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Micro Distribution of the Payara Project for IBM JDK
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package com.sun.enterprise.config.serverbeans;
import org.jvnet.hk2.config.Element;
import org.jvnet.hk2.config.DuckTyped;
import org.jvnet.hk2.config.ConfigBeanProxy;
import org.jvnet.hk2.config.types.PropertyBag; //used only for Javadoc purpose {@link}
import java.util.List;
import java.beans.PropertyVetoException;
/** Factored out the list of jvm-options from at least two other interfaces that have them: java-config and profiler.
* Similar to {@link PropertyBag}
*/
public interface JvmOptionBag extends ConfigBeanProxy {
@Element
public List getJvmOptions();
void setJvmOptions(List options) throws PropertyVetoException;
/** It's observed that many a time we need the value of max heap size. This is useful when deciding if a
* user is misconfiguring the JVM by specifying -Xmx that is smaller than -Xms. Sun's JVM for example,
* bails out with Incompatible minimum and maximum heap sizes specified when that happens.
* It's generally better to do some basic validations in those cases and that's when this method may be useful.
* @return an integer specifying the actual max heap memory (-Xmx) configured. If it's specified as -Xmx2g, then 2*1024
* i.e. 2048 is returned. Returns -1 if no -Xmx is specified.
*/
@DuckTyped
int getXmxMegs();
/** see #getXmxMegs
* @return integer specifying -Xms in megabytes, or -1*/
@DuckTyped
int getXmsMegs();
@DuckTyped
boolean contains(String option);
@DuckTyped
String getStartingWith(String start);
class Duck {
/* Note: It does not take defaults into account. Also,
* I have tested that server does not start with a heap that is less than 1m, so I think I don't have to worry about
* -Xmx that is specified to be less than 1 MB. Again, there is lots and lots of platform dependent code here,
* so this check should be minimal. Again, I am doing this kind of check here because while testing, I was
* able to get into a situation where -Xmx is configured smaller than -Xms and the server won't start. The user
* then must edit the domain.xml by hand!
*/
public static int getXmxMegs(JvmOptionBag me) {
return getMemory(me, "-Xmx");
}
public static int getXmsMegs(JvmOptionBag me) {
return getMemory(me, "-Xms");
}
private static int getMemory(JvmOptionBag me, String which) {
List options = me.getJvmOptions();
for (String opt : options) {
if(opt.indexOf(which) >= 0) {
return toMeg(opt, which);
}
}
return -1;
}
public static int toMeg(String whole, String which) {
String first = whole.substring(0, which.length());
String second = whole.substring(which.length());
if (first == null || second == null)
return -1;
char unit = second.charAt(second.length()-1);
try {
if (unit =='g' || unit == 'G')
return Integer.parseInt(second.substring(0, second.length()-1)) * 1024; //I don't think we'll have an overflow
else if (unit == 'm' || unit == 'M')
return Integer.parseInt(second.substring(0, second.length()-1));
else if (unit == 'k' || unit == 'K')
return Integer.parseInt(second.substring(0, second.length()-1)) / 1024; //beware, integer division
else
return Integer.parseInt(second) / (1024*1024); //bytes, this is a rare case, hopefully -- who does -Xmx1073741824 to specify a meg?
} catch(NumberFormatException e) {
//squelch all exceptions
return -1;
} catch(RuntimeException e) {
//squelch all exceptions
return -1;
}
}
public static boolean contains(JvmOptionBag me, String opt) {
return me.getJvmOptions().contains(opt);
}
public static String getStartingWith(JvmOptionBag me, String start) {
List opts = me.getJvmOptions();
for (String opt : opts) {
if (opt.startsWith(start))
return opt;
}
return null;
}
}
}
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