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package com.sun.enterprise.admin.server.core.channel;
import java.io.File;
import java.io.FileWriter;
import java.io.FileReader;
import java.io.BufferedReader;
import com.sun.enterprise.util.io.FileUtils;
import com.sun.enterprise.util.SystemPropertyConstants;
import java.util.logging.Level;
import java.util.logging.Logger;
import com.sun.enterprise.util.i18n.StringManager;
import java.io.IOException;
/**
* Responsible for persisting restart required state.
*
* @author Nazrul Islam
* @since JDK1.4
*/
public class RRStateFactory {
/**
* Saves the restart required state of the server instance.
*
* @param state restart required state
* @throws IOException if an i/o error
*/
public static void saveState(boolean state) throws IOException {
File stateFile = getStateFile(null);
FileWriter fw = new FileWriter(stateFile);
try {
fw.write(Boolean.toString(state));
fw.flush();
} finally {
if (fw != null) {
try {
fw.close();
} catch (IOException e) {}
}
}
}
/**
* Reads the persisted server instance's restart required state.
* If the state file is not present, it returns false, i.e.,
* server instance does not require a restart.
*
* This uses current server's instance root.
*
* @return restart required state
*/
public static boolean getState() {
return getState(null);
}
/**
* Reads the persisted server instance's restart required state.
* If the state file is not present, it returns false, i.e.,
* server instance does not require a restart.
*
* @param instanceRoot server instance root
* @return restart required state
*/
public static boolean getState(String instanceRoot) {
boolean restartNeeded = false;
File f = getStateFile(instanceRoot);
if (f.exists()) {
BufferedReader br = null;
try {
br = new BufferedReader(new FileReader(f));
String state = br.readLine();
restartNeeded = new Boolean(state.trim()).booleanValue();
} catch (IOException ioe) {
} finally {
if (br != null) {
try {
br.close();
} catch (IOException e) {}
}
}
}
return restartNeeded;
}
/**
* Removes the restart required state file.
*/
public static void removeStateFile() {
File state = getStateFile(null);
if (state.exists()) {
FileUtils.liquidate(state);
}
}
/**
* Returns the state file handle.
*
* @param iRoot instance root
* @return the state file
*/
private static File getStateFile(String instanceRoot) {
// instance root
if (instanceRoot == null) {
instanceRoot = System.getProperty(
SystemPropertyConstants.INSTANCE_ROOT_PROPERTY, DEF_LOCATION);
}
// state file
File f = new File(instanceRoot + File.separator + STATE_FILE_NM);
return f;
}
public static void main(String[] args) {
try {
System.setProperty(
SystemPropertyConstants.INSTANCE_ROOT_PROPERTY, "/tmp");
saveState(true);
boolean state = getState();
System.out.println(state);
removeStateFile();
} catch (Exception e) {
e.printStackTrace();
}
}
// ---- INSTANCE VARIABLE(S) - PRIVATE ------------------------------
private static final String STATE_FILE_NM = ".restart-required-state";
private static final String DEF_LOCATION = ".";
}
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