Add a logging scheduled executor service.

src/com/dmdirc/util/LoggingScheduledExecutorService.java

@@ -0,0 +1,88 @@
+/*
+ * Copyright (c) 2006-2015 DMDirc Developers
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+package com.dmdirc.util;
+
+import com.dmdirc.DMDircMBassador;
+import com.dmdirc.events.AppErrorEvent;
+import com.dmdirc.logger.ErrorLevel;
+
+import com.google.common.util.concurrent.ThreadFactoryBuilder;
+
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.Future;
+import java.util.concurrent.ScheduledThreadPoolExecutor;
+import java.util.function.BiConsumer;
+
+/**
+ * An scheduled executor service that takes logs failed executions either via eventbus errors or a
+ * custom error function.
+ */
+public class LoggingScheduledExecutorService extends ScheduledThreadPoolExecutor {
+
+    private final BiConsumer<Runnable, Throwable> afterExecute;
+
+    /**
+     * Creates a new instance of this executor service.
+     *
+     * @param coreSize The number of threads to keep in the pool, even if they are idle, unless
+     *                 {@code allowCoreThreadTimeOut} is set
+     * @param eventBus The event bus to raise errors on
+     * @param poolName The naming format to use when naming threads
+     */
+    public LoggingScheduledExecutorService(final int coreSize,
+            final DMDircMBassador eventBus, final String poolName) {
+        this(coreSize, (r, t) -> eventBus
+                .publishAsync(new AppErrorEvent(ErrorLevel.HIGH, t, t.getMessage(), "")), poolName);
+    }
+
+    /**
+     * Creates a new instance of this executor service.
+     *
+     * @param coreSize     The number of threads to keep in the pool, even if they are idle,
+     *                     unless {@code allowCoreThreadTimeOut} is set
+     * @param afterExecute The function to call when an exception occurs
+     * @param poolName     The naming format to use when naming threads
+     */
+    public LoggingScheduledExecutorService(final int coreSize,
+            final BiConsumer<Runnable, Throwable> afterExecute, final String poolName) {
+        super(coreSize, new ThreadFactoryBuilder().setNameFormat(poolName + "-%d").build());
+        this.afterExecute = afterExecute;
+    }
+
+    @Override
+    protected void afterExecute(final Runnable r, final Throwable t) {
+        super.afterExecute(r, t);
+        if (t == null && r instanceof Future<?>) {
+            try {
+                ((Future<?>) r).get();
+            } catch (ExecutionException ex) {
+                afterExecute.accept(r, ex);
+            } catch (InterruptedException ex) {
+                //Ignore
+            }
+        }
+        if (t != null) {
+            afterExecute.accept(r, t);
+        }
+    }
+}