ARTEMIS-201 warn of potential OOME

artemis-server/src/main/java/org/apache/activemq/artemis/core/server/ActiveMQServerLogger.java

@@ -1195,6 +1195,10 @@ public interface ActiveMQServerLogger extends BasicLogger {
    @Message(id = 222204, value = "Duplicated Acceptor {0} with parameters {1} classFactory={2} duplicated on the configuration", format = Message.Format.MESSAGE_FORMAT)
    void duplicatedAcceptor(String name, String parameters, String classFactory);
 
+   @LogMessage(level = Logger.Level.WARN)
+   @Message(id = 222205, value = "OutOfMemoryError possible! There are currently {0} addresses with a total max-size-bytes of {1} bytes, but the maximum memory available is {2} bytes.", format = Message.Format.MESSAGE_FORMAT)
+   void potentialOOME(long addressCount, long totalMaxSizeBytes, long maxMemory);
+
    @LogMessage(level = Logger.Level.ERROR)
    @Message(id = 224000, value = "Failure in initialisation", format = Message.Format.MESSAGE_FORMAT)
    void initializationError(@Cause Throwable e);

artemis-server/src/main/java/org/apache/activemq/artemis/core/server/impl/ActiveMQServerImpl.java

@@ -1622,6 +1622,8 @@ public class ActiveMQServerImpl implements ActiveMQServer {
       // this needs to be done before clustering is fully activated
       callActivateCallbacks();
 
+      checkForPotentialOOMEInAddressConfiguration();
+
       if (!scalingDown) {
          // Deploy any pre-defined diverts
          deployDiverts();
@@ -1674,6 +1676,20 @@ public class ActiveMQServerImpl implements ActiveMQServer {
       }
    }
 
+   private void checkForPotentialOOMEInAddressConfiguration() {
+      long totalMaxSizeBytes = 0;
+      long addressCount = 0;
+      for (SimpleString address : postOffice.getAddresses()) {
+         totalMaxSizeBytes += addressSettingsRepository.getMatch(address.toString()).getMaxSizeBytes();
+         addressCount++;
+      }
+
+      long maxMemory = Runtime.getRuntime().maxMemory();
+      if (totalMaxSizeBytes >= maxMemory) {
+         ActiveMQServerLogger.LOGGER.potentialOOME(addressCount, totalMaxSizeBytes, maxMemory);
+      }
+   }
+
    private void deployAddressSettingsFromConfiguration() {
       for (Map.Entry<String, AddressSettings> entry : configuration.getAddressesSettings().entrySet()) {
          addressSettingsRepository.addMatch(entry.getKey(), entry.getValue(), true);

tests/integration-tests/src/test/java/org/apache/activemq/artemis/tests/integration/server/PotentialOOMELoggingTest.java

@@ -0,0 +1,60 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.activemq.artemis.tests.integration.server;
+
+import java.util.UUID;
+
+import org.apache.activemq.artemis.core.config.CoreQueueConfiguration;
+import org.apache.activemq.artemis.core.server.ActiveMQServer;
+import org.apache.activemq.artemis.core.settings.impl.AddressSettings;
+import org.apache.activemq.artemis.logs.AssertionLoggerHandler;
+import org.apache.activemq.artemis.tests.util.ActiveMQTestBase;
+import org.junit.AfterClass;
+import org.junit.Assert;
+import org.junit.BeforeClass;
+import org.junit.Test;
+
+public class PotentialOOMELoggingTest extends ActiveMQTestBase {
+
+   @BeforeClass
+   public static void prepareLogger() {
+      AssertionLoggerHandler.startCapture();
+   }
+
+   @Test
+   /**
+    * When running this test from an IDE add this to the test command line so that the AssertionLoggerHandler works properly:
+    *
+    *   -Djava.util.logging.manager=org.jboss.logmanager.LogManager  -Dlogging.configuration=file:<path_to_source>/tests/config/logging.properties
+    */
+   public void testBlockLogging() throws Exception {
+      ActiveMQServer server = createServer(false, createDefaultInVMConfig());
+      for (int i = 0; i < 10000; i++) {
+         server.getConfiguration().addQueueConfiguration(new CoreQueueConfiguration().setAddress(UUID.randomUUID().toString()).setName(UUID.randomUUID().toString()));
+      }
+      server.getConfiguration().getAddressesSettings().put("#", new AddressSettings().setMaxSizeBytes(10485760 * 10));
+      server.start();
+
+      // Using the code only so the test doesn't fail just because someone edits the log text
+      Assert.assertTrue("Expected to find 222205", AssertionLoggerHandler.findText("AMQ222205"));
+   }
+
+   @AfterClass
+   public static void clearLogger() {
+      AssertionLoggerHandler.stopCapture();
+   }
+}