org.apache.directory.server.core.partition.impl.btree.mavibot

Class MavibotTable<K,V>

java.lang.Object

org.apache.directory.server.xdbm.AbstractTable<K,V>

org.apache.directory.server.core.partition.impl.btree.mavibot.MavibotTable<K,V>

All Implemented Interfaces:

Table<K,V>

Direct Known Subclasses:

MavibotMasterTable

public class MavibotTable<K,V>
extends AbstractTable<K,V>

A Mavibot Table. It extends the default Apache DS Table, when Mavibot is the underlying database.

Author:

Apache Directory Project

Field Summary

Fields

Modifier and Type	Field and Description
protected org.apache.directory.mavibot.btree.RecordManager	recordMan The used recordManager

Fields inherited from class org.apache.directory.server.xdbm.AbstractTable

allowsDuplicates, commitNumber, count, keyComparator, name, schemaManager, valueComparator

Constructor Summary

Constructors

Constructor and Description
MavibotTable(org.apache.directory.mavibot.btree.RecordManager recordMan, org.apache.directory.api.ldap.model.schema.SchemaManager schemaManager, String name, org.apache.directory.mavibot.btree.serializer.ElementSerializer<K> keySerializer, org.apache.directory.mavibot.btree.serializer.ElementSerializer<V> valueSerializer, boolean allowDuplicates) Creates a new instance of MavibotTable.
MavibotTable(org.apache.directory.mavibot.btree.RecordManager recordMan, org.apache.directory.api.ldap.model.schema.SchemaManager schemaManager, String name, org.apache.directory.mavibot.btree.serializer.ElementSerializer<K> keySerializer, org.apache.directory.mavibot.btree.serializer.ElementSerializer<V> valueSerializer, boolean allowDuplicates, int cacheSize) Creates a new instance of MavibotTable.

Method Summary

Modifier and Type	Method and Description
void	close() Closes the underlying Db of this Table.
long	count(K key) Gets the count of the number of records in this Table with a specific key: returns the number of duplicates for a key.
org.apache.directory.api.ldap.model.cursor.Cursor<org.apache.directory.api.ldap.model.cursor.Tuple<K,V>>	cursor() Creates a Cursor that traverses Tuples in a Table.
org.apache.directory.api.ldap.model.cursor.Cursor<org.apache.directory.api.ldap.model.cursor.Tuple<K,V>>	cursor(K key) Creates a Cursor that traverses Table Tuples for the same key.
V	get(K key) Gets the value of a record by key if the key exists.
protected org.apache.directory.mavibot.btree.BTree<K,V>	getBTree()
ArrayTree<V>	getDupsContainer(byte[] serialized)
long	greaterThanCount(K key) Gets the number of records greater than or equal to a key value.
boolean	has(K key) Checks to see if this table has one or more tuples with a specific key: this is exactly the same as a get call with a check to see if the returned value is null or not.
boolean	has(K key, V value) Checks to see if this table has a key with a specific value.
boolean	hasGreaterOrEqual(K key) Checks to see if this table has a record with a key greater than or equal to the key argument.
boolean	hasGreaterOrEqual(K key, V val) Checks to see if this table has a Tuple with a key equal to the key argument, yet with a value greater than or equal to the value argument provided.
boolean	hasLessOrEqual(K key) Checks to see if this table has a record with a key less than or equal to the key argument.
boolean	hasLessOrEqual(K key, V val) Checks to see if this table has a Tuple with a key equal to the key argument, yet with a value less than or equal to the value argument provided.
boolean	isDupsEnabled() Checks to see if this Table has allows for duplicate keys (a.k.a.
long	lessThanCount(K key) Gets the number of records less than or equal to a key value.
void	put(K key, V value) Puts a record into this Table.
void	remove(K key) Removes all records with a specified key from this Table.
void	remove(K key, V value) Removes a single key value pair with a specified key and value from this Table.
void	sync() Synchronizes the buffers with disk.
String	toString()
org.apache.directory.api.ldap.model.cursor.Cursor<V>	valueCursor(K key) Creates a Cursor that traverses Table values for the same key.

Methods inherited from class org.apache.directory.server.xdbm.AbstractTable

count, getKeyComparator, getName, getValueComparator

Methods inherited from class java.lang.Object

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

Field Detail

recordMan

protected org.apache.directory.mavibot.btree.RecordManager recordMan

The used recordManager

Constructor Detail

MavibotTable

public MavibotTable(org.apache.directory.mavibot.btree.RecordManager recordMan,
                    org.apache.directory.api.ldap.model.schema.SchemaManager schemaManager,
                    String name,
                    org.apache.directory.mavibot.btree.serializer.ElementSerializer<K> keySerializer,
                    org.apache.directory.mavibot.btree.serializer.ElementSerializer<V> valueSerializer,
                    boolean allowDuplicates)
             throws IOException

Creates a new instance of MavibotTable.

