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[simantics/platform.git] / bundles / org.simantics / src / org / simantics / internal / UnhandledExceptionServiceImpl.java

diff --git a/bundles/org.simantics/src/org/simantics/internal/UnhandledExceptionServiceImpl.java b/bundles/org.simantics/src/org/simantics/internal/UnhandledExceptionServiceImpl.java
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+/*******************************************************************************
+ * Copyright (c) 2019 Association for Decentralized Information Management
+ * in Industry THTH ry.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     Semantum Oy - initial API and implementation
+ *******************************************************************************/
+package org.simantics.internal;
+
+import java.util.ArrayList;
+import java.util.Hashtable;
+import java.util.List;
+import java.util.function.Consumer;
+
+import org.osgi.framework.BundleContext;
+import org.osgi.framework.ServiceRegistration;
+import org.simantics.UnhandledExceptionService;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * @author Antti Villberg
+ */
+public class UnhandledExceptionServiceImpl implements UnhandledExceptionService {
+
+    private static final Logger LOGGER = LoggerFactory.getLogger(UnhandledExceptionServiceImpl.class);
+    private static ServiceRegistration<?> service = null;
+
+    private final List<Consumer<Throwable>>       handlers   = new ArrayList<>();
+
+    /**
+     * Invoked by the bundle activator to initialize the cache service.
+     * 
+     * @param context the bundle context to register the service with
+     */
+    @SuppressWarnings({ "unchecked", "rawtypes" })
+    public synchronized static void initialize(BundleContext context) {
+        if (service == null) {
+            service = context.registerService(UnhandledExceptionService.class.getName(), new UnhandledExceptionServiceImpl(), new Hashtable());
+        }
+    }
+
+    /**
+     * Invoked by the bundle activator to close the cache service.
+     */
+    public synchronized static void close() {
+        if (service != null) {
+            service.unregister();
+            service = null;
+        }
+    }
+
+    @Override
+    public synchronized void registerHandler(Consumer<Throwable> handler) {
+        handlers.add(handler);
+    }
+
+    @Override
+    public synchronized void handle(Throwable t) {
+        for (Consumer<Throwable> handler : handlers) {
+            try {
+                handler.accept(t);
+            } catch (Exception e) {
+                handleException(handler, e);
+            } catch (LinkageError e) {
+                handleException(handler, e);
+            } catch (AssertionError e) {
+                handleException(handler, e);
+            }
+        }
+    }
+
+    protected void handleException(Object source, Throwable t) {
+        LOGGER.error("{}: Unhandled exception handler {} caused unexpected exception", getClass().getSimpleName(), source, t);
+    }
+
+}