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## rice.p2p.aggregation
Class Moraine

    java.lang.Object
      rice.p2p.aggregation.Moraine

All Implemented Interfaces:
  VersioningPast, GCPast, Past

    public class Moraine

extends java.lang.Object
implements GCPast, VersioningPast

This Past takes 2 pasts, an old Past and a new Past. It treats the old Past as a backing store for the new Past. Pretty much it's only going to work with glacier, and maybe aggregation A Moraine is the hill of rubble (aggregate as it were) left behind at the edges of a glacier or at the end of a retreating glacier

Author:
  jstewart

Field Summary
`protected Logger` | `logger`
`protected GCPast` | `newPast`
`protected GCPast` | `oldPast`
`protected VersioningPast` | `vNewPast`
`protected VersioningPast` | `vOldPast`

Fields inherited from interface rice.p2p.past.gc.GCPast
`INFINITY_EXPIRATION`

Constructor Summary
`Moraine(GCPast newPast, GCPast oldPast)`

Method Summary
`void` | `fetch(PastContentHandle handle, Continuation command)` Retrieves the object associated with a given content handle.
`Environment` | `getEnvironment()`
`java.lang.String` | `getInstance()`
`NodeHandle` | `getLocalNodeHandle()` get the nodeHandle of the local Past node
`int` | `getReplicationFactor()` Returns the number of replicas used in this Past
`void` | `insert(PastContent obj, Continuation command)` Inserts an object with the given ID into this instance of Past.
`void` | `insert(PastContent obj, long expiration, Continuation command)` Inserts an object with the given ID into this instance of Past.
`void` | `lookup(Id id, boolean cache, Continuation command)` Retrieves the object stored in this instance of Past with the given ID.
`void` | `lookup(Id id, Continuation command)` Retrieves the object stored in this instance of Past with the given ID.
`void` | `lookup(Id id, long version, Continuation command)` Retrieves the object stored in this instance of Past with the given ID and the specified version.
`void` | `lookupHandle(Id id, NodeHandle handle, Continuation command)` Retrieves the handle for the given object stored on the requested node.
`void` | `lookupHandles(Id id, int max, Continuation command)` Retrieves the handles of up to max replicas of the object stored in this instance of Past with the given ID.
`void` | `lookupHandles(Id id, long version, int num, Continuation command)` Retrieves the handles of up to max replicas of the object stored in this instance of Past with the given ID.
`void` | `refresh(Id[] ids, long[] expirations, Continuation command)` Updates the objects stored under the provided keys id to expire no earlier than the provided expiration time.
`void` | `refresh(Id[] ids, long[] versions, long[] expirations, Continuation command)` Updates the objects stored under the provided keys id to expire no earlier than the provided expiration time.
`void` | `refresh(Id[] ids, long expiration, Continuation command)` Updates the objects stored under the provided keys id to expire no earlier than the provided expiration time.
`void` | `setContentDeserializer(PastContentDeserializer deserializer)`
`void` | `setContentHandleDeserializer(PastContentHandleDeserializer deserializer)`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### newPast

    protected GCPast newPast

### oldPast

    protected GCPast oldPast

### vNewPast

    protected VersioningPast vNewPast

### vOldPast

    protected VersioningPast vOldPast

### logger

    protected Logger logger

Constructor Detail

### Moraine

    public Moraine(GCPast newPast,
                   GCPast oldPast)

Method Detail

### insert

    public void insert(PastContent obj,
                       Continuation command)

  Description copied from interface: `GCPast`
  Inserts an object with the given ID into this instance of Past. Asynchronously returns a PastException to command, if the operation was unsuccessful. If the operation was successful, a Boolean[] is returned representing the responses from each of the replicas which inserted the object. This method is equivalent to insert(obj, INFINITY_EXPIRATION, command) as it inserts the object with a timeout value of infinity. This is done for simplicity, as well as backwards-compatibility for applications.

