// Path: libraries/core/src/main/java/com/paritytrading/nassau/moldudp64/MoldUDP64.java
// class MoldUDP64 {
// 
//     static final int MESSAGE_COUNT_HEARTBEAT = 0x0;
// 
//     static final int MESSAGE_COUNT_END_OF_SESSION = 0xFFFF;
// 
//     static final int MAX_MESSAGE_COUNT = MESSAGE_COUNT_END_OF_SESSION - 1;
// 
//     static final int HEADER_LENGTH = 20;
// 
//     static final int MAX_PAYLOAD_LENGTH = 1400;
// 
//     static final int SESSION_LENGTH = 10;
// 
//     private static final byte SPACE = ' ';
// 
//     static byte[] session(String name) {
//         byte[] session = new byte[SESSION_LENGTH];
//         fill(session, SPACE);
// 
//         byte[] bytes = name.getBytes(US_ASCII);
//         System.arraycopy(bytes, 0, session, 0, Math.min(bytes.length, session.length));
// 
//         return session;
//     }
// 
// }
// 
// Path: libraries/core/src/main/java/com/paritytrading/nassau/moldudp64/MoldUDP64ClientState.java
// public enum MoldUDP64ClientState {
// 
//     /**
//      * The state of the client in relation to the server is unknown.
//      */
//     UNKNOWN,
// 
//     /**
//      * The client is yet to achieve synchronization with the server.
//      */
//     BACKFILL,
// 
//     /**
//      * The client is in synchronization with the server.
//      */
//     SYNCHRONIZED,
// 
//     /**
//      * The client has fallen out of synchronization with the server.
//      */
//     GAP_FILL,
// 
// }
// 
// Path: libraries/core/src/main/java/com/paritytrading/nassau/Clock.java
// public interface Clock {
// 
//     /**
//      * Get the current time in milliseconds.
//      *
//      * @return the current time in milliseconds
//      */
//     long currentTimeMillis();
// 
// }
// 
// Path: libraries/core/src/main/java/com/paritytrading/nassau/MessageListener.java
// public interface MessageListener {
// 
//     /**
//      * Receive a message. The message is contained in the buffer between the
//      * current position and the limit.
//      *
//      * @param buffer a buffer
//      * @throws IOException if an I/O error occurs
//      */
//     void message(ByteBuffer buffer) throws IOException;
// 
// }


import static com.paritytrading.foundation.ByteBuffers.*;
import static com.paritytrading.nassau.moldudp64.MoldUDP64.*;
import static com.paritytrading.nassau.moldudp64.MoldUDP64ClientState.*;
import com.paritytrading.nassau.Clock;
import com.paritytrading.nassau.MessageListener;
import java.io.Closeable;
import java.io.IOException;
import java.net.SocketAddress;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.channels.DatagramChannel;
/*
 * Copyright 2014 Nassau authors
 *
 * 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.paritytrading.nassau.moldudp64;



/**
 * An implementation of a MoldUDP64 client.
 */
public class MoldUDP64Client implements Closeable {

    private static final int RX_BUFFER_LENGTH = 65535;

    private static final long REQUEST_UNTIL_SEQUENCE_NUMBER_UNKNOWN = -1;

    private static final long REQUEST_TIMEOUT_MILLIS = 1000;

    private final Clock clock;

    private final DatagramChannel channel;

    private final DatagramChannel requestChannel;

    private final SocketAddress requestAddress;

// Path: libraries/core/src/main/java/com/paritytrading/nassau/moldudp64/MoldUDP64.java
// class MoldUDP64 {
// 
//     static final int MESSAGE_COUNT_HEARTBEAT = 0x0;
// 
//     static final int MESSAGE_COUNT_END_OF_SESSION = 0xFFFF;
// 
//     static final int MAX_MESSAGE_COUNT = MESSAGE_COUNT_END_OF_SESSION - 1;
// 
//     static final int HEADER_LENGTH = 20;
// 
//     static final int MAX_PAYLOAD_LENGTH = 1400;
// 
//     static final int SESSION_LENGTH = 10;
// 
//     private static final byte SPACE = ' ';
// 
//     static byte[] session(String name) {
//         byte[] session = new byte[SESSION_LENGTH];
//         fill(session, SPACE);
// 
//         byte[] bytes = name.getBytes(US_ASCII);
//         System.arraycopy(bytes, 0, session, 0, Math.min(bytes.length, session.length));
// 
//         return session;
//     }
// 
// }
// 
// Path: libraries/core/src/main/java/com/paritytrading/nassau/moldudp64/MoldUDP64ClientState.java
// public enum MoldUDP64ClientState {
// 
//     /**
//      * The state of the client in relation to the server is unknown.
//      */
//     UNKNOWN,
// 
//     /**
//      * The client is yet to achieve synchronization with the server.
//      */
//     BACKFILL,
// 
//     /**
//      * The client is in synchronization with the server.
//      */
//     SYNCHRONIZED,
// 
//     /**
//      * The client has fallen out of synchronization with the server.
//      */
//     GAP_FILL,
// 
// }
// 
// Path: libraries/core/src/main/java/com/paritytrading/nassau/Clock.java
// public interface Clock {
// 
//     /**
//      * Get the current time in milliseconds.
//      *
//      * @return the current time in milliseconds
//      */
//     long currentTimeMillis();
// 
// }
// 
// Path: libraries/core/src/main/java/com/paritytrading/nassau/MessageListener.java
// public interface MessageListener {
// 
//     /**
//      * Receive a message. The message is contained in the buffer between the
//      * current position and the limit.
//      *
//      * @param buffer a buffer
//      * @throws IOException if an I/O error occurs
//      */
//     void message(ByteBuffer buffer) throws IOException;
// 
// }


// Path: libraries/core/src/main/java/com/paritytrading/nassau/moldudp64/MoldUDP64Client.java
import static com.paritytrading.foundation.ByteBuffers.*;
import static com.paritytrading.nassau.moldudp64.MoldUDP64.*;
import static com.paritytrading.nassau.moldudp64.MoldUDP64ClientState.*;
import com.paritytrading.nassau.Clock;
import com.paritytrading.nassau.MessageListener;
import java.io.Closeable;
import java.io.IOException;
import java.net.SocketAddress;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.channels.DatagramChannel;

/*
 * Copyright 2014 Nassau authors
 *
 * 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.paritytrading.nassau.moldudp64;



/**
 * An implementation of a MoldUDP64 client.
 */
public class MoldUDP64Client implements Closeable {

    private static final int RX_BUFFER_LENGTH = 65535;

    private static final long REQUEST_UNTIL_SEQUENCE_NUMBER_UNKNOWN = -1;

    private static final long REQUEST_TIMEOUT_MILLIS = 1000;

    private final Clock clock;

    private final DatagramChannel channel;

    private final DatagramChannel requestChannel;

    private final SocketAddress requestAddress;

    private final MessageListener listener;