PairSupplierFactoryLoadBalancer.java

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/*
 * Copyright (c) 2010-2012 Grid Dynamics Consulting Services, Inc, All Rights Reserved
 * http://www.griddynamics.com
 *
 * This library is free software; you can redistribute it and/or modify it under the terms of
 * the Apache License; either
 * version 2.0 of the License, or any later version.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package com.griddynamics.jagger.invoker;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public abstract class PairSupplierFactoryLoadBalancer<Q, E> extends QueryPoolLoadBalancer<Q, E> {

    private final static Logger logger = LoggerFactory.getLogger(PairSupplierFactoryLoadBalancer.class);
    private PairSupplierFactory<Q, E> pairSupplierFactory;
    private PairSupplier<Q, E> pairSupplier;

    public void setPairSupplierFactory(PairSupplierFactory<Q, E> pairSupplierFactory) {
        this.pairSupplierFactory = pairSupplierFactory;
    }

    protected PairSupplier<Q, E> getPairSupplier(){
        if (endpointProvider == null){
            throw new NullPointerException("Init endpoint provider!");
        }
        if (queryProvider == null) {
            logger.debug("Query provider is null!");
        }

        if (pairSupplier == null){
            pairSupplier = pairSupplierFactory.create(queryProvider, endpointProvider);
        }

        return pairSupplier;
    }

}