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## org.exist.storage.index
Class BFile

    java.lang.Object
      org.exist.storage.btree.Paged
          org.exist.storage.btree.BTree
              org.exist.storage.index.BFile

Direct Known Subclasses:
  CollectionStore

public class BFile
extends BTree

Data store for variable size values. This class maps keys to values of variable size. Keys are stored in the b+-tree. B+-tree values are pointers to the logical storage address of the value in the data section. The pointer consists of the page number and a logical tuple identifier. If a value is larger than the internal page size (4K), it is split into overflow pages. Appending data to a overflow page is very fast. Only the first and the last data page are loaded. Data pages are buffered.

Author:
  Wolfgang Meier

Nested Class Summary
`static interface` | `BFile.PageInputStream`

Nested classes inherited from class org.exist.storage.btree.Paged
`Paged.FileHeader, Paged.Page, Paged.PageHeader`

Field Summary
`static long` | `DATA_SYNC_PERIOD`
`static short` | `FILE_FORMAT_VERSION_ID`
`int` | `fixedKeyLen`
`static byte` | `FREE_LIST`
`static byte` | `LOB`
`static byte` | `LOG_CREATE_PAGE`
`static byte` | `LOG_OVERFLOW_APPEND`
`static byte` | `LOG_OVERFLOW_CREATE`
`static byte` | `LOG_OVERFLOW_CREATE_PAGE`
`static byte` | `LOG_OVERFLOW_MODIFIED`
`static byte` | `LOG_OVERFLOW_REMOVE`
`static byte` | `LOG_OVERFLOW_STORE`
`static byte` | `LOG_REMOVE_PAGE`
`static byte` | `LOG_REMOVE_VALUE`
`static byte` | `LOG_STORE_VALUE`
`static byte` | `MULTI_PAGE`
`static int` | `PAGE_MIN_FREE`
`static byte` | `RECORD`
`static long` | `UNKNOWN_ADDRESS`

Fields inherited from class org.exist.storage.btree.BTree
`KEY_NOT_FOUND, LOG_CREATE_BNODE, LOG_INSERT_VALUE, LOG_SET_PARENT, LOG_UPDATE_PAGE, LOG_UPDATE_VALUE`

Constructor Summary
`BFile(BrokerPool pool, byte fileId, boolean transactional, java.io.File file, CacheManager cacheManager, double cacheGrowth, double thresholdBTree, double thresholdData)`

Method Summary
`long` | `append(Txn transaction, Value key, ByteArray value)`
`long` | `append(Value key, ByteArray value)` Append the given data fragment to the value associated with the key.
`boolean` | `close()` Close the BFile.
`void` | `closeAndRemove()` Completely close down the instance and all underlying resources and caches.
`boolean` | `containsKey(Value key)` Check, if key is contained in BFile.
`boolean` | `create()`
`Paged.FileHeader` | `createFileHeader()` createFileHeader must be implemented by a Paged implementation in order to create an appropriate subclass instance of a FileHeader.
`Paged.FileHeader` | `createFileHeader(boolean read)` createFileHeader must be implemented by a Paged implementation in order to create an appropriate subclass instance of a FileHeader.
`Paged.FileHeader` | `createFileHeader(long pageCount)` createFileHeader must be implemented by a Paged implementation in order to create an appropriate subclass instance of a FileHeader.
`Paged.FileHeader` | `createFileHeader(long pageCount, int pageSize)` createFileHeader must be implemented by a Paged implementation in order to create an appropriate subclass instance of a FileHeader.
`Paged.PageHeader` | `createPageHeader()` createPageHeader must be implemented by a Paged implementation in order to create an appropriate subclass instance of a PageHeader.
`void` | `debugFreeList()`
`void` | `find(IndexQuery query, IndexCallback callback)`
`java.util.ArrayList` | `findEntries(IndexQuery query)`
`java.util.ArrayList` | `findKeys(IndexQuery query)`
`boolean` | `flush()`
`Value` | `get(long p)` Returns the value located at the specified address.
`Value` | `get(Value key)` Get the value data associated with the specified key or null if the key could not be found.
`VariableByteInput` | `getAsStream(long pointer)` Get the value located at the specified address as a variable byte encoded input stream.
`VariableByteInput` | `getAsStream(Value key)` Get the value data for the given key as a variable byte encoded input stream.
`BufferStats` | `getDataBufferStats()`
`java.util.ArrayList` | `getEntries()`
`short` | `getFileVersion()`
`java.util.ArrayList` | `getKeys()`
`Lock` | `getLock()` Returns the Lock object responsible for this BFile.
`java.util.ArrayList` | `getValues()`
`boolean` | `open()`
`void` | `printStatistics()`
`long` | `put(Txn transaction, Value key, byte[] data, boolean overwrite)`
`long` | `put(Txn transaction, Value key, ByteArray value, boolean overwrite)`
`long` | `put(Value key, byte[] data, boolean overwrite)` Put data under given key.
`long` | `put(Value key, ByteArray value)` Convinience method for `put(Value, byte[], boolean)`, overwrite is true.
`long` | `put(Value key, ByteArray value, boolean overwrite)` Put a value under given key.
`void` | `remove(Txn transaction, long p)`
`void` | `remove(Txn transaction, Value key)`
`void` | `remove(Value key)`
`void` | `removeAll(Txn transaction, IndexQuery query)` Remove all entries matching the given query.
`void` | `setLocation(java.lang.String location)`
`long` | `storeValue(Txn transaction, ByteArray value)`
`long` | `update(long p, Value key, ByteArray value)` Update the key/value pair found at the logical address p.
`long` | `update(Txn transaction, long p, Value key, ByteArray value)`
`long` | `update(Value key, ByteArray value)` Update a key/value pair.

