JournalIndex index,
JournalSerdes namespace) {
super(channel, segment, maxEntrySize, index, namespace);
+ mappedBuffer = mapBuffer(channel, maxSegmentSize);
+ buffer = mappedBuffer.slice();
+ reset(0);
+ }
+
+ MappedJournalSegmentWriter(JournalSegmentWriter<E> previous, int position) {
+ super(previous);
+ mappedBuffer = mapBuffer(channel, maxSegmentSize);
+ buffer = mappedBuffer.slice();
+ lastEntry = previous.getLastEntry();
+ buffer.position(position);
+ }
+
+ private static @NonNull MappedByteBuffer mapBuffer(FileChannel channel, int maxSegmentSize) {
try {
- mappedBuffer = channel.map(FileChannel.MapMode.READ_WRITE, 0, segment.descriptor().maxSegmentSize());
+ return channel.map(FileChannel.MapMode.READ_WRITE, 0, maxSegmentSize);
} catch (IOException e) {
throw new StorageException(e);
}
- this.buffer = mappedBuffer.slice();
- reset(0);
}
@Override
@Override
FileChannelJournalSegmentWriter<E> toFileChannel() {
+ final int position = buffer.position();
close();
- return new FileChannelJournalSegmentWriter<>(channel, segment, maxEntrySize, index, namespace);
+ return new FileChannelJournalSegmentWriter<>(this, position);
}
@Override
- public void reset(long index) {
+ void reset(long index) {
long nextIndex = firstIndex;
// Clear the buffer indexes.
}
@Override
- public long getLastIndex() {
- return lastEntry != null ? lastEntry.index() : segment.index() - 1;
- }
-
- @Override
- public Indexed<E> getLastEntry() {
+ Indexed<E> getLastEntry() {
return lastEntry;
}
@Override
- public long getNextIndex() {
+ long getNextIndex() {
if (lastEntry != null) {
return lastEntry.index() + 1;
} else {
}
}
- @Override
- public void append(Indexed<E> entry) {
- final long nextIndex = getNextIndex();
-
- // If the entry's index is greater than the next index in the segment, skip some entries.
- if (entry.index() > nextIndex) {
- throw new IndexOutOfBoundsException("Entry index is not sequential");
- }
-
- // If the entry's index is less than the next index, truncate the segment.
- if (entry.index() < nextIndex) {
- truncate(entry.index() - 1);
- }
- append(entry.entry());
- }
-
@Override
@SuppressWarnings("unchecked")
- public <T extends E> Indexed<T> append(T entry) {
+ <T extends E> Indexed<T> append(T entry) {
// Store the entry index.
final long index = getNextIndex();
return (Indexed<T>) indexedEntry;
}
-
@Override
- public void truncate(long index) {
+ void truncate(long index) {
// If the index is greater than or equal to the last index, skip the truncate.
if (index >= getLastIndex()) {
return;
// Truncate the index.
this.index.truncate(index);
- if (index < segment.index()) {
+ if (index < firstIndex) {
// Reset the writer to the first entry.
buffer.position(JournalSegmentDescriptor.BYTES);
} else {
}
@Override
- public void flush() {
+ void flush() {
mappedBuffer.force();
}
@Override
- public void close() {
+ void close() {
flush();
try {
BufferCleaner.freeBuffer(mappedBuffer);