Java version Util : JVM Tool Interface « Development Class « Java

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Java » Development Class » JVM Tool Interface Screenshots  Java version Util          /**  *Copyright [2009-2010] [dennis zhuang([email protected])]  *Licensed 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  */ /**  *Copyright [2009-2010] [dennis zhuang([email protected])]  *Licensed 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 com.google.code.yanf4j.util; import java.io.IOException; import java.lang.reflect.Method; import java.net.InetAddress; import java.net.InetSocketAddress; import java.nio.channels.Selector; import java.nio.channels.spi.SelectorProvider; /**  * System utils  *   * @author dennis  *   */ public final class SystemUtils {   private SystemUtils() {   }   public static final String OS_NAME = System.getProperty("os.name");   private static boolean isLinuxPlatform = false;   static {     if (OS_NAME != null && OS_NAME.toLowerCase().indexOf("linux") >= 0) {       isLinuxPlatform = true;     }   }   public static final String JAVA_VERSION = System       .getProperty("java.version");   private static boolean isAfterJava6u4Version = false;   static {     if (JAVA_VERSION != null) {       // java4 or java5       if (JAVA_VERSION.indexOf("1.4.") >= 0           || JAVA_VERSION.indexOf("1.5.") >= 0) {         isAfterJava6u4Version = false;       } else if (JAVA_VERSION.indexOf("1.6.") >= 0) {         int index = JAVA_VERSION.indexOf("_");         if (index > 0) {           String subVersionStr = JAVA_VERSION.substring(index + 1);           if (subVersionStr != null && subVersionStr.length() > 0) {             try {               int subVersion = Integer.parseInt(subVersionStr);               if (subVersion >= 4) {                 isAfterJava6u4Version = true;               }             } catch (NumberFormatException e) {             }           }         }         // after java6       } else {         isAfterJava6u4Version = true;       }     }   }   public static final boolean isLinuxPlatform() {     return isLinuxPlatform;   }   public static final boolean isAfterJava6u4Version() {     return isAfterJava6u4Version;   }   public static void main(String[] args) {     System.out.println(isAfterJava6u4Version());   }   public static final int getSystemThreadCount() {     return getCpuProcessorCount();   }   public static final int getCpuProcessorCount() {     return Runtime.getRuntime().availableProcessors();   }   public static final Selector openSelector() throws IOException {     Selector result = null;     // check if it is linux os     if (SystemUtils.isLinuxPlatform()) {       try {         Class<?> providerClazz = Class             .forName("sun.nio.ch.EPollSelectorProvider");         if (providerClazz != null) {           try {             Method method = providerClazz.getMethod("provider");             if (method != null) {               SelectorProvider selectorProvider = (SelectorProvider) method                   .invoke(null);               if (selectorProvider != null) {                 result = selectorProvider.openSelector();               }             }           } catch (Exception e) {             // ignore           }         }       } catch (Exception e) {         // ignore       }     }     if (result == null) {       result = Selector.open();     }     return result;   }   public static final String getRawAddress(InetSocketAddress inetSocketAddress) {     InetAddress address = inetSocketAddress.getAddress();     return address != null ? address.getHostAddress() : inetSocketAddress         .getHostName();   } }                                           Related examples in the same category 1. Set the memory available to the JVM 2. jconsole plugin 3. This agent library can be used to track threads that wait on monitors. 4. Check the version of the interface being used 5. Track method call and return counts 6. Inject code at method calls 7. Do some very basic bytecode insertion (BCI) of class files 8. Byte Code Instrumentation (BCI) 9. How to get an easy view of the heap in terms of total object count and space used 10. Track object allocations 11. This agent library can be used to track garbage collection events 12. JVM Tool Interface agent utilities 13. Java Platform Debugger Architecture 14. Memory related 15. System memory 16. Floating Point Arithmetic 17. Logic and Integer Arithmetic 18. JVM Simulator 19. Stack memory view 20. JVM memory util 21. This class determines the version of the Java Virtual Machine. 22. Generate a listing of the most trusted certification authorities used by your JVM