Package de.otto.synapse.state

Class ChronicleMapStateRepository<V>

  • Type Parameters:
    V - The type of the event-sourced entities stored in the StateRepository
    All Implemented Interfaces:
    StateRepository<V>, java.lang.AutoCloseable
    public class ChronicleMapStateRepository<V>
extends ConcurrentMapStateRepository<V>
    A StateRepository that is using a ChronicleMap to store the event-sourced entities off the heap.

    Suitable for larger amounts of data, without problems because of garbage-collection issues because of the usage of off-heap memory.

    In order to be able to access the ConcurrentMapStateRepository.keySet() of the stored entities, this implementation is storing a copy of the keys in a separate ConcurrentSkipListSet

    • Method Summary

      Modifier and Type Method Description
      static <V> ChronicleMapStateRepository.Builder<V> builder​(java.lang.Class<V> clazz)  
      java.util.Optional<V> get​(java.lang.String key)
      Returns the optional value to which the specified key is mapped, or Optional.empty() if this repository contains no mapping for the key.
      java.util.Optional<V> put​(java.lang.String key, V value)
      Associates the specified value with the specified key in this repository.
      long size()
      Returns the number of key-value mappings in this repository.

      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

    • Method Detail

      • put

        public java.util.Optional<V> put​(java.lang.String key,
                                 V value)
        Description copied from interface: StateRepository
        Associates the specified value with the specified key in this repository. If the repository previously contained a mapping for the key, the old value is replaced by the specified value. (A repository m is said to contain a mapping for a key k if and only if m.get(k) would return a non-empty value.)
        Specified by:
        put in interface StateRepository<V>
        Overrides:
        put in class ConcurrentMapStateRepository<V>
        Parameters:
        key - key with which the specified value is to be associated
        value - value to be associated with the specified key
        Returns:
        the previous value associated with 'key', or 'Optional.empty()' if there was no mapping for 'key'

      • get

        public java.util.Optional<V> get​(java.lang.String key)
        Description copied from interface: StateRepository
        Returns the optional value to which the specified key is mapped, or Optional.empty() if this repository contains no mapping for the key.

        More formally, if this repository contains a mapping from a key k to a value v such that (key==null ? k==null : key.equals(k)), then this method returns Optional.of(v); otherwise it returns Optional.empty(). (There can be at most one such mapping.)

        Specified by:
        get in interface StateRepository<V>
        Overrides:
        get in class ConcurrentMapStateRepository<V>
        Parameters:
        key - the key whose associated value is to be returned
        Returns:
        the Optional containing the value to which the specified key is mapped, or Optional.empty() if this repository contains no mapping for the key

      • size

        public long size()
        Description copied from interface: StateRepository
        Returns the number of key-value mappings in this repository. If the repository contains more than 'Integer.MAX_VALUE' elements, returns 'Integer.MAX_VALUE'.
        Specified by:
        size in interface StateRepository<V>
        Overrides:
        size in class ConcurrentMapStateRepository<V>
        Returns:
        the number of key-value mappings in this repository