Examples of org.apache.kahadb.util.ByteSequence

org.apache.kahadb.util.ByteSequence

                public void execute(Transaction tx) throws IOException {
                    ref.set(getLast(tx));
                }
            });
            if (ref.get() != null) {
                ByteSequence bs = this.store.getPayload(ref.get().getLocation());
                result = new PListEntry(ref.get(), bs);
            }
        }
        return result;
    }

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                    public void execute(Transaction tx) throws IOException {
                        ref.set(getNext(tx, nextId));
                    }
                });
                if (ref.get() != null) {
                    ByteSequence bs = this.store.getPayload(ref.get().getLocation());
                    result = new PListEntry(ref.get(), bs);
                }
            }
        }
        return result;

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            }
        }
    }


    synchronized ByteSequence getPayload(Location location) throws IllegalStateException, IOException {
        ByteSequence result = null;
        result = this.journal.read(location);
        return result;
    }

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     * @param location
     * @return
     * @throws IOException
     */
    public JournalCommand<?> load(Location location) throws IOException {
        ByteSequence data = journal.read(location);
        DataByteArrayInputStream is = new DataByteArrayInputStream(data);
        byte readByte = is.readByte();
        KahaEntryType type = KahaEntryType.valueOf(readByte);
        if( type == null ) {
            throw new IOException("Could not load journal record. Invalid location: "+location);

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        try {
            DataByteArrayOutputStream os = new DataByteArrayOutputStream();
            os.writeInt(BATCH_CONTROL_RECORD_SIZE);
            os.writeByte(BATCH_CONTROL_RECORD_TYPE);
            os.write(BATCH_CONTROL_RECORD_MAGIC);
            ByteSequence sequence = os.toByteSequence();
            sequence.compact();
            return sequence.getData();
        } catch (IOException e) {
            throw new RuntimeException("Could not create batch control record header.");
        }
    }

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        return location;
    }


    private int findNextBatchRecord(DataFileAccessor reader, int offset) throws IOException {
        ByteSequence header = new ByteSequence(BATCH_CONTROL_RECORD_HEADER);
        byte data[] = new byte[1024*4];
        ByteSequence bs = new ByteSequence(data, 0, reader.read(offset, data));


        int pos = 0;
        while( true ) {
            pos = bs.indexOf(header, pos);
            if( pos >= 0 ) {
                return offset+pos;
            } else {
                // need to load the next data chunck in..
                if( bs.length != data.length ) {
                    // If we had a short read then we were at EOF
                    return -1;
                }
                offset += bs.length-BATCH_CONTROL_RECORD_HEADER.length;
                bs = new ByteSequence(data, 0, reader.read(offset, data));
                pos=0;
            }
        }
    }

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    }


    public synchronized ByteSequence read(Location location) throws IOException, IllegalStateException {
        DataFile dataFile = getDataFile(location);
        DataFileAccessor reader = accessorPool.openDataFileAccessor(dataFile);
        ByteSequence rc = null;
        try {
            rc = reader.readRecord(location);
        } finally {
            accessorPool.closeDataFileAccessor(reader);
        }

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                    buff.writeByte(write.location.getType());
                    buff.write(write.data.getData(), write.data.getOffset(), write.data.getLength());
                    write = write.getNext();
                }


                ByteSequence sequence = buff.toByteSequence();
                
                // Now we can fill in the batch control record properly. 
                buff.reset();
                buff.skip(5+Journal.BATCH_CONTROL_RECORD_MAGIC.length);
                buff.writeInt(sequence.getLength()-Journal.BATCH_CONTROL_RECORD_SIZE);
                if( journal.isChecksum() ) {
                  Checksum checksum = new Adler32();
                  checksum.update(sequence.getData(), sequence.getOffset()+Journal.BATCH_CONTROL_RECORD_SIZE, sequence.getLength()-Journal.BATCH_CONTROL_RECORD_SIZE);
                  buff.writeLong(checksum.getValue());
                }


                // Now do the 1 big write.
                file.seek(wb.offset);
                if (maxStat > 0) {
                    if (statIdx < maxStat) {
                        stats[statIdx++] = sequence.getLength();
                    } else {
                        long all = 0;
                        for (;statIdx > 0;) {
                            all+= stats[--statIdx];
                        }
                        System.err.println("Ave writeSize: " + all/maxStat);
                    }
                }
                file.write(sequence.getData(), sequence.getOffset(), sequence.getLength());
                
                ReplicationTarget replicationTarget = journal.getReplicationTarget();
                if( replicationTarget!=null ) {
                  replicationTarget.replicate(wb.writes.getHead().location, sequence, forceToDisk);
                }

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                file.seek(location.getOffset() + Journal.RECORD_HEAD_SPACE);
            }


            byte[] data = new byte[location.getSize() - Journal.RECORD_HEAD_SPACE];
            file.readFully(data);
            return new ByteSequence(data, 0, data.length);


        } catch (RuntimeException e) {
            throw new IOException("Invalid location: " + location + ", : " + e);
        }
    }

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                            flushToDisk();
                        }
                    }
                }
                if (systemUsage.getTempUsage().waitForSpace(maxWaitTime)) {
                    ByteSequence bs = getByteSequence(node.getMessage());
                    getDiskList().addLast(node.getMessageId().toString(), bs);
                    return true;
                }
                return false;

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