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Asynchronous PostgreSQL Java driver

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/*
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.github.pgasync.impl;


import com.github.pgasync.Connection;
import com.github.pgasync.Row;
import rx.Observable;
import rx.Subscriber;

/**
 * @author Antti Laisi
 */
public class ConnectionValidator {

    final String validationQuery;

    public ConnectionValidator(String validationQuery) {
        this.validationQuery = validationQuery;
    }

    public Observable validate(Connection connection) {
        return connection.queryRows(validationQuery)
                .lift(subscriber -> new Subscriber() {
                    @Override
                    public void onError(Throwable e) {
                        subscriber.onError(e);
                    }
                    @Override
                    public void onCompleted() {
                        subscriber.onNext(connection);
                        subscriber.onCompleted();
                    }
                    @Override
                    public void onNext(Row row) { }
                });
    }

}