Methods inherited from class org.exist.storage.btree.BTree
`addValue, addValue, dump, findValue, getIndexBufferStats, open, query, query, remove, remove, removeValue, removeValue`

Methods inherited from class org.exist.storage.btree.Paged
`backupToStream, exists, getFile, getFileHeader, getPageSize, hexDump, isOpened, isReadOnly, printFreeSpaceList, setPageSize`

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

Field Detail

### FILE_FORMAT_VERSION_ID

    public static final short FILE_FORMAT_VERSION_ID

See Also:
  Constant Field Values

### UNKNOWN_ADDRESS

    public static final long UNKNOWN_ADDRESS

See Also:
  Constant Field Values

### DATA_SYNC_PERIOD

    public static final long DATA_SYNC_PERIOD

See Also:
  Constant Field Values

### PAGE_MIN_FREE

    public static final int PAGE_MIN_FREE

See Also:
  Constant Field Values

### RECORD

    public static final byte RECORD

See Also:
  Constant Field Values

### LOB

    public static final byte LOB

See Also:
  Constant Field Values

### FREE_LIST

    public static final byte FREE_LIST

See Also:
  Constant Field Values

### MULTI_PAGE

    public static final byte MULTI_PAGE

See Also:
  Constant Field Values

### LOG_CREATE_PAGE

    public static final byte LOG_CREATE_PAGE

See Also:
  Constant Field Values

### LOG_STORE_VALUE

    public static final byte LOG_STORE_VALUE

See Also:
  Constant Field Values

### LOG_REMOVE_VALUE

    public static final byte LOG_REMOVE_VALUE

See Also:
  Constant Field Values

### LOG_REMOVE_PAGE

    public static final byte LOG_REMOVE_PAGE

See Also:
  Constant Field Values

### LOG_OVERFLOW_APPEND

    public static final byte LOG_OVERFLOW_APPEND

See Also:
  Constant Field Values

### LOG_OVERFLOW_STORE

    public static final byte LOG_OVERFLOW_STORE

See Also:
  Constant Field Values

### LOG_OVERFLOW_CREATE

    public static final byte LOG_OVERFLOW_CREATE

See Also:
  Constant Field Values

### LOG_OVERFLOW_MODIFIED

    public static final byte LOG_OVERFLOW_MODIFIED

See Also:
  Constant Field Values

### LOG_OVERFLOW_CREATE_PAGE

    public static final byte LOG_OVERFLOW_CREATE_PAGE

See Also:
  Constant Field Values

### LOG_OVERFLOW_REMOVE

    public static final byte LOG_OVERFLOW_REMOVE

See Also:
  Constant Field Values

### fixedKeyLen

    public int fixedKeyLen

Constructor Detail

### BFile

    public BFile(BrokerPool pool,
                 byte fileId,
                 boolean transactional,
                 java.io.File file,
                 CacheManager cacheManager,
                 double cacheGrowth,
                 double thresholdBTree,
                 double thresholdData)
          throws DBException

Method Detail

### getFileVersion

    public short getFileVersion()

  Overrides:
    `getFileVersion` in class `Paged`
  Returns:
    file version

### getLock

    public Lock getLock()

  Returns the Lock object responsible for this BFile.

  Returns:
    Lock

### append

    public long append(Value key,
                       ByteArray value)
                throws ReadOnlyException,
                       java.io.IOException

  Append the given data fragment to the value associated with the key. A new entry is created if the key does not yet exist in the database.

