Examples with Pointer com.baidu.hugegraph.computer.core.store.hgkvfile.entry.Pointer used on opensource projects

Example 1 with Pointer

use of com.baidu.hugegraph.computer.core.store.hgkvfile.entry.Pointer in project hugegraph-computer by hugegraph.

the class CombineSubKvOuterSortFlusher method flush.

@Override
public void flush(EntryIterator entries, HgkvDirBuilder writer) throws IOException {
    E.checkArgument(entries.hasNext(), "Parameter entries can't be empty");
    PeekableIterator<KvEntry> kvEntries = PeekableIteratorAdaptor.of(entries);
    SubKvSorter sorter = new SubKvSorter(kvEntries, this.sources);
    KvEntry currentKv = sorter.currentKv();
    while (true) {
        currentKv.key().write(this.output);
        long position = this.output.position();
        // Write total sub-entry length placeholder
        this.output.writeFixedInt(0);
        // Write sub-entry count placeholder
        this.output.writeFixedInt(0);
        int writtenCount = 0;
        // Iterate subKv of currentKv
        KvEntry lastSubKv = sorter.next();
        Pointer lastSubValue = lastSubKv.value();
        while (true) {
            KvEntry current = null;
            if (sorter.hasNext()) {
                current = sorter.next();
                if (lastSubKv.compareTo(current) == 0) {
                    lastSubValue = this.combiner.combine(lastSubValue, current.value());
                    continue;
                }
            }
            lastSubKv.key().write(this.output);
            lastSubValue.write(this.output);
            writtenCount++;
            /*
                 * Fill placeholder if the number of subkvs with different
                 * keys is equal to the subKvFlushThreshold.
                 */
            if (current == null || writtenCount == this.subKvFlushThreshold) {
                long currentPosition = this.output.position();
                this.output.seek(position);
                this.output.writeFixedInt((int) (currentPosition - position - Integer.BYTES));
                this.output.writeFixedInt(writtenCount);
                this.output.seek(currentPosition);
                // Write kvEntry to file.
                RandomAccessInput input = EntriesUtil.inputFromOutput(this.output);
                writer.write(EntriesUtil.kvEntryFromInput(input, true, true));
                this.output.seek(0);
                if (current == null) {
                    break;
                }
                currentKv.key().write(this.output);
                position = this.output.position();
                // Write value length placeholder
                this.output.writeFixedInt(0);
                // Write subKv count placeholder
                this.output.writeFixedInt(0);
                writtenCount = 0;
            }
            lastSubKv = current;
            lastSubValue = lastSubKv.value();
        }
        sorter.reset();
        // Get next KV
        if ((currentKv = sorter.currentKv()) == null) {
            break;
        }
    }
    writer.finish();
}