com.qwazr.utils.json.client.JsonMultiClientAbstract.java Source code

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Here is the source code for com.qwazr.utils.json.client.JsonMultiClientAbstract.java

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/**
 * Copyright 2014-2015 OpenSearchServer 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.qwazr.utils.json.client;

import java.net.URISyntaxException;
import java.util.Collection;
import java.util.HashMap;
import java.util.Iterator;
import java.util.concurrent.ExecutorService;

import javax.ws.rs.WebApplicationException;

import org.apache.commons.lang3.RandomUtils;
import org.slf4j.Logger;

import com.qwazr.utils.ExceptionUtils.ExceptionHolder;

public abstract class JsonMultiClientAbstract<T extends JsonClientAbstract> implements Iterable<T> {

    private final T[] clientsArray;
    private final HashMap<String, T> clientsMap;
    protected final ExecutorService executor;

    protected JsonMultiClientAbstract(ExecutorService executor, T[] clientArray, Collection<String> urls,
            int msTimeOut) throws URISyntaxException {
        this.executor = executor;
        clientsArray = clientArray;
        clientsMap = new HashMap<String, T>();
        for (String url : urls)
            clientsMap.put(url, newClient(url, msTimeOut));
        clientsMap.values().toArray(clientsArray);
    }

    /**
     * Create a new client
     * 
     * @param url
     *            the destination URL
     * @param msTimeOut
     *            the default time out
     * @return a new JsonClient
     * @throws URISyntaxException
     *             if any error occurs
     */
    protected abstract T newClient(String url, int msTimeOut) throws URISyntaxException;

    @Override
    public Iterator<T> iterator() {
        return new JsonClientIterator();
    }

    /**
     * Fill a collection with the URLs of the clients
     * 
     * @param urlCollection
     *            The collection to fill
     */
    public void fillClientUrls(Collection<String> urlCollection) {
        urlCollection.addAll(clientsMap.keySet());
    }

    /**
     * @return the number of clients
     */
    public int size() {
        return clientsArray.length;
    }

    /**
     * @param url
     *            the URL of the client
     * @return the client which handle this URL
     */
    public T getClientByUrl(String url) {
        return clientsMap.get(url.intern());
    }

    private class JsonClientIterator implements Iterator<T> {

        private int count = clientsArray.length;
        private int pos = RandomUtils.nextInt(0, clientsArray.length);

        @Override
        public boolean hasNext() {
            return count > 0;
        }

        @Override
        public T next() {
            T client = clientsArray[pos++];
            if (pos == clientsArray.length)
                pos = 0;
            count--;
            return client;
        }

        @Override
        public void remove() {
            throw new RuntimeException("Not available");
        }

    }

    public class WebAppExceptionHolder extends ExceptionHolder<WebApplicationException> {

        public WebAppExceptionHolder(Logger logger) {
            super(logger);
        }
    }
}