Examples with WriteBatch org.iq80.leveldb.WriteBatch used on opensource projects

Example 31 with WriteBatch

use of org.iq80.leveldb.WriteBatch in project jesos by groupon.

the class JLevelDBState method store.

@Override
public Future<Variable> store(final Variable variable) {
    checkNotNull(variable, "variable is null");
    checkState(!closed.get(), "already closed");
    checkState(variable instanceof JVariable, "can not process native variable, use JVariable");
    final JVariable v = (JVariable) variable;
    return executor.submit(new Callable<Variable>() {

        @Override
        public Variable call() throws Exception {
            final WriteOptions writeOptions = new WriteOptions();
            writeOptions.sync(true);
            final String internedName = v.getName().intern();
            synchronized (internedName) {
                final JVariable current = load(internedName);
                if (current == null || current.getUuid().equals(v.getUuid())) {
                    final JVariable update = new JVariable(internedName, v.value());
                    final WriteBatch writeBatch = db.createWriteBatch();
                    writeBatch.delete(bytes(internedName));
                    writeBatch.put(bytes(internedName), update.getEntry().toByteArray());
                    db.write(writeBatch, writeOptions);
                    return update;
                } else {
                    return null;
                }
            }
        }
    });
}

Example 32 with WriteBatch

use of org.iq80.leveldb.WriteBatch in project qi4j-sdk by Qi4j.

the class LevelDBEntityStoreMixin method applyChanges.

@Override
public void applyChanges(MapChanges changes) throws IOException {
    final WriteBatch writeBatch = db.createWriteBatch();
    try {
        changes.visitMap(new MapChanger() {

            @Override
            public Writer newEntity(final EntityReference ref, EntityDescriptor entityDescriptor) throws IOException {
                return new StringWriter(1000) {

                    @Override
                    public void close() throws IOException {
                        super.close();
                        String jsonState = toString();
                        writeBatch.put(ref.identity().getBytes(charset), jsonState.getBytes(charset));
                    }
                };
            }

            @Override
            public Writer updateEntity(final EntityReference ref, EntityDescriptor entityDescriptor) throws IOException {
                return new StringWriter(1000) {

                    @Override
                    public void close() throws IOException {
                        super.close();
                        String jsonState = toString();
                        writeBatch.put(ref.identity().getBytes(charset), jsonState.getBytes(charset));
                    }
                };
            }

            @Override
            public void removeEntity(EntityReference ref, EntityDescriptor entityDescriptor) throws EntityNotFoundException {
                writeBatch.delete(ref.identity().getBytes(charset));
            }
        });
        db.write(writeBatch);
    } finally {
        writeBatch.close();
    }
}