MemoryNodeStore ("The Adobe AEM Quickstart and Web Application.")

java.lang.Object
- org.apache.jackrabbit.oak.plugins.memory.MemoryNodeStore

All Implemented Interfaces:

Observable, NodeStore
```
public class MemoryNodeStore
extends java.lang.Object
implements NodeStore, Observable
```
Basic in-memory node store implementation. Useful as a base class for more complex functionality.

Constructor Summary

Constructors
Constructor and Description

MemoryNodeStore()

MemoryNodeStore(NodeState state)

Constructors
Constructor and Description
`MemoryNodeStore()`
`MemoryNodeStore(NodeState state)`

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`java.io.Closeable`	`addObserver(Observer observer)` Register a new `Observer`.
`java.lang.String`	`checkpoint(long lifetime)` Creates a new checkpoint of the latest root of the tree.
`java.lang.String`	`checkpoint(long lifetime, java.util.Map<java.lang.String,java.lang.String> properties)` Creates a new checkpoint of the latest root of the tree.
`java.util.Map<java.lang.String,java.lang.String>`	`checkpointInfo(java.lang.String checkpoint)` Retrieve the properties associated with a checkpoint.
`ArrayBasedBlob`	`createBlob(java.io.InputStream inputStream)` Create a `Blob` from the given input stream.
`Blob`	`getBlob(java.lang.String reference)` Get a blob by its reference.
`NodeState`	`getRoot()` Returns the latest state of the tree.
`java.util.Set<java.lang.String>`	`listCheckpoints()` test purpose only!
`NodeState`	`merge(NodeBuilder builder, CommitHook commitHook, CommitInfo info)` This implementation is equal to first rebasing the builder and then applying it to a new branch and immediately merging it back.
`NodeState`	`rebase(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.
`boolean`	`release(java.lang.String checkpoint)` Releases the provided checkpoint.
`NodeState`	`reset(NodeBuilder builder)` This implementation is equal resetting the builder to the root of the store and returning the resulting node state from the builder.
`NodeState`	`retrieve(java.lang.String checkpoint)` Retrieves the root node from a previously created repository checkpoint.
`java.lang.String`	`toString()` Returns a string representation the head state of this node store.

Methods inherited from class java.lang.Object
equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

- Constructor Detail
  - MemoryNodeStore
```
public MemoryNodeStore(NodeState state)
```
  - MemoryNodeStore
```
public MemoryNodeStore()
```
- Method Detail
  - toString
```
public java.lang.String toString()
```
    Returns a string representation the head state of this node store.
    
    Overrides:
    
    toString in class java.lang.Object
  - addObserver
```
public java.io.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(NodeBuilder builder,
                       CommitHook commitHook,
                       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
    
    java.lang.IllegalArgumentException - if the builder is not acquired from a root state of this store
  - rebase
```
public NodeState rebase(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:
    
    java.lang.IllegalArgumentException - if the builder is not acquired from a root state of this store
  - reset
```
public NodeState reset(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:
    
    java.lang.IllegalArgumentException - if the builder is not acquired from a root state of this store
  - createBlob
```
public ArrayBasedBlob createBlob(java.io.InputStream inputStream)
                          throws java.io.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:
    
    java.io.IOException - If an error occurs while reading from the stream
  - getBlob
```
public Blob getBlob(java.lang.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:
    
    Blob.getReference()
  - checkpoint
```
public java.lang.String checkpoint(long lifetime,
                                   java.util.Map<java.lang.String,java.lang.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
```
public java.lang.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
```
public java.util.Map<java.lang.String,java.lang.String> checkpointInfo(java.lang.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.
  - retrieve
```
public NodeState retrieve(java.lang.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(java.lang.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 java.util.Set<java.lang.String> listCheckpoints()
```
    test purpose only!

Class MemoryNodeStore

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

MemoryNodeStore

MemoryNodeStore

Method Detail

toString

addObserver

getRoot

merge

rebase

reset

createBlob

getBlob

checkpoint

checkpoint

checkpointInfo

retrieve

release

listCheckpoints