Examples of java.nio.channels.FileChannel.force()

java.nio.channels.FileChannel.force()
Request that all updates to the channel are committed to the storage device.
When this method returns all modifications made to the platform file underlying this channel will be committed to a local storage device. If the file is not hosted locally, such as a networked file system, then applications cannot be certain that the modifications have been committed.

There are no assurances given that changes made to the file using methods defined elsewhere will be committed. For example, changes made via a mapped byte buffer may not be committed.

The metadata parameter indicated whether the update should include the file's metadata such as last modification time, last access time, etc. Note that passing true may invoke an underlying write to the operating system (if the platform is maintaining metadata such as last access time), even if the channel is opened read-only. @param metadata true if the file metadata should be flushed in addition to the file content, and false otherwise. @throws ClosedChannelException if the channel is already closed. @throws IOException some other problem occured.

        
        if(position+size > fc.size())
        {
          fc.position(position+size-1);
          fc.write(ByteBuffer.allocate(1));
          fc.force(true);
        }
          
        MappedByteBuffer buf = fc.map(MapMode.READ_WRITE, position, size);
        for(DirectByteBuffer b : buffers)
          buf.put(b.getBuffer(DirectByteBuffer.SS_FILE));

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                        synchronized(this) {
                            iosInProgress++;
                        }
                    }
                    if (!dataFactory.dataNotSyncedAtAllocation) {
                        ioChannel.force(false);
                    }
                } finally {
                    if (SanityManager.DEBUG) {
                        synchronized(this) {
                            iosInProgress--;

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            pToCreate.createNewFile();
            outStream = new FileOutputStream(pToCreate);
            final FileChannel fcout = outStream.getChannel();
            fcout.position(pLength);
            outStream.write(26); // Write EOF (not normally needed)
            fcout.force(true);
            LOGGER.debug("Creation of storage " + pToCreate.toString() + " sucessful.");
            return true;
        } catch (IOException e) {
            LOGGER.error("Exception creating storage volume " + pToCreate.getAbsolutePath() + ": " + e.getMessage(), e);
            throw e;

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        sizeDataOut.writeInt(0); // on == false
        sizeDataOut.writeInt(sizeToUse);
        sizeDataOut.writeInt(this.size[0]);
        sizeDataOut.writeInt(this.size[1]);
        sizeData.writeToChannel(fileChannel.position(offset));
        fileChannel.force(false);
    }


    /**
     * Deletes this Chunk. This simply marks the Chunk's on value to off.
     */

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        Bufferlo sizeData = new Bufferlo();
        DataOutputStream sizeDataOut = new DataOutputStream(sizeData.getOutputStream());


        sizeDataOut.writeInt(0); // on == false
        sizeData.writeToChannel(fileChannel.position(offset));
        fileChannel.force(false);
     }


    /**
     * Reads the chunk into memory.
     */

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        chunkDataOut.writeInt(valueBytesLength);
        chunkData.append(keyBytes);
        chunkData.append(valueBytes);


        chunkData.writeToChannel(fileChannel.position(offset + 16));
        fileChannel.force(false);


        // turn the written data on
        on = true;
        chunkDataOut.writeInt(1); // on == true
        chunkData.writeToChannel(fileChannel.position(offset));

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        // turn the written data on
        on = true;
        chunkDataOut.writeInt(1); // on == true
        chunkData.writeToChannel(fileChannel.position(offset));
        fileChannel.force(false);


        // clean up stuff we don't need no more
        keyBytes = null;
        valueBytes = null;
    }

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            }
            if (written <= 0 && size > 0) {
                throw new IOException("Copying to new location " + rlocFile + " failed");
            }
        } finally {
            newFc.force(true);
            newFc.close();
        }
        // delete old.idx
        fc.close();
        if (!delete()) {

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        long tCount = 0, size = c1.size();
        while ( ( tCount += c2.transferFrom( c1, 0, size - tCount ) ) < size )
            ;


        c1.close();
        c2.force( true );
        c2.close();
    }


    public static String normalizePath( String path )
    {

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      @Override
      public void flush(File f) throws IOException {
         FileChannel channel = streams.get(f.getPath());
         if (channel != null)
            channel.force(false);
      }


      @Override
      public void purge(File f) throws IOException {
         // Avoid a delete per-se because it hampers any fsync-like functionality

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