/*
 * Copyright (c) 2008-2012, Hazel Bilisim Ltd. All Rights Reserved.
 *
 * 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.hazelcast.impl.management;

import com.hazelcast.core.HazelcastInstance;
import com.hazelcast.examples.TestApp;

import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

public class ConsoleCommandHandler {

    private final ConsoleApp app;
    private final Lock lock = new ReentrantLock();
    private final StringBuilder buffer = new StringBuilder();

    public ConsoleCommandHandler(HazelcastInstance instance) {
        super();
        this.app = new ConsoleApp(instance);
    }

    public String handleCommand(final String command) throws InterruptedException {
        if ("exit".equals(command) || "quit".equals(command)) {
            return "'" + command + "' is not allowed!";
        }
        if (lock.tryLock(1, TimeUnit.SECONDS)) {
            try {
                return doHandleCommand(command);
            } finally {
                lock.unlock();
            }
        }
        return "'" + command + "' execution is timed out!";
    }

    String doHandleCommand(final String command) {
        app.handleCommand(command);
        final String output = buffer.toString();
        buffer.setLength(0);
        return output;
    }

    private class ConsoleApp extends TestApp {
        public ConsoleApp(HazelcastInstance hazelcast) {
            super(hazelcast);
        }

        protected void handleCommand(String command) {
            super.handleCommand(command);
        }

        protected void handleAddListener(String[] args) {
            println("Listener commands are not allowed!");
        }

        protected void handleRemoveListener(String[] args) {
            println("Listener commands are not allowed!");
        }

        public void println(Object obj) {
            print(obj);
            print('\n');
        }

        public void print(Object obj) {
            buffer.append(String.valueOf(obj));
        }
    }
}