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The Reactive Oracle Client
There is a newer version: 5.0.0.CR2
/*
 * Copyright (c) 2011-2023 Contributors to the Eclipse Foundation
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License 2.0 which is available at
 * http://www.eclipse.org/legal/epl-2.0, or the Apache License, Version 2.0
 * which is available at https://www.apache.org/licenses/LICENSE-2.0.
 *
 * SPDX-License-Identifier: EPL-2.0 OR Apache-2.0
 */
package io.vertx.oracleclient.impl.commands;

import io.vertx.core.Future;
import io.vertx.core.Promise;
import io.vertx.core.impl.ContextInternal;
import io.vertx.oracleclient.impl.Helper.SQLBlockingCodeHandler;
import io.vertx.sqlclient.impl.command.CommandBase;
import io.vertx.sqlclient.impl.command.CommandResponse;
import oracle.jdbc.OracleConnection;

import java.util.concurrent.Flow;

import static io.vertx.oracleclient.impl.FailureUtil.sanitize;
import static io.vertx.oracleclient.impl.Helper.SQLBlockingTaskHandler;

public abstract class OracleCommand {

  protected final OracleConnection oracleConnection;
  protected final ContextInternal connectionContext;
  private CommandResponse response;

  protected OracleCommand(OracleConnection oracleConnection, ContextInternal connectionContext) {
    this.oracleConnection = oracleConnection;
    this.connectionContext = connectionContext;
  }

  public final Future processCommand(CommandBase cmd) {
    return execute().andThen(ar -> {
      if (ar.succeeded()) {
        response = CommandResponse.success(ar.result());
      } else {
        response = CommandResponse.failure(ar.cause());
      }
      response.cmd = cmd;
    }).mapEmpty();
  }

  protected abstract Future execute();

  public final  Future executeBlocking(SQLBlockingCodeHandler blockingCodeHandler) {
    return connectionContext.executeBlocking(blockingCodeHandler, false);
  }

  public final Future executeBlocking(SQLBlockingTaskHandler blockingTaskHandler) {
    return connectionContext.executeBlocking(blockingTaskHandler, false);
  }

  public final  Future first(Flow.Publisher publisher) {
    Promise promise = connectionContext.promise();
    publisher.subscribe(new Flow.Subscriber<>() {
      volatile Flow.Subscription subscription;

      @Override
      public void onSubscribe(Flow.Subscription subscription) {
        subscription.request(1);
      }

      @Override
      public void onNext(U item) {
        promise.tryComplete(item);
        subscription.cancel();
      }

      @Override
      public void onError(Throwable throwable) {
        promise.fail(sanitize(throwable));
      }

      @Override
      public void onComplete() {
        // Use tryComplete as the completion signal can be sent even if we cancelled.
        // Also, for Publisher we would get in this case.
        promise.tryComplete(null);
      }
    });
    return promise.future();
  }

  public final void fireResponse() {
    response.fire();
  }
}