Sync git svn branch with SVN repository r33308.

[simantics/platform.git] / bundles / org.simantics.db.indexing / src / org / simantics / db / indexing / internal / IndexingJob.java

diff --git a/bundles/org.simantics.db.indexing/src/org/simantics/db/indexing/internal/IndexingJob.java b/bundles/org.simantics.db.indexing/src/org/simantics/db/indexing/internal/IndexingJob.java
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+/*******************************************************************************\r
+ * Copyright (c) 2016 Association for Decentralized Information Management in\r
+ * Industry THTH ry.\r
+ * All rights reserved. This program and the accompanying materials\r
+ * are made available under the terms of the Eclipse Public License v1.0\r
+ * which accompanies this distribution, and is available at\r
+ * http://www.eclipse.org/legal/epl-v10.html\r
+ *\r
+ * Contributors:\r
+ *     Semantum Oy - initial API and implementation\r
+ *******************************************************************************/\r
+package org.simantics.db.indexing.internal;\r
+\r
+import java.util.concurrent.Semaphore;\r
+\r
+import org.eclipse.core.runtime.IProgressMonitor;\r
+import org.eclipse.core.runtime.IStatus;\r
+import org.eclipse.core.runtime.jobs.Job;\r
+import org.simantics.db.exception.DatabaseException;\r
+import org.simantics.db.function.DbConsumer;\r
+\r
+/**\r
+ * @author Tuukka Lehtonen\r
+ * @since 1.22.2, 1.25.0\r
+ */\r
+public abstract class IndexingJob extends Job {\r
+\r
+    /**\r
+     * NOTE: this is intentionally the same as\r
+     * <code>org.simantics.DatabaseJob.DATABASE_JOB_FAMILY</code> in order for\r
+     * this job to cause the same UI-behavior as DatabaseJob.\r
+     */\r
+    private static final String DATABASE_JOB_FAMILY = "org.simantics.db.inDatabaseJob";\r
+\r
+    public IndexingJob(String name) {\r
+        super(name);\r
+    }\r
+\r
+    @Override\r
+    public boolean belongsTo(Object family) {\r
+        return DATABASE_JOB_FAMILY.equals(family);\r
+    }\r
+\r
+    /**\r
+     * @param monitor\r
+     * @param jobName\r
+     * @param consumer\r
+     * @throws DatabaseException\r
+     */\r
+    public static void jobifyIfPossible(\r
+            IProgressMonitor monitor,\r
+            String jobName,\r
+            DbConsumer<IProgressMonitor> consumer)\r
+                    throws DatabaseException\r
+    {\r
+        // Prevent deadlocks by checking preconditions for using a job.\r
+        // JobManager is suspended e.g. during workbench startup.\r
+        if (Job.getJobManager().isSuspended() || Job.getJobManager().currentJob() != null) {\r
+            consumer.accept(monitor);\r
+            return;\r
+        }\r
+\r
+        Semaphore barrier = new Semaphore(0);\r
+        Throwable[] err = { null };\r
+        IndexingJob job = new IndexingJob(jobName) {\r
+            @Override\r
+            protected IStatus run(IProgressMonitor monitor) {\r
+                try {\r
+                    consumer.accept(monitor);\r
+                } catch (Throwable t) {\r
+                    err[0] = t;\r
+                } finally {\r
+                    monitor.done();\r
+                    barrier.release();\r
+                }\r
+                return org.eclipse.core.runtime.Status.OK_STATUS;\r
+            }\r
+        };\r
+        job.schedule();\r
+        try {\r
+            barrier.acquire();\r
+            if (err[0] != null) {\r
+                if (err[0] instanceof DatabaseException)\r
+                    throw (DatabaseException) err[0];\r
+                throw new DatabaseException(err[0]);\r
+            }\r
+        } catch (InterruptedException e) {\r
+            throw new DatabaseException(e);\r
+        }\r
+    }\r
+\r
+}\r