/*
 * Copyright DataStax, Inc.
 *
 * 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.datastax.driver.stress;

import com.datastax.driver.core.Session;
import com.datastax.driver.core.exceptions.DriverException;
import com.google.common.util.concurrent.Uninterruptibles;

public class BlockingConsumer implements Consumer {

    private final Runner runner = new Runner();

    private final Session session;
    private final QueryGenerator requests;
    private final Reporter reporter;

    public BlockingConsumer(Session session,
                            QueryGenerator requests,
                            Reporter reporter) {
        this.session = session;
        this.requests = requests;
        this.reporter = reporter;
        this.runner.setDaemon(true);
    }

    @Override
    public void start() {
        this.runner.start();
    }

    @Override
    public void join() {
        Uninterruptibles.joinUninterruptibly(this.runner);
    }

    private class Runner extends Thread {

        public Runner() {
            super("Consumer Threads");
        }

        @Override
        public void run() {
            try {
                while (requests.hasNext())
                    handle(requests.next());
            } catch (DriverException e) {
                System.err.println("Error during query: " + e.getMessage());
            }
        }

        protected void handle(QueryGenerator.Request request) {
            Reporter.Context ctx = reporter.newRequest();
            try {
                request.execute(session);
            } finally {
                ctx.done();
            }
        }
    }
}
