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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.common;

import com.scalar.db.api.Delete;
import com.scalar.db.api.Get;
import com.scalar.db.api.Insert;
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.api.TransactionState;
import com.scalar.db.api.TwoPhaseCommitTransaction;
import com.scalar.db.api.TwoPhaseCommitTransactionManager;
import com.scalar.db.api.Update;
import com.scalar.db.api.Upsert;
import com.scalar.db.exception.transaction.CrudException;
import com.scalar.db.exception.transaction.TransactionException;
import com.scalar.db.exception.transaction.TransactionNotFoundException;
import com.scalar.db.exception.transaction.UnknownTransactionStatusException;
import java.util.List;
import java.util.Optional;
import java.util.function.BiConsumer;

public abstract class DecoratedTwoPhaseCommitTransactionManager
    implements TwoPhaseCommitTransactionManager,
        TwoPhaseCommitTransactionDecoratorAddable,
        TwoPhaseCommitTransactionExpirationHandlerSettable {

  private final TwoPhaseCommitTransactionManager transactionManager;

  public DecoratedTwoPhaseCommitTransactionManager(
      TwoPhaseCommitTransactionManager transactionManager) {
    this.transactionManager = transactionManager;
  }

  /** @deprecated As of release 3.6.0. Will be removed in release 5.0.0 */
  @Deprecated
  @Override
  public void with(String namespace, String tableName) {
    transactionManager.with(namespace, tableName);
  }

  /** @deprecated As of release 3.6.0. Will be removed in release 5.0.0 */
  @Deprecated
  @Override
  public void withNamespace(String namespace) {
    transactionManager.withNamespace(namespace);
  }

  /** @deprecated As of release 3.6.0. Will be removed in release 5.0.0 */
  @Deprecated
  @Override
  public Optional getNamespace() {
    return transactionManager.getNamespace();
  }

  /** @deprecated As of release 3.6.0. Will be removed in release 5.0.0 */
  @Deprecated
  @Override
  public void withTable(String tableName) {
    transactionManager.withTable(tableName);
  }

  /** @deprecated As of release 3.6.0. Will be removed in release 5.0.0 */
  @Deprecated
  @Override
  public Optional getTable() {
    return transactionManager.getTable();
  }

  @Override
  public TwoPhaseCommitTransaction begin() throws TransactionException {
    return transactionManager.begin();
  }

  @Override
  public TwoPhaseCommitTransaction begin(String txId) throws TransactionException {
    return transactionManager.begin(txId);
  }

  @Override
  public TwoPhaseCommitTransaction start() throws TransactionException {
    return transactionManager.start();
  }

  @Override
  public TwoPhaseCommitTransaction start(String txId) throws TransactionException {
    return transactionManager.start(txId);
  }

  @Override
  public TwoPhaseCommitTransaction resume(String txId) throws TransactionNotFoundException {
    return transactionManager.resume(txId);
  }

  @Override
  public TwoPhaseCommitTransaction join(String txId) throws TransactionException {
    return transactionManager.join(txId);
  }

  @Override
  public Optional get(Get get) throws CrudException, UnknownTransactionStatusException {
    return transactionManager.get(get);
  }

  @Override
  public List scan(Scan scan) throws CrudException, UnknownTransactionStatusException {
    return transactionManager.scan(scan);
  }

  /** @deprecated As of release 3.13.0. Will be removed in release 5.0.0. */
  @Deprecated
  @Override
  public void put(Put put) throws CrudException, UnknownTransactionStatusException {
    transactionManager.put(put);
  }

  /** @deprecated As of release 3.13.0. Will be removed in release 5.0.0. */
  @Deprecated
  @Override
  public void put(List puts) throws CrudException, UnknownTransactionStatusException {
    transactionManager.put(puts);
  }

  @Override
  public void insert(Insert insert) throws CrudException, UnknownTransactionStatusException {
    transactionManager.insert(insert);
  }

  @Override
  public void upsert(Upsert upsert) throws CrudException, UnknownTransactionStatusException {
    transactionManager.upsert(upsert);
  }

  @Override
  public void update(Update update) throws CrudException, UnknownTransactionStatusException {
    transactionManager.update(update);
  }

  @Override
  public void delete(Delete delete) throws CrudException, UnknownTransactionStatusException {
    transactionManager.delete(delete);
  }

  /** @deprecated As of release 3.13.0. Will be removed in release 5.0.0. */
  @Deprecated
  @Override
  public void delete(List deletes) throws CrudException, UnknownTransactionStatusException {
    transactionManager.delete(deletes);
  }

  @Override
  public void mutate(List mutations)
      throws CrudException, UnknownTransactionStatusException {
    transactionManager.mutate(mutations);
  }

  @Override
  public TransactionState getState(String txId) throws TransactionException {
    return transactionManager.getState(txId);
  }

  @Override
  public TransactionState rollback(String txId) throws TransactionException {
    return transactionManager.rollback(txId);
  }

  @Override
  public TransactionState abort(String txId) throws TransactionException {
    return transactionManager.abort(txId);
  }

  @Override
  public void close() {
    transactionManager.close();
  }

  public TwoPhaseCommitTransactionManager getOriginalTransactionManager() {
    if (transactionManager instanceof DecoratedTwoPhaseCommitTransactionManager) {
      return ((DecoratedTwoPhaseCommitTransactionManager) transactionManager)
          .getOriginalTransactionManager();
    }
    return transactionManager;
  }

  @Override
  public void addTransactionDecorator(TwoPhaseCommitTransactionDecorator transactionDecorator) {
    if (transactionManager instanceof TwoPhaseCommitTransactionDecoratorAddable) {
      ((TwoPhaseCommitTransactionDecoratorAddable) transactionManager)
          .addTransactionDecorator(transactionDecorator);
    }
  }

  @Override
  public void setTransactionExpirationHandler(
      BiConsumer handler) {
    if (transactionManager instanceof TwoPhaseCommitTransactionExpirationHandlerSettable) {
      ((TwoPhaseCommitTransactionExpirationHandlerSettable) transactionManager)
          .setTransactionExpirationHandler(handler);
    }
  }
}