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A universal transaction manager that achieves database-agnostic transactions and distributed transactions that span multiple databases

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package com.scalar.db.transaction.rpc;

import com.scalar.db.api.Delete;
import com.scalar.db.api.Get;
import com.scalar.db.api.Mutation;
import com.scalar.db.api.Put;
import com.scalar.db.api.Result;
import com.scalar.db.api.Scan;
import com.scalar.db.common.AbstractDistributedTransaction;
import com.scalar.db.exception.transaction.AbortException;
import com.scalar.db.exception.transaction.CommitException;
import com.scalar.db.exception.transaction.CrudException;
import com.scalar.db.exception.transaction.RollbackException;
import com.scalar.db.exception.transaction.UnknownTransactionStatusException;
import java.util.List;
import java.util.Optional;
import javax.annotation.concurrent.NotThreadSafe;

@NotThreadSafe
public class GrpcTransaction extends AbstractDistributedTransaction {

  private final String txId;
  private final GrpcTransactionOnBidirectionalStream stream;

  public GrpcTransaction(String txId, GrpcTransactionOnBidirectionalStream stream) {
    this.txId = txId;
    this.stream = stream;
  }

  @Override
  public String getId() {
    return txId;
  }

  @Override
  public Optional get(Get get) throws CrudException {
    get = copyAndSetTargetToIfNot(get);
    return stream.get(get);
  }

  @Override
  public List scan(Scan scan) throws CrudException {
    scan = copyAndSetTargetToIfNot(scan);
    return stream.scan(scan);
  }

  @Override
  public void put(Put put) throws CrudException {
    put = copyAndSetTargetToIfNot(put);
    stream.mutate(put);
  }

  @Override
  public void put(List puts) throws CrudException {
    mutate(puts);
  }

  @Override
  public void delete(Delete delete) throws CrudException {
    delete = copyAndSetTargetToIfNot(delete);
    stream.mutate(delete);
  }

  @Override
  public void delete(List deletes) throws CrudException {
    mutate(deletes);
  }

  @Override
  public void mutate(List mutations) throws CrudException {
    mutations = copyAndSetTargetToIfNot(mutations);
    stream.mutate(mutations);
  }

  @Override
  public void commit() throws CommitException, UnknownTransactionStatusException {
    stream.commit();
  }

  @Override
  public void rollback() throws RollbackException {
    stream.rollback();
  }

  @Override
  public void abort() throws AbortException {
    stream.abort();
  }
}