Implement register and forwarding of IPC events.

runt/apis/cldc-compact/cc/squirreljme/jvm/IPCManager.java

@@ -9,6 +9,9 @@
 
 package cc.squirreljme.jvm;
 
+import java.util.HashMap;
+import java.util.Map;
+
 /**
  * This class is used to manage the IPC interface and allow any service to
  * register IPC messages and such.
@@ -17,6 +20,10 @@ package cc.squirreljme.jvm;
  */
 public final class IPCManager
 {
+	/** Services that are available. */
+	private static final Map<Integer, IPCCallback> _IPC_MAP =
+		new HashMap<>();
+	
 	/**
 	 * No instances of this class.
 	 *
@@ -45,7 +52,22 @@ public final class IPCManager
 	public static final long ipcCall(int __tid, int __ipcid, int __a, int __b,
 		int __c, int __d, int __e, int __f, int __g, int __h)
 	{
-		throw new todo.TODO();
+		IPCCallback handler = null;
+		
+		// Find the IPC Callback handler
+		Map<Integer, IPCCallback> ipcmap = _IPC_MAP;
+		synchronized (ipcmap)
+		{
+			handler = ipcmap.get(__ipcid);
+		}
+		
+		// Drop the call if there is no handler
+		if (handler == null)
+			return 0;
+		
+		// Perform the call
+		return handler.ipcCall(__tid, __ipcid, __a, __b, __c, __d, __e, __f,
+			__g, __h);
 	}
 	
 	/**
@@ -53,16 +75,27 @@ public final class IPCManager
 	 *
 	 * @param __ipcid The IPC ID to listen on.
 	 * @param __cb The callback for the IPC.
+	 * @throws IllegalArgumentException If IPC ID is zero.
 	 * @throws NullPointerException On null arguments.
 	 * @since 2019/12/28
 	 */
-	public static final void register(int __ipcod, IPCCallback __cb)
-		throws NullPointerException
+	public static final void register(int __ipcid, IPCCallback __cb)
+		throws IllegalArgumentException, NullPointerException
 	{
 		if (__cb == null)
 			throw new NullPointerException("NARG");
 		
-		throw new todo.TODO();
+		// {@squirreljme.error ZZ3u It is not valid to register the zero
+		// IPC ID.}
+		if (__ipcid == 0)
+			throw new IllegalArgumentException("ZZ3u");
+		
+		// Lock and register
+		Map<Integer, IPCCallback> ipcmap = _IPC_MAP;
+		synchronized (ipcmap)
+		{
+			ipcmap.put(__ipcid, __cb);
+		}
 	}
 }