[GitHub] [lucene-solr] uschindler commented on a change in pull request #1364: SOLR-14335: Lock Solr's memory to prevent swapping

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uschindler commented on a change in pull request #1364: SOLR-14335: Lock Solr's memory to prevent swapping
URL: https://github.com/apache/lucene-solr/pull/1364#discussion_r396320238
 
 

 ##########
 File path: solr/bootstrap/src/java/org/apache/solr/bootstrap/NativeLibrary.java
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 @@ -0,0 +1,139 @@
+/*
+ * 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.solr.bootstrap;
+
+import com.sun.jna.LastErrorException;
+import org.eclipse.jetty.start.StartLog;
+
+import static org.apache.solr.bootstrap.NativeLibrary.OSType.*;
+
+public final class NativeLibrary {
+  public enum OSType {
+    LINUX,
+    MAC,
+    WINDOWS,
+    AIX,
+    OTHER;
+  }
+
+  public static final OSType osType;
+
+  private static final int MCL_CURRENT;
+
+  private static final int ENOMEM = 12;
+
+  private static final NativeLibraryWrapper wrappedLibrary;
+  private static boolean jnaLockable = false;
+
+  static {
+    // detect the OS type the JVM is running on and then set the CLibraryWrapper
+    // instance to a compatable implementation of CLibraryWrapper for that OS type
+    osType = getOsType();
+    switch (osType) {
+      case MAC:
+        wrappedLibrary = new NativeLibraryDarwin();
+        break;
+      case WINDOWS:
+        wrappedLibrary = new NativeLibraryWindows();
+        break;
+      case LINUX:
+      case AIX:
+      case OTHER:
+      default:
+        wrappedLibrary = new NativeLibraryLinux();
+    }
+
+    if (System.getProperty("os.arch").toLowerCase().contains("ppc")) {
+      if (osType == LINUX) {
+        MCL_CURRENT = 0x2000;
+      } else if (osType == AIX) {
+        MCL_CURRENT = 0x100;
+      } else {
+        MCL_CURRENT = 1;
+      }
+    } else {
+      MCL_CURRENT = 1;
+    }
+  }
+
+  private NativeLibrary() {
+  }
+
+  /**
+   * @return the detected OSType of the Operating System running the JVM using crude string matching
+   */
+  private static OSType getOsType() {
 
 Review comment:
   we already detect the OS type using `oal.util.Constants`. We should not duplicate code here.

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