com.shopwiki.roger.rpc.BasicWorkerFactory.java Source code

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Here is the source code for com.shopwiki.roger.rpc.BasicWorkerFactory.java

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/*
 * Copyright [2012] [ShopWiki]
 *
 * 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.shopwiki.roger.rpc;

import java.io.IOException;
import java.util.*;

import com.rabbitmq.client.*;
import com.shopwiki.roger.RabbitConnector;
import com.shopwiki.roger.rpc.RpcServer.WorkerFactory;

/**
 * Basic implementation of {@link WorkerFactory}.
 * The user instantiates one and adds their {@link RequestHandler}s to it.
 * Uses the same set of Channels (and Threads) for each {@link RequestHandler}.
 *
 * @author rstewart
 */
public class BasicWorkerFactory implements WorkerFactory {

    private final Map<String, RequestHandler<?, ?>> nameToHandler = new LinkedHashMap<String, RequestHandler<?, ?>>();

    private final RabbitConnector connector;
    private final int numThreads;

    public BasicWorkerFactory(RabbitConnector connector, int numThreads) {
        this.connector = connector;
        this.numThreads = numThreads;
    }

    public void addHandler(String name, RequestHandler<?, ?> handler) {
        nameToHandler.put(name, handler);
    }

    public Map<String, RequestHandler<?, ?>> getHandlerMap() {
        return Collections.unmodifiableMap(nameToHandler);
    }

    @Override
    public RpcWorkers createWorkers(String queuePrefix) throws IOException {
        Connection conn = null;
        try {
            conn = connector.getConnection(numThreads);

            List<Channel> channels = new ArrayList<Channel>();
            for (int i = 0; i < numThreads; i++) {
                Channel channel = conn.createChannel();
                channel.basicQos(1);
                channels.add(channel);
            }

            RpcWorkers workers = new RpcWorkers(conn);

            for (String procedureName : nameToHandler.keySet()) {
                RequestHandler<?, ?> handler = nameToHandler.get(procedureName);
                RpcWorker worker = new RpcWorker(handler, channels, queuePrefix, procedureName);
                workers.add(worker);
            }

            return workers;
            // TODO: Figure out a way to do this Exception handling outside of here ???
        } catch (IOException e) {
            RabbitConnector.closeConnection(conn);
            throw e;
        } catch (RuntimeException e) {
            RabbitConnector.closeConnection(conn);
            throw e;
        } catch (Error e) {
            RabbitConnector.closeConnection(conn);
            throw e;
        }
    }
}