Package org.apache.jackrabbit.oak.plugins.memory

Class MemoryNodeStore

java.lang.Object
org.apache.jackrabbit.oak.plugins.memory.MemoryNodeStore
All Implemented Interfaces:
Observable, NodeStore
public class MemoryNodeStore extends Object implements NodeStore, Observable
Basic in-memory node store implementation. Useful as a base class for more complex functionality.

  • Constructor Details

    • MemoryNodeStore

      public MemoryNodeStore(NodeState state)

    • MemoryNodeStore

      public MemoryNodeStore()

  • Method Details

    • toString

      public String toString()
      Returns a string representation the head state of this node store.
      Overrides:
      toString in class Object

    • addObserver

      public Closeable addObserver(Observer observer)
      Description copied from interface: Observable
      Register a new Observer. Clients need to call Closeable.close() to stop getting notifications on the registered observer and to free up any resources associated with the registration.
      Specified by:
      addObserver in interface Observable
      Returns:
      a Closeable instance.

    • getRoot

      public NodeState getRoot()
      Description copied from interface: NodeStore
      Returns the latest state of the tree.
      Specified by:
      getRoot in interface NodeStore
      Returns:
      root node state

    • merge

      public NodeState merge(@NotNull @NotNull NodeBuilder builder, @NotNull @NotNull CommitHook commitHook, @NotNull @NotNull CommitInfo info) throws CommitFailedException
      This implementation is equal to first rebasing the builder and then applying it to a new branch and immediately merging it back.
      Specified by:
      merge in interface NodeStore
      Parameters:
      builder - the builder whose changes to apply
      commitHook - the commit hook to apply while merging changes
      info - commit info associated with this merge operation
      Returns:
      the node state resulting from the merge.
      Throws:
      CommitFailedException
      IllegalArgumentException - if the builder is not acquired from a root state of this store

    • rebase

      public NodeState rebase(@NotNull @NotNull NodeBuilder builder)
      This implementation is equal to applying the differences between the builders base state and its head state to a fresh builder on the stores root state using ConflictAnnotatingRebaseDiff for resolving conflicts.
      Specified by:
      rebase in interface NodeStore
      Parameters:
      builder - the builder to rebase
      Returns:
      the node state resulting from the rebase.
      Throws:
      IllegalArgumentException - if the builder is not acquired from a root state of this store

    • reset

      public NodeState reset(@NotNull @NotNull NodeBuilder builder)
      This implementation is equal resetting the builder to the root of the store and returning the resulting node state from the builder.
      Specified by:
      reset in interface NodeStore
      Parameters:
      builder - the builder to reset
      Returns:
      the node state resulting from the reset.
      Throws:
      IllegalArgumentException - if the builder is not acquired from a root state of this store

    • createBlob

      public ArrayBasedBlob createBlob(InputStream inputStream) throws IOException
      Description copied from interface: NodeStore
      Create a Blob from the given input stream. The input stream is closed after this method returns.
      Specified by:
      createBlob in interface NodeStore
      Parameters:
      inputStream - The input stream for the Blob
      Returns:
      An instance of ArrayBasedBlob.
      Throws:
      IOException - If an error occurs while reading from the stream

    • getBlob

      public Blob getBlob(@NotNull @NotNull String reference)
      Description copied from interface: NodeStore
      Get a blob by its reference.
      Specified by:
      getBlob in interface NodeStore
      Parameters:
      reference - reference to the blob
      Returns:
      blob or null if the reference does not resolve to a blob.
      See Also:

    • checkpoint

      @NotNull public @NotNull String checkpoint(long lifetime, @NotNull @NotNull Map<String,String> properties)
      Description copied from interface: NodeStore
      Creates a new checkpoint of the latest root of the tree. The checkpoint remains valid for at least as long as requested and allows that state of the repository to be retrieved using the returned opaque string reference.

      The properties passed to this methods are associated with the checkpoint and can be retrieved through the NodeStore.checkpointInfo(String) method. Its semantics is entirely application specific.

      Specified by:
      checkpoint in interface NodeStore
      Parameters:
      lifetime - time (in milliseconds, > 0) that the checkpoint should remain available
      properties - properties to associate with the checkpoint
      Returns:
      string reference of this checkpoint

    • checkpoint

      @NotNull public @NotNull String checkpoint(long lifetime)
      Description copied from interface: NodeStore
      Creates a new checkpoint of the latest root of the tree. The checkpoint remains valid for at least as long as requested and allows that state of the repository to be retrieved using the returned opaque string reference.

      This method is a shortcut for NodeStore.checkpoint(long, Map) passing an empty map for its 2nd argument.

      Specified by:
      checkpoint in interface NodeStore
      Parameters:
      lifetime - time (in milliseconds, > 0) that the checkpoint should remain available
      Returns:
      string reference of this checkpoint

    • checkpointInfo

      @NotNull public @NotNull Map<String,String> checkpointInfo(@NotNull @NotNull String checkpoint)
      Description copied from interface: NodeStore
      Retrieve the properties associated with a checkpoint.
      Specified by:
      checkpointInfo in interface NodeStore
      Parameters:
      checkpoint - string reference of a checkpoint
      Returns:
      the properties associated with the checkpoint referenced by checkpoint or an empty map when there is no such checkpoint.

    • checkpoints

      @NotNull public @NotNull Iterable<String> checkpoints()
      Description copied from interface: NodeStore
      Returns all valid checkpoints. The returned Iterable provides a snapshot of valid checkpoints at the time this method is called. That is, the Iterable will not reflect checkpoints created after this method was called.

      See NodeStore.checkpoint(long, Map) for a definition of a valid checkpoint.

      Specified by:
      checkpoints in interface NodeStore
      Returns:
      valid checkpoints.

    • retrieve

      @Nullable public @Nullable NodeState retrieve(@NotNull @NotNull String checkpoint)
      Description copied from interface: NodeStore
      Retrieves the root node from a previously created repository checkpoint.
      Specified by:
      retrieve in interface NodeStore
      Parameters:
      checkpoint - string reference of a checkpoint
      Returns:
      the root node of the checkpoint, or null if the checkpoint is no longer available

    • release

      public boolean release(String checkpoint)
      Description copied from interface: NodeStore
      Releases the provided checkpoint. If the provided checkpoint doesn't exist this method should return true.
      Specified by:
      release in interface NodeStore
      Parameters:
      checkpoint - string reference of a checkpoint
      Returns:
      true if the checkpoint was successfully removed, or if it doesn't exist

    • listCheckpoints

      public Set<String> listCheckpoints()
      test purpose only!