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/*
 * Copyright 2011 The Netty Project
 *
 * The Netty Project licenses this file to you 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 io.netty.channel.socket.http;

import java.security.SecureRandom;

/**
 * Default implementation of TunnelIdGenerator, which uses a
 * {@link java.security.SecureRandom SecureRandom} generator
 * to produce 32-bit tunnel identifiers.
 */
public class DefaultTunnelIdGenerator implements TunnelIdGenerator {

    private SecureRandom generator;

    public DefaultTunnelIdGenerator() {
        this(new SecureRandom());
    }

    public DefaultTunnelIdGenerator(SecureRandom generator) {
        this.generator = generator;
    }

    @Override
    public synchronized String generateId() {
        // synchronized to ensure that this code is thread safe. The Sun
        // standard implementations seem to be synchronized or lock free
        // but are not documented as guaranteeing this
        return Integer.toHexString(generator.nextInt());
    }

}