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package org.jvnet.glassfish.comms.admin.clbadmin;
import com.sun.enterprise.admin.servermgmt.pe.PEFileLayout;
import com.sun.enterprise.config.ConfigContext;
import com.sun.enterprise.config.serverbeans.ConvergedLoadBalancer;
import com.sun.enterprise.util.SystemPropertyConstants;
import org.jvnet.glassfish.comms.clb.admin.Loadbalancer;
import org.jvnet.glassfish.comms.clb.admin.ObjectFactory;
import org.jvnet.glassfish.comms.admin.clbadmin.reader.api.LoadbalancerReader;
import org.jvnet.glassfish.comms.admin.clbadmin.transform.LoadbalancerVisitor;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.File;
import java.io.IOException;
import java.io.ByteArrayOutputStream;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.math.BigInteger;
import java.util.Properties;
/**
* Helper Class to Load Balancer Admin Event
* @author Srinivas Krishnan
*/
public class ClbAdminEventHelper {
private static final String DIGEST_FILE = "digestfile.properties";
private ClbConfigPublisher _clbp = null;
private String _name = null;
private String _lbName = null;
private String _configName = null;
private ConfigContext _ctx = null;
/**
* Default constructor.
*/
public ClbAdminEventHelper(ConfigContext ctx, ClbConfigPublisher clbp, ConvergedLoadBalancer clb, String configName) {
_clbp = clbp;
_name = clb.getConvergedLbConfigName();
_lbName = clb.getName();
_ctx = ctx;
_configName = configName;
}
public boolean isApplyChangesRequired() {
boolean applyChanges = false;
String iRoot = System.getProperty(SystemPropertyConstants.INSTANCE_ROOT_PROPERTY);
String digestFilePath = iRoot + File.separator + PEFileLayout.CONFIG_DIR + File.separator + _configName + File.separator + DIGEST_FILE;
String key = _name + "." + _lbName;
String str = getClbXML();
String lastDigestValue = getLastDigestValue(digestFilePath, key);
String currentDigestValue = getMessageDigest(str);
if (!currentDigestValue.equals(lastDigestValue)) {
// write the latest digest value into the digest file
storeLatestDigestValue(digestFilePath, currentDigestValue, key);
applyChanges = true;
}
return applyChanges;
}
public String getClbXML() {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
try {
LoadbalancerReader lbr = _clbp.getLbReader(_ctx, _name);
// tranform the data using visitor pattern
Loadbalancer _lb = new Loadbalancer();
LoadbalancerVisitor lbVstr = new LoadbalancerVisitor(_lb);
lbr.accept(lbVstr);
ObjectFactory clbFactory = new ObjectFactory();
clbFactory.store(_lb, baos);
} catch (Exception e) {
System.out.println(e.getMessage());
}
return baos.toString();
}
public String getMessageDigest(String lbxml) {
String hash = "";
try {
MessageDigest md = MessageDigest.getInstance("MD5");
md.update(lbxml.getBytes());
hash = new BigInteger(md.digest()).toString(16);
}catch(NoSuchAlgorithmException e){
System.out.println(e.getMessage());
}
return hash;
}
public String getLastDigestValue(String sPath, String keyName) {
Properties prop = new Properties();
String lastDigestValue = null;
try {
File digestFile = new File(sPath);
FileInputStream digestInputStream = new FileInputStream(digestFile);
if (digestInputStream != null) {
prop.load(digestInputStream);
lastDigestValue = prop.getProperty(keyName);
}
} catch (IOException ioe) {
lastDigestValue = "";
}
return lastDigestValue;
}
public static void storeLatestDigestValue(String sPath, String digestValue, String keyName) {
Properties prop = new Properties();
prop.setProperty(keyName, digestValue);
boolean created = false;
File digestFile = new File(sPath);
try {
if (!digestFile.exists())
created = digestFile.createNewFile();
if (digestFile.exists() || created) {
FileOutputStream digestOutputStream = new FileOutputStream(digestFile);
if (digestOutputStream != null)
prop.store(digestOutputStream, "");
}
}catch (IOException ioe) {
System.out.println(ioe.getMessage());
}
}
public static String getConfigFileNewValue(String fileName) {
if (fileName == null)
return "";
int versionNumPos = fileName.lastIndexOf(".v");
String versionNum = "0";
if (versionNumPos != -1) {
versionNum = fileName.substring(versionNumPos+2);
try {
int ver = Integer.parseInt(versionNum);
ver++;
versionNum = String.valueOf(ver);
} catch (Exception e) {
versionNum = "0";
}
fileName = fileName.substring(0,versionNumPos);
}
versionNum = ".v" + versionNum;
String newFileName = fileName + versionNum;
return newFileName;
}
public static boolean isClbDebug() {
return Boolean.parseBoolean(System.getProperty("clbreconfig.debug"));
}
}