From e11bce7ad3e803e80883499fec0ad6e4540ffe43 Mon Sep 17 00:00:00 2001
From: Kristóf Marussy <marussy@mit.bme.hu>
Date: Tue, 30 Jun 2020 18:03:48 +0200
Subject: Add modified VIATRA-DSE version

---
 .../viatra/dse/multithreading/DSEThreadPool.java   | 58 ++++++++++++++++++++++
 1 file changed, 58 insertions(+)
 create mode 100644 Solvers/VIATRA-Solver/org.eclipse.viatra.dse/src/org/eclipse/viatra/dse/multithreading/DSEThreadPool.java

(limited to 'Solvers/VIATRA-Solver/org.eclipse.viatra.dse/src/org/eclipse/viatra/dse/multithreading/DSEThreadPool.java')

diff --git a/Solvers/VIATRA-Solver/org.eclipse.viatra.dse/src/org/eclipse/viatra/dse/multithreading/DSEThreadPool.java b/Solvers/VIATRA-Solver/org.eclipse.viatra.dse/src/org/eclipse/viatra/dse/multithreading/DSEThreadPool.java
new file mode 100644
index 00000000..17e96a75
--- /dev/null
+++ b/Solvers/VIATRA-Solver/org.eclipse.viatra.dse/src/org/eclipse/viatra/dse/multithreading/DSEThreadPool.java
@@ -0,0 +1,58 @@
+/*******************************************************************************
+ * Copyright (c) 2010-2014, Miklos Foldenyi, Andras Szabolcs Nagy, Abel Hegedus, Akos Horvath, Zoltan Ujhelyi and Daniel Varro
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v. 2.0 which is available at
+ * http://www.eclipse.org/legal/epl-v20.html.
+ * 
+ * SPDX-License-Identifier: EPL-2.0
+ *******************************************************************************/
+package org.eclipse.viatra.dse.multithreading;
+
+import java.util.concurrent.RejectedExecutionException;
+import java.util.concurrent.SynchronousQueue;
+import java.util.concurrent.ThreadPoolExecutor;
+import java.util.concurrent.TimeUnit;
+
+import org.apache.log4j.Logger;
+import org.eclipse.viatra.dse.api.DesignSpaceExplorer;
+import org.eclipse.viatra.dse.base.ExplorerThread;
+
+/**
+ * 
+ * @author Andras Szabolcs Nagy
+ * 
+ */
+public class DSEThreadPool extends ThreadPoolExecutor {
+
+    private static final long THREAD_KEEP_ALIVE_IN_SECONDS = 60;
+
+    public DSEThreadPool() {
+        // Based on the Executors.newCachedThreadPool()
+        super(0, getProcNumber(), THREAD_KEEP_ALIVE_IN_SECONDS, TimeUnit.SECONDS, new SynchronousQueue<Runnable>());
+    }
+
+    // helper for constructor
+    private static int getProcNumber() {
+        return Runtime.getRuntime().availableProcessors();
+    }
+
+    public boolean tryStartNewStrategy(ExplorerThread strategy) {
+
+        if (!canStartNewThread()) {
+            return false;
+        }
+
+        try {
+            submit(strategy);
+        } catch (RejectedExecutionException e) {
+            Logger.getLogger(DesignSpaceExplorer.class).info("Couldn't start new thread.", e);
+            return false;
+        }
+
+        return true;
+    }
+
+    public boolean canStartNewThread() {
+        return getMaximumPoolSize() > getActiveCount();
+    }
+}
-- 
cgit v1.2.3-54-g00ecf