  Specified by:
    `insert` in interface `GCPast`
  Specified by:
    `insert` in interface `Past`
  Parameters:
    `obj` - the object to be inserted
    `command` - Command to be performed when the result is received

### lookup

    public void lookup(Id id,
                       Continuation command)

  Description copied from interface: `Past`
  Retrieves the object stored in this instance of Past with the given ID. Asynchronously returns a PastContent object as the result to the provided Continuation, or a PastException. This method is provided for convenience; its effect is identical to a lookupHandles() and a subsequent fetch() to the handle that is nearest in the network. The client must authenticate the object. In case of failure, an alternate replica of the object can be obtained via lookupHandles() and fetch(). This method is not safe if the object is immutable and storage nodes are not trusted. In this case, clients should used the lookUpHandles method to obtains the handles of all primary replicas and determine which replica is fresh in an application-specific manner. By default, this method attempts to cache the result locally for future use. Applications which do not desire this behavior should use the lookup(id, boolean, command) method.

  Specified by:
    `lookup` in interface `Past`
  Parameters:
    `id` - the key to be queried
    `command` - Command to be performed when the result is received

### lookup

    public void lookup(Id id,
                       boolean cache,
                       Continuation command)

  Description copied from interface: `Past`
  Retrieves the object stored in this instance of Past with the given ID. Asynchronously returns a PastContent object as the result to the provided Continuation, or a PastException. This method is provided for convenience; its effect is identical to a lookupHandles() and a subsequent fetch() to the handle that is nearest in the network. The client must authenticate the object. In case of failure, an alternate replica of the object can be obtained via lookupHandles() and fetch(). This method is not safe if the object is immutable and storage nodes are not trusted. In this case, clients should used the lookUpHandles method to obtains the handles of all primary replicas and determine which replica is fresh in an application-specific manner. This method also allows applications to specify if the result should be cached locally.

  Specified by:
    `lookup` in interface `Past`
  Parameters:
    `id` - the key to be queried
    `cache` - Whether or not the result should be cached
    `command` - Command to be performed when the result is received

### lookupHandles

    public void lookupHandles(Id id,
                              int max,
                              Continuation command)

  Description copied from interface: `Past`
  Retrieves the handles of up to max replicas of the object stored in this instance of Past with the given ID. Asynchronously returns an array of PastContentHandles as the result to the provided Continuation, or a PastException. Each replica handle is obtained from a different primary storage root for the the given key. If max exceeds the replication factor r of this Past instance, only r replicas are returned. This method will return a PastContentHandle[] array containing all of the handles.

  Specified by:
    `lookupHandles` in interface `Past`
  Parameters:
    `id` - the key to be queried
    `max` - the maximal number of replicas requested
    `command` - Command to be performed when the result is received

### lookupHandle

    public void lookupHandle(Id id,
                             NodeHandle handle,
                             Continuation command)

  Description copied from interface: `Past`
  Retrieves the handle for the given object stored on the requested node. Asynchronously returns a PostContentHandle (or null) to the provided continuation.

  Specified by:
    `lookupHandle` in interface `Past`
  Parameters:
    `id` - the key to be queried
    `handle` - The node on which the handle is requested
    `command` - Command to be performed when the result is received

### fetch

    public void fetch(PastContentHandle handle,
                      Continuation command)

  Description copied from interface: `Past`
  Retrieves the object associated with a given content handle. Asynchronously returns a PastContent object as the result to the provided Continuation, or a PastException. The client must authenticate the object. In case of failure, an alternate replica can be obtained using a different handle obtained via lookupHandles().

  Specified by:
    `fetch` in interface `Past`
  Parameters:
    `handle` - the key to be queried
    `command` - Command to be performed when the result is received

### getLocalNodeHandle

    public NodeHandle getLocalNodeHandle()

  Description copied from interface: `Past`
  get the nodeHandle of the local Past node

  Specified by:
    `getLocalNodeHandle` in interface `Past`
  Returns:
    the nodehandle

### getReplicationFactor

    public int getReplicationFactor()

  Description copied from interface: `Past`
  Returns the number of replicas used in this Past

  Specified by:
    `getReplicationFactor` in interface `Past`
  Returns:
    the number of replicas for each object

### getEnvironment

    public Environment getEnvironment()

  Specified by:
    `getEnvironment` in interface `Past`

### getInstance

    public java.lang.String getInstance()

  Specified by:
    `getInstance` in interface `Past`
  Returns:

### setContentDeserializer

    public void setContentDeserializer(PastContentDeserializer deserializer)

  Specified by:
    `setContentDeserializer` in interface `Past`

### setContentHandleDeserializer

    public void setContentHandleDeserializer(PastContentHandleDeserializer deserializer)

  Specified by:
    `setContentHandleDeserializer` in interface `Past`

### insert

    public void insert(PastContent obj,
                       long expiration,
                       Continuation command)

  Description copied from interface: `GCPast`
  Inserts an object with the given ID into this instance of Past. Asynchronously returns a PastException to command, if the operation was unsuccessful. If the operation was successful, a Boolean[] is returned representing the responses from each of the replicas which inserted the object. The contract for this method is that the provided object will be stored until the provided expiration time. Thus, if the application determines that it is still interested in this object, it must refresh the object via the refresh() method.

