Package treapstore is a lightweight append-only in-memory key-value store built on top a treap (tree + heap) implementation.

    treapstore is specifically focused on supporting the in-memory datastore implementation at "".



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    type Collection

    type Collection struct {
    	// contains filtered or unexported fields

      Collection is a collection of Items.

      Collections belonging to read/write Store instances are, themselves, read/write. Collections belonging to Snapshot instances are read-only.

      A Collection's zero value is a valid read-only empty Collection, which is not terribly useful.

      func (*Collection) Delete

      func (c *Collection) Delete(i gtreap.Item)

        Delete deletes an item from the Collection, if such an item exists.

        func (*Collection) Get

        func (c *Collection) Get(i gtreap.Item) gtreap.Item

          Get returns the item in the Store that matches i, or nil if no such item exists.

          func (*Collection) IsReadOnly

          func (c *Collection) IsReadOnly() bool

            IsReadOnly returns true if this Collection is read-only.

            func (*Collection) Iterator

            func (c *Collection) Iterator(pivot gtreap.Item) *gtreap.Iterator

              Iterator returns an iterator over the Collection, starting at the supplied pivot item.

              func (*Collection) Max

              func (c *Collection) Max() gtreap.Item

                Max returns the largest item in the collection.

                func (*Collection) Min

                func (c *Collection) Min() gtreap.Item

                  Min returns the smallest item in the collection.

                  func (*Collection) Name

                  func (c *Collection) Name() string

                    Name returns this Collection's name.

                    func (*Collection) Put

                    func (c *Collection) Put(i gtreap.Item)

                      Put adds an item to the Store.

                      If the Store is read-only, Put will panic.

                      func (*Collection) VisitAscend

                      func (c *Collection) VisitAscend(pivot gtreap.Item, visitor gtreap.ItemVisitor)

                        VisitAscend traverses the Collection ascendingly, invoking visitor for each visited item.

                        If visitor returns false, iteration will stop prematurely.

                        VisitAscend is a more efficient traversal than using an Iterator, and is useful in times when entry-by-entry iteration is not required.

                        type Store

                        type Store struct {
                        	// contains filtered or unexported fields

                          Store is a general-purpose concurrently-accessible copy-on-write store built on top of the treap (tree + heap) implementation.

                          A Store is composed of a series of named Collection instances, each of which can hold data elements.

                          A Store is created by calling New, and is initially in a read/write mode. Derivative Stores can be created by calling a Store's Snapshot capability. These Stores will be read-only, meaning their collections and those collections' data data may only be accessed, not modified.

                          A Store's zero value is a valid read-only empty Store, but is not terribly useful.

                          func New

                          func New() *Store

                            New creates a new read/write Store.

                            func (*Store) CreateCollection

                            func (s *Store) CreateCollection(name string, compare gtreap.Compare) *Collection

                              CreateCollection returns a Collection with the specified name. If the collection already exists, or if s is read-only, CreateCollection will panic.

                              func (*Store) GetCollection

                              func (s *Store) GetCollection(name string) *Collection

                                GetCollection returns the Collection with the specified name. If no such Collection exists, GetCollection will return nil.

                                func (*Store) GetCollectionNames

                                func (s *Store) GetCollectionNames() []string

                                  GetCollectionNames returns the names of the Collections in this Store, sorted alphabetically.

                                  func (*Store) IsReadOnly

                                  func (s *Store) IsReadOnly() bool

                                    IsReadOnly returns true if this Store is read-only.

                                    func (*Store) Snapshot

                                    func (s *Store) Snapshot() *Store

                                      Snapshot creates a read-only copy of the Store and all of its Collection instances. Because a Store is copy-on-write, this is a cheap operation.

                                      Source Files