[PAXLOGGING-311] Tests showing that there's no problem creating 10000…

… non-static loggers on 64M of heap in 1.11.x and 2.0.x

pax-logging-it/pom.xml

@@ -69,6 +69,7 @@
                     <forkCount>1</forkCount>
                     <reuseForks>false</reuseForks>
                     <trimStackTrace>false</trimStackTrace>
+                    <argLine>-Xmx64M -XX:+HeapDumpOnOutOfMemoryError</argLine>
                 </configuration>
                 <executions>
                     <execution>

pax-logging-it/src/test/java/org/ops4j/pax/logging/it/Log4J1MemoryIntegrationTest.java

@@ -0,0 +1,79 @@
+/*
+ * 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.ops4j.pax.logging.it;
+
+import java.io.IOException;
+import java.util.UUID;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.ops4j.pax.exam.Configuration;
+import org.ops4j.pax.exam.Option;
+import org.ops4j.pax.exam.junit.PaxExam;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import static org.ops4j.pax.exam.OptionUtils.combine;
+
+@RunWith(PaxExam.class)
+public class Log4J1MemoryIntegrationTest extends AbstractControlledIntegrationTestBase {
+
+    @Configuration
+    public Option[] configure() throws IOException {
+        return combine(
+                combine(baseConfigure(), defaultLoggingConfig()),
+
+                paxLoggingApi(),
+                paxLoggingLog4J1(),
+                configAdmin(),
+                eventAdmin()
+        );
+    }
+
+    @Test
+    public void memoryIssues() throws IOException {
+        LOG.info("Starting");
+        String[] loggerNames = new String[10_000];
+        for (int i = 0; i < 10_000; i++) {
+            loggerNames[i] = UUID.randomUUID().toString();
+        }
+        for (int i = 0; i < 1_000_000; i++) {
+            if (i % 10_000 == 0) {
+                LOG.info("iteration {}", i);
+                System.gc();
+            }
+            new MyClass(loggerNames[i % 10_000]).run();
+        }
+        LOG.info("Done");
+    }
+
+    private static class MyClass {
+        private Logger nonStaticLogger;
+
+        public MyClass(String name) {
+            this.nonStaticLogger = LoggerFactory.getLogger(name);
+        }
+
+        public void run() {
+            // running a method
+            nonStaticLogger.trace("Hello!");
+        }
+    }
+
+}

pax-logging-it/src/test/java/org/ops4j/pax/logging/it/Log4J2MemoryIntegrationTest.java

@@ -0,0 +1,79 @@
+/*
+ * 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.ops4j.pax.logging.it;
+
+import java.io.IOException;
+import java.util.UUID;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.ops4j.pax.exam.Configuration;
+import org.ops4j.pax.exam.Option;
+import org.ops4j.pax.exam.junit.PaxExam;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import static org.ops4j.pax.exam.OptionUtils.combine;
+
+@RunWith(PaxExam.class)
+public class Log4J2MemoryIntegrationTest extends AbstractControlledIntegrationTestBase {
+
+    @Configuration
+    public Option[] configure() throws IOException {
+        return combine(
+                combine(baseConfigure(), defaultLoggingConfig()),
+
+                paxLoggingApi(),
+                paxLoggingLog4J2(),
+                configAdmin(),
+                eventAdmin()
+        );
+    }
+
+    @Test
+    public void memoryIssues() throws IOException {
+        LOG.info("Starting");
+        String[] loggerNames = new String[10_000];
+        for (int i = 0; i < 10_000; i++) {
+            loggerNames[i] = UUID.randomUUID().toString();
+        }
+        for (int i = 0; i < 1_000_000; i++) {
+            if (i % 10_000 == 0) {
+                LOG.info("iteration {}", i);
+                System.gc();
+            }
+            new Log4J2MemoryIntegrationTest.MyClass(loggerNames[i % 10_000]).run();
+        }
+        LOG.info("Done");
+    }
+
+    private static class MyClass {
+        private Logger nonStaticLogger;
+
+        public MyClass(String name) {
+            this.nonStaticLogger = LoggerFactory.getLogger(name);
+        }
+
+        public void run() {
+            // running a method
+            nonStaticLogger.trace("Hello!");
+        }
+    }
+
+}

pax-logging-it/src/test/java/org/ops4j/pax/logging/it/LogbackMemoryIntegrationTest.java

@@ -0,0 +1,81 @@
+/*
+ * 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.ops4j.pax.logging.it;
+
+import java.io.IOException;
+import java.util.UUID;
+
+import org.junit.Ignore;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.ops4j.pax.exam.Configuration;
+import org.ops4j.pax.exam.Option;
+import org.ops4j.pax.exam.junit.PaxExam;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import static org.ops4j.pax.exam.OptionUtils.combine;
+
+@RunWith(PaxExam.class)
+public class LogbackMemoryIntegrationTest extends AbstractControlledIntegrationTestBase {
+
+    @Configuration
+    public Option[] configure() throws IOException {
+        return combine(
+                combine(baseConfigure(), defaultLoggingConfig()),
+
+                paxLoggingApi(),
+                paxLoggingLogback(),
+                configAdmin(),
+                eventAdmin()
+        );
+    }
+
+    @Test
+//    @Ignore("Logback in this scenario is broken beyond any repair.")
+    public void memoryIssues() throws IOException {
+        LOG.info("Starting");
+        String[] loggerNames = new String[10_000];
+        for (int i = 0; i < 10_000; i++) {
+            loggerNames[i] = UUID.randomUUID().toString();
+        }
+        for (int i = 0; i < 1_000_000; i++) {
+            if (i % 10_000 == 0) {
+                LOG.info("iteration {}", i);
+                System.gc();
+            }
+            new LogbackMemoryIntegrationTest.MyClass(loggerNames[i % 10_000]).run();
+        }
+        LOG.info("Done");
+    }
+
+    private static class MyClass {
+        private Logger nonStaticLogger;
+
+        public MyClass(String name) {
+            this.nonStaticLogger = LoggerFactory.getLogger(name);
+        }
+
+        public void run() {
+            // running a method
+            nonStaticLogger.trace("Hello!");
+        }
+    }
+
+}