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Encrypted, high-performance, and event-driven/reactive network stack for Java 11+
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/*
 * Copyright 2010 dorkbox, llc
 *
 * 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 dorkbox.network.connection;

import dorkbox.network.connection.bridge.ConnectionBridge;
import dorkbox.network.connection.idle.IdleBridge;
import dorkbox.network.connection.idle.IdleSender;
import dorkbox.network.rmi.RemoteObject;
import dorkbox.network.rmi.TimeoutException;

import java.io.IOException;

@SuppressWarnings("unused")
public
interface Connection {

    /**
     * Has the remote ECC public key changed. This can be useful if specific actions are necessary when the key has changed.
     */
    boolean hasRemoteKeyChanged();

    /**
     * @return the remote address, as a string.
     */
    String getRemoteHost();

    /**
     * @return true if this connection is established on the loopback interface
     */
    boolean isLoopback();

    /**
     * @return the endpoint associated with this connection
     */
    @SuppressWarnings("rawtypes")
    EndPoint getEndPoint();


    /**
     * @return the connection (TCP or LOCAL) id of this connection.
     */
    int id();

    /**
     * @return the connection (TCP or LOCAL) id of this connection as a HEX string.
     */
    String idAsHex();

    /**
     * @return true if this connection is also configured to use UDP
     */
    boolean hasUDP();

    /**
     * @return true if this connection is also configured to use UDT
     */
    boolean hasUDT();

    /**
     * Expose methods to send objects to a destination (such as a custom object or a standard ping)
     */
    ConnectionBridge send();

    /**
     * Expose methods to send objects to a destination when the connection has become idle.
     */
    IdleBridge sendOnIdle(IdleSender sender);

    /**
     * Expose methods to send objects to a destination when the connection has become idle.
     */
    IdleBridge sendOnIdle(Object message);

    /**
     * Expose methods to modify the connection listeners.
     */
    ListenerBridge listeners();

    /**
     * Closes the connection
     */
    void close();

    /**
     * Marks the connection to be closed as soon as possible. This is evaluated when the current
     * thread execution returns to the network stack.
     */
    void closeAsap();

    /**
     * Returns a new proxy object implements the specified interface. Methods invoked on the proxy object will be
     * invoked remotely on the object with the specified ID in the ObjectSpace for the current connection.
     * 
     * This will request a registration ID from the remote endpoint, and will block until the object
     * has been returned.
     * 

     * Methods that return a value will throw {@link TimeoutException} if the
     * response is not received with the
     * {@link RemoteObject#setResponseTimeout(int) response timeout}.
     * 

     * If {@link RemoteObject#setAsync(boolean) non-blocking} is false
     * (the default), then methods that return a value must not be called from
     * the update thread for the connection. An exception will be thrown if this
     * occurs. Methods with a void return value can be called on the update
     * thread.
     * 

     * If a proxy returned from this method is part of an object graph sent over
     * the network, the object graph on the receiving side will have the proxy
     * object replaced with the registered (non-proxy) object.
     *
     * @see RemoteObject
     */
     Iface createProxyObject(final Class remoteImplementationClass) throws IOException;


    /**
     * Returns a new proxy object implements the specified interface. Methods invoked on the proxy object will be
     * invoked remotely on the object with the specified ID in the ObjectSpace for the current connection.
     * 

     * This will REUSE a registration ID from the remote endpoint, and will block until the object
     * has been returned.
     * 

     * Methods that return a value will throw {@link TimeoutException} if the
     * response is not received with the
     * {@link RemoteObject#setResponseTimeout(int) response timeout}.
     * 

     * If {@link RemoteObject#setAsync(boolean) non-blocking} is false
     * (the default), then methods that return a value must not be called from
     * the update thread for the connection. An exception will be thrown if this
     * occurs. Methods with a void return value can be called on the update
     * thread.
     * 
     * If a proxy returned from this method is part of an object graph sent over
     * the network, the object graph on the receiving side will have the proxy
     * object replaced with the registered (non-proxy) object.
     *
     * @see RemoteObject
     */
     Iface getProxyObject(final int objectId) throws IOException;
}