  Parameters:
    `key` -
    `value` -
  Throws:
    `ReadOnlyException`
    `java.io.IOException`

### append

    public long append(Txn transaction,
                       Value key,
                       ByteArray value)
                throws ReadOnlyException,
                       java.io.IOException

  Throws:
    `ReadOnlyException`
    `java.io.IOException`

### close

    public boolean close()
                  throws DBException

  Close the BFile.

  Overrides:
    `close` in class `BTree`
  Returns:
    always true
  Throws:
    `DBException`

### containsKey

    public boolean containsKey(Value key)

  Check, if key is contained in BFile.

  Parameters:
    `key` - key to look for
  Returns:
    true, if key exists

### create

    public boolean create()
                   throws DBException

  Overrides:
    `create` in class `Paged`
  Throws:
    `DBException`

### closeAndRemove

    public void closeAndRemove()

  Description copied from class: `Paged`
  Completely close down the instance and all underlying resources and caches.

  Overrides:
    `closeAndRemove` in class `BTree`

### createFileHeader

    public Paged.FileHeader createFileHeader()

  Description copied from class: `Paged`
  createFileHeader must be implemented by a Paged implementation in order to create an appropriate subclass instance of a FileHeader.

  Overrides:
    `createFileHeader` in class `BTree`
  See Also:
    `Paged.createFileHeader()`

### createFileHeader

    public Paged.FileHeader createFileHeader(boolean read)
                                      throws java.io.IOException

  Description copied from class: `Paged`
  createFileHeader must be implemented by a Paged implementation in order to create an appropriate subclass instance of a FileHeader.

  Overrides:
    `createFileHeader` in class `BTree`
  Throws:
    `java.io.IOException`
  See Also:
    `Paged.createFileHeader(boolean)`

### createFileHeader

    public Paged.FileHeader createFileHeader(long pageCount)

  Description copied from class: `Paged`
  createFileHeader must be implemented by a Paged implementation in order to create an appropriate subclass instance of a FileHeader.

  Overrides:
    `createFileHeader` in class `BTree`
  See Also:
    `Paged.createFileHeader(long)`

### createFileHeader

    public Paged.FileHeader createFileHeader(long pageCount,
                                             int pageSize)

  Description copied from class: `Paged`
  createFileHeader must be implemented by a Paged implementation in order to create an appropriate subclass instance of a FileHeader.

  Overrides:
    `createFileHeader` in class `BTree`
  See Also:
    `Paged.createFileHeader(long, int)`

### createPageHeader

    public Paged.PageHeader createPageHeader()

  Description copied from class: `Paged`
  createPageHeader must be implemented by a Paged implementation in order to create an appropriate subclass instance of a PageHeader.

  Overrides:
    `createPageHeader` in class `BTree`
  See Also:
    `Paged.createPageHeader()`

### removeAll

    public void removeAll(Txn transaction,
                          IndexQuery query)
                   throws java.io.IOException,
                          BTreeException

  Remove all entries matching the given query.

  Parameters:
    `query` -
  Throws:
    `java.io.IOException`
    `BTreeException`

### findEntries

    public java.util.ArrayList findEntries(IndexQuery query)
                                    throws java.io.IOException,
                                           BTreeException,
                                           TerminatedException

  Throws:
    `java.io.IOException`
    `BTreeException`
    `TerminatedException`

### findKeys

    public java.util.ArrayList findKeys(IndexQuery query)
                                 throws java.io.IOException,
                                        BTreeException,
                                        TerminatedException

  Throws:
    `java.io.IOException`
    `BTreeException`
    `TerminatedException`

### find

    public void find(IndexQuery query,
                     IndexCallback callback)
              throws java.io.IOException,
                     BTreeException,
                     TerminatedException

  Throws:
    `java.io.IOException`
    `BTreeException`
    `TerminatedException`

### flush

    public boolean flush()
                  throws DBException

  Overrides:
    `flush` in class `BTree`
  Throws:
    `DBException`

### getDataBufferStats

    public BufferStats getDataBufferStats()

### printStatistics

    public void printStatistics()

  Overrides:
    `printStatistics` in class `BTree`

### get

    public Value get(Value key)

  Get the value data associated with the specified key or null if the key could not be found.

  Parameters:
    `key` -

### getAsStream

    public VariableByteInput getAsStream(Value key)
                                  throws java.io.IOException

  Get the value data for the given key as a variable byte encoded input stream.