Parameters:

recordMan - The associated RecordManager

schemaManager - The SchemaManager

name - The Table name

keySerializer - The Key serializer

valueSerializer - The Value serializer

allowDuplicates - If the table allows duplicate values

Throws:

IOException - If the instance creation failed

MavibotTable

public MavibotTable(org.apache.directory.mavibot.btree.RecordManager recordMan,
                    org.apache.directory.api.ldap.model.schema.SchemaManager schemaManager,
                    String name,
                    org.apache.directory.mavibot.btree.serializer.ElementSerializer<K> keySerializer,
                    org.apache.directory.mavibot.btree.serializer.ElementSerializer<V> valueSerializer,
                    boolean allowDuplicates,
                    int cacheSize)
             throws IOException

Creates a new instance of MavibotTable.

Parameters:

recordMan - The associated RecordManager

schemaManager - The SchemaManager

name - The Table name

keySerializer - The Key serializer

valueSerializer - The Value serializer

allowDuplicates - If the table allows duplicate values

cacheSize - The cache size to use

Throws:

IOException - If the instance creation failed

Method Detail

isDupsEnabled

public boolean isDupsEnabled()

Checks to see if this Table has allows for duplicate keys (a.k.a. multiple values for the same key).

Returns:

true if duplicate keys are enabled, false otherwise

has

public boolean has(K key)
            throws org.apache.directory.api.ldap.model.exception.LdapException

Checks to see if this table has one or more tuples with a specific key: this is exactly the same as a get call with a check to see if the returned value is null or not.

Parameters:

key - the Object of the key to check for

Returns:

true if the key exists, false otherwise

Throws:

org.apache.directory.api.ldap.model.exception.LdapException

has

public boolean has(K key,
                   V value)
            throws org.apache.directory.api.ldap.model.exception.LdapException

Checks to see if this table has a key with a specific value.

Parameters:

key - the key to check for

value - the value to check for

Returns:

true if a record with the key and value exists, false otherwise

Throws:

org.apache.directory.api.ldap.model.exception.LdapException

hasGreaterOrEqual

public boolean hasGreaterOrEqual(K key)
                          throws Exception

Checks to see if this table has a record with a key greater than or equal to the key argument. The key argument need not exist for this call to return true. The underlying database must sort keys based on a key comparator because this method depends on key ordering.

Parameters:

key - the key to compare keys to

Returns:

true if a Tuple with a key greater than or equal to the key argument exists, false otherwise

Throws:

Exception - if there is a failure to read the underlying Db

hasLessOrEqual

public boolean hasLessOrEqual(K key)
                       throws Exception

Checks to see if this table has a record with a key less than or equal to the key argument. The key argument need not exist for this call to return true. The underlying database must sort keys based on a key comparator because this method depends on key ordering.

Parameters:

key - the key to compare keys to

Returns:

true if a Tuple with a key less than or equal to the key argument exists, false otherwise

Throws:

Exception - if there is a failure to read the underlying Db

hasGreaterOrEqual

public boolean hasGreaterOrEqual(K key,
                                 V val)
                          throws org.apache.directory.api.ldap.model.exception.LdapException

Checks to see if this table has a Tuple with a key equal to the key argument, yet with a value greater than or equal to the value argument provided. The key argument MUST exist for this call to return true and the underlying Db must allow for values of duplicate keys to be sorted. The entire basis to this method depends on the fact that tuples of the same key have values sorted according to a valid value comparator. If the table does not support duplicates then an UnsupportedOperationException is thrown.

Parameters:

key - the key

val - the value to compare values to

Returns:

true if a Tuple with a key equal to the key argument and a value greater than the value argument exists, false otherwise

Throws:

org.apache.directory.api.ldap.model.exception.LdapException

hasLessOrEqual

public boolean hasLessOrEqual(K key,
                              V val)
                       throws Exception

Checks to see if this table has a Tuple with a key equal to the key argument, yet with a value less than or equal to the value argument provided. The key argument MUST exist for this call to return true and the underlying Db must allow for values of duplicate keys to be sorted. The entire basis to this method depends on the fact that tuples of the same key have values sorted according to a valid value comparator. If the table does not support duplicates then an UnsupportedOperationException is thrown.

