SocketConnectionFactory API improvements

@NotNull, specify bind address for server socket connection,
convert classes to interfaces to enable Kotlin SAM conversions

platform/platform-impl/src/com/intellij/util/io/socketConnection/AbstractResponseHandler.java

@@ -15,9 +15,11 @@
  */
 package com.intellij.util.io.socketConnection;
 
+import org.jetbrains.annotations.NotNull;
+
 /**
  * @author nik
  */
-public abstract class AbstractResponseHandler<R extends AbstractResponse> {
-  public abstract void processResponse(R response);
+public interface AbstractResponseHandler<R extends AbstractResponse> {
+  void processResponse(@NotNull R response);
 }

platform/platform-impl/src/com/intellij/util/io/socketConnection/AbstractResponseToRequestHandler.java

@@ -15,9 +15,14 @@
  */
 package com.intellij.util.io.socketConnection;
 
+import org.jetbrains.annotations.NotNull;
+
 /**
  * @author nik
  */
-public abstract class AbstractResponseToRequestHandler<R extends AbstractResponse> {
-  public abstract boolean processResponse(R response);
+public interface AbstractResponseToRequestHandler<R extends AbstractResponse> {
+  /**
+   * @return true if no further responses to this request are expected, false if more responses are coming
+   */
+  boolean processResponse(@NotNull R response);
 }

platform/platform-impl/src/com/intellij/util/io/socketConnection/SocketConnectionFactory.java

@@ -29,14 +29,14 @@ public class SocketConnectionFactory {
   }
 
   public static <Request extends AbstractRequest, Response extends AbstractResponse>
-    SocketConnection<Request, Response> createServerConnection(int defaultPort, int attempts, RequestResponseExternalizerFactory<Request, Response> factory) {
-    return new ServerSocketConnectionImpl<>(defaultPort, attempts, factory);
+    SocketConnection<Request, Response> createServerConnection(int defaultPort, @Nullable InetAddress bindAddress, int attempts, RequestResponseExternalizerFactory<Request, Response> factory) {
+    return new ServerSocketConnectionImpl<>(defaultPort, bindAddress, attempts, factory);
   }
 
 
   public static <Request extends AbstractRequest, Response extends AbstractResponse>
-    SocketConnection<Request, Response> createServerConnection(int defaultPort, RequestResponseExternalizerFactory<Request, Response> factory) {
-    return new ServerSocketConnectionImpl<>(defaultPort, 1, factory);
+    SocketConnection<Request, Response> createServerConnection(int defaultPort, @Nullable InetAddress bindAddress, RequestResponseExternalizerFactory<Request, Response> factory) {
+    return new ServerSocketConnectionImpl<>(defaultPort, bindAddress, 1, factory);
   }
 
   public static <Request extends AbstractRequest, Response extends AbstractResponse>

platform/platform-impl/src/com/intellij/util/io/socketConnection/impl/ServerSocketConnectionImpl.java

@@ -8,8 +8,10 @@ import com.intellij.util.io.socketConnection.AbstractResponse;
 import com.intellij.util.io.socketConnection.ConnectionStatus;
 import com.intellij.util.io.socketConnection.RequestResponseExternalizerFactory;
 import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
 
 import java.io.IOException;
+import java.net.InetAddress;
 import java.net.ServerSocket;
 import java.net.Socket;
 
@@ -20,14 +22,17 @@ public class ServerSocketConnectionImpl<Request extends AbstractRequest, Respons
   private static final Logger LOG = Logger.getInstance("#com.intellij.util.io.socketConnection.impl.ServerSocketConnectionImpl");
   private ServerSocket myServerSocket;
   private final int myDefaultPort;
-  private final int myConnectionAttempts;
+  private final int myPortChoiceAttempts;
+  @Nullable private final InetAddress myBindAddress;
 
   public ServerSocketConnectionImpl(int defaultPort,
-                                    int connectionAttempts,
+                                    @Nullable InetAddress bindAddress,
+                                    int portChoiceAttempts,
                                     @NotNull RequestResponseExternalizerFactory<Request, Response> factory) {
     super(factory);
     myDefaultPort = defaultPort;
-    myConnectionAttempts = connectionAttempts;
+    myPortChoiceAttempts = portChoiceAttempts;
+    myBindAddress = bindAddress;
   }
 
   @Override
@@ -48,10 +53,10 @@ public class ServerSocketConnectionImpl<Request extends AbstractRequest, Respons
   @NotNull
   private ServerSocket createSocket() throws IOException {
     IOException exc = null;
-    for (int i = 0; i < myConnectionAttempts; i++) {
+    for (int i = 0; i < myPortChoiceAttempts; i++) {
       int port = myDefaultPort + i;
       try {
-        return new ServerSocket(port);
+        return new ServerSocket(port, 0, myBindAddress);
       }
       catch (IOException e) {
         exc = e;