  Parameters:
    `key` -
  Throws:
    `java.io.IOException`

### getAsStream

    public VariableByteInput getAsStream(long pointer)
                                  throws java.io.IOException

  Get the value located at the specified address as a variable byte encoded input stream.

  Parameters:
    `pointer` -
  Throws:
    `java.io.IOException`

### get

    public Value get(long p)

  Returns the value located at the specified address.

  Parameters:
    `p` -
  Returns:
    value located at the specified address

### getEntries

    public java.util.ArrayList getEntries()
                                   throws java.io.IOException,
                                          BTreeException,
                                          TerminatedException

  Throws:
    `java.io.IOException`
    `BTreeException`
    `TerminatedException`

### getKeys

    public java.util.ArrayList getKeys()
                                throws java.io.IOException,
                                       BTreeException,
                                       TerminatedException

  Throws:
    `java.io.IOException`
    `BTreeException`
    `TerminatedException`

### getValues

    public java.util.ArrayList getValues()
                                  throws java.io.IOException,
                                         BTreeException,
                                         TerminatedException

  Throws:
    `java.io.IOException`
    `BTreeException`
    `TerminatedException`

### open

    public boolean open()
                 throws DBException

  Throws:
    `DBException`

### put

    public long put(Value key,
                    byte[] data,
                    boolean overwrite)
             throws ReadOnlyException

  Put data under given key.

  Parameters:
    `key` -
    `data` - the data (value) to update
    `overwrite` - overwrite if set to true, value will be overwritten if it already exists
  Returns:
    on success the address of the stored value, else UNKNOWN_ADDRESS
  Throws:
    `ReadOnlyException`
  See Also:
    `put(Value,byte[],boolean)`

### put

    public long put(Txn transaction,
                    Value key,
                    byte[] data,
                    boolean overwrite)
             throws ReadOnlyException

  Throws:
    `ReadOnlyException`

### put

    public long put(Value key,
                    ByteArray value)
             throws ReadOnlyException

  Convinience method for `put(Value, byte[], boolean)`, overwrite is true.

  Parameters:
    `key` - with which the data is updated
    `value` - value to update
  Returns:
    on success the address of the stored value, else UNKNOWN_ADDRESS
  Throws:
    `ReadOnlyException`

### put

    public long put(Value key,
                    ByteArray value,
                    boolean overwrite)
             throws ReadOnlyException

  Put a value under given key. The difference of this method and `append(Value, ByteArray)` is, that the value gets updated and not stored.

  Parameters:
    `key` - with which the data is updated
    `value` - value to update
    `overwrite` - if set to true, value will be overwritten if it already exists
  Returns:
    on success the address of the stored value, else UNKNOWN_ADDRESS
  Throws:
    `ReadOnlyException`

### put

    public long put(Txn transaction,
                    Value key,
                    ByteArray value,
                    boolean overwrite)
             throws ReadOnlyException

  Throws:
    `ReadOnlyException`

### remove

    public void remove(Value key)
                throws ReadOnlyException

  Throws:
    `ReadOnlyException`

### remove

    public void remove(Txn transaction,
                       Value key)
                throws ReadOnlyException

  Throws:
    `ReadOnlyException`

### remove

    public void remove(Txn transaction,
                       long p)
                throws ReadOnlyException

  Throws:
    `ReadOnlyException`

### setLocation

    public void setLocation(java.lang.String location)
                     throws DBException

  Throws:
    `DBException`

### storeValue

    public long storeValue(Txn transaction,
                           ByteArray value)
                    throws java.io.IOException,
                           ReadOnlyException

  Throws:
    `java.io.IOException`
    `ReadOnlyException`

### update

    public long update(Value key,
                       ByteArray value)
                throws ReadOnlyException

  Update a key/value pair.

  Parameters:
    `key` - Description of the Parameter
    `value` - Description of the Parameter
  Returns:
    Description of the Return Value
  Throws:
    `ReadOnlyException`

### update

    public long update(long p,
                       Value key,
                       ByteArray value)
                throws ReadOnlyException

  Update the key/value pair found at the logical address p.

  Parameters:
    `p` - Description of the Parameter
    `key` - Description of the Parameter
    `value` - Description of the Parameter
  Returns:
    Description of the Return Value
  Throws:
    `ReadOnlyException`

### update

    public long update(Txn transaction,
                       long p,
                       Value key,
                       ByteArray value)
                throws ReadOnlyException

  Throws:
    `ReadOnlyException`

### debugFreeList

    public void debugFreeList()

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Copyright (C) Wolfgang Meier. All rights reserved.