Java Doc for CachedIoAdapter.java in  » Database-DBMS » db4o-6.4 » com » db4o » io » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Database DBMS » db4o 6.4 » com.db4o.io   Source Cross Reference   Class Diagram   Java Document (Java Doc)   java.lang.Object    com.db4o.io.IoAdapter       com.db4o.io.CachedIoAdapter CachedIoAdapter public class CachedIoAdapter extends IoAdapter (Code) CachedIoAdapter is an IOAdapter for random access files, which caches data for IO access. Its functionality is similar to OS cache. Example: delegateAdapter = new RandomAccessFileAdapter(); Db4o.configure().io(new CachedIoAdapter(delegateAdapter)); Constructor Summary public   CachedIoAdapter(IoAdapter ioAdapter)      Creates an instance of CachedIoAdapter with the default page size and page count. public   CachedIoAdapter(IoAdapter ioAdapter, int pageSize, int pageCount)      public   CachedIoAdapter(String path, boolean lockFile, long initialLength, boolean readOnly, IoAdapter io, int pageSize, int pageCount)      Method Summary public  void close()      public  IoAdapter delegatedIoAdapter()      public  void delete(String path)      public  boolean exists(String path)      public  long getLength()      public  IoAdapter open(String path, boolean lockFile, long initialLength, boolean readOnly)      public  int read(byte[] buffer, int length)      Reads the file into the buffer using pages from cache. public  void seek(long pos)      public  void sync()      public  void write(byte[] buffer, int length)      Constructor Detail CachedIoAdapter public CachedIoAdapter(IoAdapter ioAdapter)(Code) Creates an instance of CachedIoAdapter with the default page size and page count. Parameters:   ioAdapter - delegate IO adapter (RandomAccessFileAdapter by default) CachedIoAdapter public CachedIoAdapter(IoAdapter ioAdapter, int pageSize, int pageCount)(Code) Creates an instance of CachedIoAdapter with a custom page size and page count. Parameters:   ioAdapter - delegate IO adapter (RandomAccessFileAdapter by default) Parameters:   pageSize - cache page size Parameters:   pageCount - allocated amount of pages CachedIoAdapter public CachedIoAdapter(String path, boolean lockFile, long initialLength, boolean readOnly, IoAdapter io, int pageSize, int pageCount) throws Db4oIOException(Code) Creates an instance of CachedIoAdapter with extended parameters. Parameters:   path - database file path Parameters:   lockFile - determines if the file should be locked Parameters:   initialLength - initial file length, new writes will start from this point Parameters:   readOnly - if the file should be used in read-onlyt mode. Parameters:   io - delegate IO adapter (RandomAccessFileAdapter by default) Parameters:   pageSize - cache page size Parameters:   pageCount - allocated amount of pages Method Detail close public void close() throws Db4oIOException(Code) Flushes and closes the file delegatedIoAdapter public IoAdapter delegatedIoAdapter()(Code) delete public void delete(String path)(Code) Deletes the database file Parameters:   path - file path exists public boolean exists(String path)(Code) Checks if the file exists Parameters:   path - file path getLength public long getLength() throws Db4oIOException(Code) Returns the file length open public IoAdapter open(String path, boolean lockFile, long initialLength, boolean readOnly) throws Db4oIOException(Code) Creates and returns a new CachedIoAdapter Parameters:   path - database file path Parameters:   lockFile - determines if the file should be locked Parameters:   initialLength - initial file length, new writes will start from this point read public int read(byte[] buffer, int length) throws Db4oIOException(Code) Reads the file into the buffer using pages from cache. If the next page is not cached it will be read from the file. Parameters:   buffer - destination buffer Parameters:   length - how many bytes to read seek public void seek(long pos) throws Db4oIOException(Code) Moves the pointer to the specified file position Parameters:   pos - position within the file sync public void sync() throws Db4oIOException(Code) Flushes cache to a physical storage write public void write(byte[] buffer, int length) throws Db4oIOException(Code) Writes the buffer to cache using pages Parameters:   buffer - source buffer Parameters:   length - how many bytes to write Methods inherited from com.db4o.io.IoAdapter public void blockCopy(int oldAddress, int oldAddressOffset, int newAddress, int newAddressOffset, int length) throws Db4oIOException(Code)(Java Doc) public void blockSeek(int address) throws Db4oIOException(Code)(Java Doc) public void blockSeek(int address, int offset) throws Db4oIOException(Code)(Java Doc) public void blockSize(int blockSize)(Code)(Java Doc) public int blockSize()(Code)(Java Doc) abstract public void close() throws Db4oIOException(Code)(Java Doc) public void copy(long oldAddress, long newAddress, int length) throws Db4oIOException(Code)(Java Doc) public IoAdapter delegatedIoAdapter()(Code)(Java Doc) abstract public void delete(String path)(Code)(Java Doc) abstract public boolean exists(String path)(Code)(Java Doc) abstract public long getLength() throws Db4oIOException(Code)(Java Doc) abstract public IoAdapter open(String path, boolean lockFile, long initialLength, boolean readOnly) throws Db4oIOException(Code)(Java Doc) public int read(byte[] buffer) throws Db4oIOException(Code)(Java Doc) abstract public int read(byte[] bytes, int length) throws Db4oIOException(Code)(Java Doc) final protected long regularAddress(int blockAddress, int blockAddressOffset)(Code)(Java Doc) abstract public void seek(long pos) throws Db4oIOException(Code)(Java Doc) abstract public void sync() throws Db4oIOException(Code)(Java Doc) public void write(byte[] bytes) throws Db4oIOException(Code)(Java Doc) abstract public void write(byte[] buffer, int length) throws Db4oIOException(Code)(Java Doc) Methods inherited from java.lang.Object native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc) public boolean equals(Object obj)(Code)(Java Doc) protected void finalize() throws Throwable(Code)(Java Doc) final native public Class getClass()(Code)(Java Doc) native public int hashCode()(Code)(Java Doc) final native public void notify()(Code)(Java Doc) final native public void notifyAll()(Code)(Java Doc) public String toString()(Code)(Java Doc) final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc) final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc) final public void wait() throws InterruptedException(Code)(Java Doc)