From 6818878737a9de0075976f79157e07283e7713d7 Mon Sep 17 00:00:00 2001
From: Christian Femers <femers@in.tum.de>
Date: Tue, 3 Sep 2019 07:12:26 +0200
Subject: [PATCH] Experimental approach to register machines via extension
 point

Note: this does not work currently. Most likely, because the @Execute tagged method is not executed. How ironic. Need to look into that and how this works (it should work like that somehow)
---
 net.mograsim.machine/META-INF/MANIFEST.MF     |  7 +-
 .../net/mograsim/machine/MachineRegistry.java | 69 +++++++++++++++++++
 2 files changed, 73 insertions(+), 3 deletions(-)
 create mode 100644 net.mograsim.machine/src/net/mograsim/machine/MachineRegistry.java

diff --git a/net.mograsim.machine/META-INF/MANIFEST.MF b/net.mograsim.machine/META-INF/MANIFEST.MF
index dfdcb05d..f7842aef 100644
--- a/net.mograsim.machine/META-INF/MANIFEST.MF
+++ b/net.mograsim.machine/META-INF/MANIFEST.MF
@@ -6,9 +6,10 @@ Bundle-Version: 0.1.0.qualifier
 Bundle-Vendor: Mograsim Team
 Automatic-Module-Name: net.mograsim.machine
 Bundle-RequiredExecutionEnvironment: JavaSE-11
-Require-Bundle: net.mograsim.logic.core;bundle-version="0.1.0",
- net.mograsim.logic.model;bundle-version="0.1.0",
- net.mograsim.preferences
+Require-Bundle: net.mograsim.logic.model;bundle-version="0.1.0";visibility:=reexport,
+ net.mograsim.preferences,
+ org.eclipse.e4.core.di.annotations,
+ org.eclipse.core.runtime
 Export-Package: net.mograsim.machine,
  net.mograsim.machine.isa,
  net.mograsim.machine.isa.types,
diff --git a/net.mograsim.machine/src/net/mograsim/machine/MachineRegistry.java b/net.mograsim.machine/src/net/mograsim/machine/MachineRegistry.java
new file mode 100644
index 00000000..865a8993
--- /dev/null
+++ b/net.mograsim.machine/src/net/mograsim/machine/MachineRegistry.java
@@ -0,0 +1,69 @@
+package net.mograsim.machine;
+
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.Set;
+
+import org.eclipse.core.runtime.CoreException;
+import org.eclipse.core.runtime.IConfigurationElement;
+import org.eclipse.core.runtime.IExtensionRegistry;
+import org.eclipse.core.runtime.ISafeRunnable;
+import org.eclipse.core.runtime.SafeRunner;
+import org.eclipse.e4.core.di.annotations.Execute;
+
+public class MachineRegistry
+{
+	private static final String MACHINE_EXT_ID = "net.mograsim.machine.machinedefinition";
+
+	private static Set<MachineDefinition> installedMachines = new HashSet<>();
+
+	@Execute
+	public void execute(IExtensionRegistry registry)
+	{
+		System.out.println(Arrays.toString(registry.getExtensionPoints("net.mograsim.machine")));
+		IConfigurationElement[] config = registry.getConfigurationElementsFor(MACHINE_EXT_ID);
+		try
+		{
+			for (IConfigurationElement e : config)
+			{
+				final Object o = e.createExecutableExtension("class");
+				if (o instanceof MachineDefinition)
+				{
+					executeExtension(o);
+				} else
+				{
+					System.err.println("Invalid machine definition: " + o);
+				}
+			}
+		}
+		catch (CoreException ex)
+		{
+			System.out.println(ex.getMessage());
+		}
+	}
+
+	private void executeExtension(final Object o)
+	{
+		ISafeRunnable runnable = new ISafeRunnable()
+		{
+			@Override
+			public void handleException(Throwable e)
+			{
+				System.out.println("Exception in client");
+			}
+
+			@Override
+			public void run() throws Exception
+			{
+				System.out.println(((MachineDefinition) o).getAddressBits());
+			}
+		};
+		SafeRunner.run(runnable);
+	}
+
+	public static Set<MachineDefinition> getinstalledMachines()
+	{
+		return Collections.unmodifiableSet(installedMachines);
+	}
+}
-- 
2.17.1