);
        Returns:
        an array containing the constants of this enum type, in the order they are declared

      • valueOf

        public static TokensInheritanceStrategy valueOf​(String name)
        Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)
        Parameters:
        name - the name of the enum constant to be returned.
        Returns:
        the enum constant with the specified name
        Throws:
        IllegalArgumentException - if this enum type has no constant with the specified name
        NullPointerException - if the argument is null

      • getId

        public byte getId()