Implemented DiscardMessage Output

graylog2-server/src/main/java/org/graylog2/outputs/DiscardMessageOutput.java

@@ -0,0 +1,102 @@
+/**
+ * This file is part of Graylog.
+ *
+ * Graylog is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Graylog is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Graylog.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package org.graylog2.outputs;
+
+import org.graylog2.plugin.Message;
+import org.graylog2.plugin.configuration.Configuration;
+import org.graylog2.plugin.configuration.ConfigurationRequest;
+import org.graylog2.plugin.outputs.MessageOutput;
+import org.graylog2.plugin.streams.Stream;
+import org.graylog2.shared.journal.Journal;
+
+import java.util.List;
+import java.util.Locale;
+import javax.inject.Inject;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.atomic.AtomicBoolean;
+import com.google.inject.assistedinject.Assisted;
+import com.google.inject.assistedinject.AssistedInject;
+
+
+public class DiscardMessageOutput implements MessageOutput {
+    private final AtomicBoolean isRunning = new AtomicBoolean(false);
+    private final Journal journal;
+
+    @AssistedInject
+    public DiscardMessageOutput(final Journal journal,
+				@Assisted Stream stream,
+				@Assisted Configuration configuration) {
+        this(journal);
+    }
+
+    @Inject
+    public DiscardMessageOutput(final Journal journal) {
+        this.journal = journal;
+        isRunning.set(true);
+    }
+
+    @Override
+    public void stop() {
+        isRunning.set(false);
+    }
+
+    @Override
+    public boolean isRunning() {
+        return isRunning.get();
+    }
+
+    @Override
+    public void write(Message message) throws Exception {
+        journal.markJournalOffsetCommitted(message.getJournalOffset());
+    }
+
+    @Override
+    public void write(List<Message> messages) throws Exception {
+        long maxOffset = Long.MIN_VALUE;
+
+        for (final Message message : messages) {
+            maxOffset = Math.max(message.getJournalOffset(), maxOffset);
+        }
+
+        journal.markJournalOffsetCommitted(maxOffset);
+    }
+
+    public interface Factory extends MessageOutput.Factory<GelfOutput> {
+        @Override
+        GelfOutput create(Stream stream, Configuration configuration);
+
+        @Override
+        Config getConfig();
+
+        @Override
+        Descriptor getDescriptor();
+    }
+
+    public static class Config extends MessageOutput.Config {
+        @Override
+        public ConfigurationRequest getRequestedConfiguration() {
+            return new ConfigurationRequest();
+        }
+    }
+
+    public static class Descriptor extends MessageOutput.Descriptor {
+        public Descriptor() {
+            super("Discard Message output", false, "", "Output that discards messages");
+        }
+    }
+}