server/container/guice/protocols/pop/src/main/java/org/apache/james/modules/protocols/Pop3GuiceProbe.java

/****************************************************************
 * Licensed to the Apache Software Foundation (ASF) under one   *
 * or more contributor license agreements.  See the NOTICE file *
 * distributed with this work for additional information        *
 * regarding copyright ownership.  The ASF 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 org.apache.james.modules.protocols;

import java.net.InetSocketAddress;

import javax.inject.Inject;

import org.apache.james.pop3server.netty.POP3ServerFactory;
import org.apache.james.utils.GuiceProbe;


public class Pop3GuiceProbe implements GuiceProbe {

    private final POP3ServerFactory pop3ServerFactory;

    @Inject
    private Pop3GuiceProbe(POP3ServerFactory pop3ServerFactory) {
        this.pop3ServerFactory = pop3ServerFactory;
    }

    public int getPop3Port() {
        return pop3ServerFactory.getServers().stream()
                .findFirst()
                .flatMap(server -> server.getListenAddresses().stream().findFirst())
                .map(InetSocketAddress::getPort)
                .orElseThrow(() -> new IllegalStateException("POP3 server not defined"));
    }
}