com.bigdata.sparse

Class AtomicRowDelete

java.lang.Object

com.bigdata.btree.proc.AbstractIndexProcedure<TPS>

com.bigdata.sparse.AbstractAtomicRowReadOrWrite

com.bigdata.sparse.AtomicRowDelete

All Implemented Interfaces:

IIndexProcedure<TPS>, ISimpleIndexProcedure<TPS>, IReadOnly, IRowStoreConstants, Externalizable, Serializable

public class AtomicRowDelete
extends AbstractAtomicRowReadOrWrite

Atomic delete of a logical row. All property values written will have the same timestamp. An atomic read is performed as part of the procedure so that the caller may obtain a consistent view of the post-update state of the logical row. The server-assigned timestamp written may be obtained from the returned ITPS object.

Author:

Bryan Thompson

See Also:

Serialized Form

Field Summary

Fields inherited from class com.bigdata.sparse.AbstractAtomicRowReadOrWrite

filter, fromTime, primaryKey, schema, toTime

Fields inherited from interface com.bigdata.sparse.IRowStoreConstants

AUTO_TIMESTAMP, AUTO_TIMESTAMP_UNIQUE, CURRENT_ROW, MAX_TIMESTAMP, MIN_TIMESTAMP

Constructor Summary

Constructors

Constructor and Description
AtomicRowDelete() De-serialization ctor.
AtomicRowDelete(Schema schema, Object primaryKey, long fromTime, long toTime, long writeTime, INameFilter filter) Constructor for an atomic read+delete operation.

Method Summary

Methods

Modifier and Type	Method and Description
TPS	apply(IIndex ndx) An atomic read of the matching properties is performed and those properties are then deleted atomically.
boolean	isReadOnly() Return true iff the procedure asserts that it will not write on the index.
void	readExternal(ObjectInput in)
void	writeExternal(ObjectOutput out)

Methods inherited from class com.bigdata.sparse.AbstractAtomicRowReadOrWrite

atomicRead, atomicRead, getCurrentValue

Methods inherited from class java.lang.Object

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

Constructor Detail

AtomicRowDelete

public AtomicRowDelete()

De-serialization ctor.

AtomicRowDelete

public AtomicRowDelete(Schema schema,
               Object primaryKey,
               long fromTime,
               long toTime,
               long writeTime,
               INameFilter filter)

Constructor for an atomic read+delete operation.

Parameters:

schema - The schema governing the property set.

primaryKey - The primary key for the logical row.

writeTime - The timestamp to be assigned to the property values by an atomic write -or- IRowStoreConstants.AUTO_TIMESTAMP if a timestamp will be assigned by the server -or- IRowStoreConstants.AUTO_TIMESTAMP_UNIQUE if a unique timestamp will be assigned by the server.

filter - An optional filter used to restrict the property values that will be returned.

Method Detail

isReadOnly

public final boolean isReadOnly()

Description copied from interface: IReadOnly

Return true iff the procedure asserts that it will not write on the index. When true, the procedure may be run against a view of the index that is read-only or which allows concurrent processes to read on the same index object. When false the procedure will be run against a mutable view of the index (assuming that the procedure is executed in a context that has access to a mutable index view).

apply

public TPS apply(IIndex ndx)

An atomic read of the matching properties is performed and those properties are then deleted atomically.

Parameters:

ndx - The index.

Returns:

The matching properties as read before they were deleted.

readExternal

public void readExternal(ObjectInput in)
                  throws IOException,
                         ClassNotFoundException

Specified by:

readExternal in interface Externalizable

Overrides:

readExternal in class AbstractAtomicRowReadOrWrite

Throws:

IOException

ClassNotFoundException

writeExternal

public void writeExternal(ObjectOutput out)
                   throws IOException

Specified by:

writeExternal in interface Externalizable

Overrides:

writeExternal in class AbstractAtomicRowReadOrWrite

Throws:

IOException