Parameters:

key - the key

val - the value to compare values to

Returns:

true if a Tuple with a key equal to the key argument and a value less than the value argument exists, false otherwise

Throws:

Exception - if there is a failure to read the underlying Db or if the underlying Db is not of the Btree type that allows sorted duplicate values.

get

public V get(K key)
      throws org.apache.directory.api.ldap.model.exception.LdapException

Gets the value of a record by key if the key exists. If this Table allows duplicate keys then the first key will be returned. If this Table sorts keys then the key will be the smallest key in the Table as specificed by this Table's comparator or the default bytewise lexical comparator.

Parameters:

key - the key of the record

Returns:

the value of the record with the specified key if key exists or null if no such key exists.

Throws:

org.apache.directory.api.ldap.model.exception.LdapException

put

public void put(K key,
                V value)
         throws Exception

Puts a record into this Table. Null is not allowed for keys or values and should result in an IllegalArgumentException.

Parameters:

key - the key of the record

value - the value of the record.

Throws:

Exception - if there is a failure to read or write to the underlying Db

IllegalArgumentException - if a null key or value is used

remove

public void remove(K key)
            throws Exception

Removes all records with a specified key from this Table.

Parameters:

key - the key of the records to remove

Throws:

Exception - if there is a failure to read or write to the underlying Db

remove

public void remove(K key,
                   V value)
            throws Exception

Removes a single key value pair with a specified key and value from this Table.

Parameters:

key - the key of the record to remove

value - the value of the record to remove

Throws:

Exception - if there is a failure to read or write to the underlying Db

cursor

public org.apache.directory.api.ldap.model.cursor.Cursor<org.apache.directory.api.ldap.model.cursor.Tuple<K,V>> cursor()
                                                                                                                throws org.apache.directory.api.ldap.model.exception.LdapException

Creates a Cursor that traverses Tuples in a Table.

Returns:

a Cursor over Tuples containing the key value pairs

Throws:

org.apache.directory.api.ldap.model.exception.LdapException

cursor

public org.apache.directory.api.ldap.model.cursor.Cursor<org.apache.directory.api.ldap.model.cursor.Tuple<K,V>> cursor(K key)
                                                                                                                throws org.apache.directory.api.ldap.model.exception.LdapException

Creates a Cursor that traverses Table Tuples for the same key. Only Tuples with the provided key will be returned if the key exists at all. If the key does not exist an empty Cursor is returned. The motivation behind this method is to minimize the need for callers to actively constrain Cursor operations based on the Tuples they return to a specific key. This Cursor is naturally limited to return only the tuples for the same key.

Parameters:

key - the duplicate key to return the Tuples of

Returns:

a Cursor over Tuples containing the same key

Throws:

org.apache.directory.api.ldap.model.exception.LdapException

valueCursor

public org.apache.directory.api.ldap.model.cursor.Cursor<V> valueCursor(K key)
                                                                 throws Exception

Creates a Cursor that traverses Table values for the same key. Only Tuples with the provided key will have their values returned if the key exists at all. If the key does not exist an empty Cursor is returned. The motivation behind this method is to minimize the need for callers to actively constrain Cursor operations to a specific key while removing overheads in creating new Tuples or population one that is reused to return key value pairs. This Cursor is naturally limited to return only the values for the same key.

Parameters:

key - the duplicate key to return the values of

Returns:

a Cursor over values of a key

Throws:

Exception - if there are failures accessing underlying stores

count

public long count(K key)
           throws Exception

Gets the count of the number of records in this Table with a specific key: returns the number of duplicates for a key.

Parameters:

key - the Object key to count.

Returns:

the number of duplicate records for a key.

Throws:

Exception - if there is a failure to read the underlying Db

greaterThanCount

public long greaterThanCount(K key)
                      throws Exception

Gets the number of records greater than or equal to a key value. The specific key argument provided need not exist for this call to return a non-zero value.

Parameters:

key - the key to use in comparisons

Returns:

the number of keys greater than or equal to the key

Throws:

Exception - if there is a failure to read the underlying db

lessThanCount

public long lessThanCount(K key)
                   throws Exception

Gets the number of records less than or equal to a key value. The specific key argument provided need not exist for this call to return a non-zero value.

Parameters:

key - the key to use in comparisons

Returns:

the number of keys less than or equal to the key

Throws:

Exception - if there is a failure to read the underlying db

close

public void close()
           throws Exception

Closes the underlying Db of this Table.

Throws:

Exception - on any failures

getDupsContainer

public ArrayTree<V> getDupsContainer(byte[] serialized)
                              throws IOException

Throws:

IOException

getBTree

protected org.apache.directory.mavibot.btree.BTree<K,V> getBTree()

Returns:

the underlying B-tree

sync

public void sync()
          throws IOException

Synchronizes the buffers with disk.

Throws:

IOException - if errors are encountered on the flush

toString

public String toString()

Overrides:

toString in class AbstractTable<K,V>

See Also:

Object.toString()