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/*
 * Copyright 2014 arnab.
 *
 * 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.arnabk;

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.ThreadFactory;

/**
 * This is a non-blocking class and the caller will be released immediately. This will continuously check the status of hostsToCheck every 
 * frequencyInMins. It will work in background
 * 
 * @author arnab
 */
public class NonBlockingChecker extends BlockingChecker {

    private final ExecutorService executor = Executors.newSingleThreadExecutor(new ThreadFactory() {
        final ThreadFactory delegate = Executors.defaultThreadFactory();

        @Override
        public Thread newThread(Runnable r) {
            Thread result = delegate.newThread(r);
            result.setName("server-status-" + result.getName());
            return result;
        }
    });

    @Override
    public void execute(final int frequencyInMins, final String... hostsToCheck) {
        executor.execute(new Runnable() {

            public void run() {
                execute(frequencyInMins, hostsToCheck);
            }

        });
    }

}