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Add SystemPropertyUtil.refresh()

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This commit is contained in:
Trustin Lee 2012-09-03 16:08:22 +09:00
parent 5a9d6e59c1
commit 21c9c26ff8
1 changed files with 15 additions and 6 deletions
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21
common/src/main/java/io/netty/util/internal/SystemPropertyUtil.java
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@ -25,25 +25,34 @@ import java.util.Properties;
*/ */
public final class SystemPropertyUtil { public final class SystemPropertyUtil {
private static final InternalLogger logger = private static final Properties props = new Properties();
InternalLoggerFactory.getInstance(SystemPropertyUtil.class); private static final InternalLogger logger;
private static final Properties props;
// Retrieve all system properties at once so that there's no need to deal with // Retrieve all system properties at once so that there's no need to deal with
// security exceptions from next time. Otherwise, we might end up with logging every // security exceptions from next time. Otherwise, we might end up with logging every
// security exceptions on every system property access or introducing more complexity // security exceptions on every system property access or introducing more complexity
// just because of less verbose logging. // just because of less verbose logging.
static { static {
refresh();
logger = InternalLoggerFactory.getInstance(SystemPropertyUtil.class);
}
/**
* Re-retrieves all system properties so that any post-launch properties updates are retrieved.
*/
public static void refresh() {
Properties newProps = null; Properties newProps = null;
try { try {
newProps = System.getProperties(); newProps = System.getProperties();
} catch (SecurityException e) { } catch (SecurityException e) {
logger.warn("Unable to access the system properties; default values will be used.", e); logger.warn("Unable to retrieve the system properties; default values will be used.", e);
newProps = new Properties(); newProps = new Properties();
} }
props = newProps; synchronized (props) {
props.clear();
props.putAll(newProps);
}
} }
/** /**