  Specified by:
    `insert` in interface `GCPast`
  Parameters:
    `obj` - the object to be inserted
    `expiration` - the time until which the object must be stored
    `command` - Command to be performed when the result is received

### refresh

    public void refresh(Id[] ids,
                        long[] expirations,
                        Continuation command)

  Description copied from interface: `GCPast`
  Updates the objects stored under the provided keys id to expire no earlier than the provided expiration time. Asyncroniously returns the result to the caller via the provided continuation. The result of this operation is an Object[], which is the same length as the input array of Ids. Each element in the array is either Boolean(true), representing that the refresh succeeded for the cooresponding Id, or an Exception describing why the refresh failed. Specifically, the possible exceptions which can be returned are: ObjectNotFoundException - if no object was found under the given key RefreshFailedException - if the refresh operation failed for any other reason (the getMessage() will describe the failure)

  Specified by:
    `refresh` in interface `GCPast`
    `expirations` - The time to extend the lifetime to
    `command` - Command to be performed when the result is received

### refresh

    public void refresh(Id[] ids,
                        long expiration,
                        Continuation command)

  Description copied from interface: `GCPast`
  Updates the objects stored under the provided keys id to expire no earlier than the provided expiration time. Asyncroniously returns the result to the caller via the provided continuation. The result of this operation is an Object[], which is the same length as the input array of Ids. Each element in the array is either Boolean(true), representing that the refresh succeeded for the cooresponding Id, or an Exception describing why the refresh failed. Specifically, the possible exceptions which can be returned are: ObjectNotFoundException - if no object was found under the given key RefreshFailedException - if the refresh operation failed for any other reason (the getMessage() will describe the failure)

  Specified by:
    `refresh` in interface `GCPast`
    `expiration` - The time to extend the lifetime to (applies to all keys)
    `command` - Command to be performed when the result is received

### lookup

    public void lookup(Id id,
                       long version,
                       Continuation command)

  Description copied from interface: `VersioningPast`
  Retrieves the object stored in this instance of Past with the given ID and the specified version. Asynchronously returns a PastContent object as the result to the provided Continuation, or a PastException.

  Specified by:
    `lookup` in interface `VersioningPast`
  Parameters:
    `id` - the key to be queried
    `command` - Command to be performed when the result is received

### lookupHandles

    public void lookupHandles(Id id,
                              long version,
                              int num,
                              Continuation command)

  Description copied from interface: `VersioningPast`
  Retrieves the handles of up to max replicas of the object stored in this instance of Past with the given ID. Asynchronously returns an array of PastContentHandles as the result to the provided Continuation, or a PastException. Each replica handle is obtained from a different primary storage root for the the given key. If max exceeds the replication factor r of this Past instance, only r replicas are returned. This method will return a PastContentHandle[] array containing all of the handles.

  Specified by:
    `lookupHandles` in interface `VersioningPast`
  Parameters:
    `id` - the key to be queried
    `version` - the requested version
    `command` - Command to be performed when the result is received

### refresh

    public void refresh(Id[] ids,
                        long[] versions,
                        long[] expirations,
                        Continuation command)

  Description copied from interface: `VersioningPast`
  Updates the objects stored under the provided keys id to expire no earlier than the provided expiration time. Asyncroniously returns the result to the caller via the provided continuation. The result of this operation is an Object[], which is the same length as the input array of Ids. Each element in the array is either Boolean(true), representing that the refresh succeeded for the cooresponding Id, or an Exception describing why the refresh failed. Specifically, the possible exceptions which can be returned are: ObjectNotFoundException - if no object was found under the given key RefreshFailedException - if the refresh operation failed for any other reason (the getMessage() will describe the failure)

  Specified by:
    `refresh` in interface `VersioningPast`
    `command` - Command to be performed when the result is received

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