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added synchroniztion for ArrayLists: agents and domains

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This commit is contained in:
Bill Tantzen
2014-12-11 12:39:33 -06:00
parent 845532b29d
commit c70f99895c
1 changed files with 16 additions and 12 deletions
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28
dspace-api/src/main/java/org/dspace/statistics/util/SpiderDetector.java
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@@ -15,6 +15,7 @@ import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.Collections;
import java.util.regex.Pattern;
import javax.servlet.http.HttpServletRequest;
import org.dspace.core.ConfigurationManager;
@@ -42,10 +43,10 @@ public class SpiderDetector {
private static IPTable table = null;
/** Collection of regular expressions to match known spiders' agents. */
private static List<Pattern> agents = new ArrayList<Pattern>();
private static List<Pattern> agents = Collections.synchronizedList(new ArrayList<Pattern>());
/** Collection of regular expressions to match known spiders' domain names. */
private static List<Pattern> domains = new ArrayList<Pattern>();
private static List<Pattern> domains = Collections.synchronizedList(new ArrayList<Pattern>());
/**
* Utility method which reads lines from a file & returns them in a Set.
@@ -199,13 +200,15 @@ public class SpiderDetector {
{
// See if any agent patterns match
if (null != agent)
{
if (agents.isEmpty())
loadPatterns("agents", agents);
{
synchronized(agents)
{
if (agents.isEmpty())
loadPatterns("agents", agents);
}
for (Pattern candidate : agents)
{
// prevent matcher() invocation from a null Pattern object
// prevent matcher() invocation from a null Pattern object
if (null != candidate && candidate.matcher(agent).find())
{
return true;
@@ -230,15 +233,16 @@ public class SpiderDetector {
// No. See if any DNS names match
if (null != hostname)
{
synchronized(domains) {
if (domains.isEmpty())
{
loadPatterns("domains", domains);
{
loadPatterns("domains", domains);
}
}
for (Pattern candidate : domains)
{
// prevent matcher() invocation from a null Pattern object
if (null != candidate && candidate.matcher(hostname).find())
// prevent matcher() invocation from a null Pattern object
if (null != candidate && candidate.matcher(hostname).find())
{
return true;
}