Remove caching of hostname detection in config class
MODIFY
dd-trace-api/src/main/java/datadog/trace/api/Config.java
dd-trace-api/src/main/java/datadog/trace/api/Config.java
@@ -322,8 +322,10 @@ public class Config {
/** @return A map of tags to be applied only to the local application root span. */
public Map<String, String> getLocalRootSpanTags() {
- final Map<String, String> result = newHashMap(reportHostName ? 1 : 0);
- result.putAll(getRuntimeTags());
+ final Map<String, String> runtimeTags = getRuntimeTags();
+ final Map<String, String> result =
+ newHashMap(reportHostName ? (runtimeTags.size() + 1) : runtimeTags.size());
+ result.putAll(runtimeTags);
if (reportHostName) {
result.put(INTERNAL_HOST_NAME, getHostname());
}
@@ -662,26 +664,18 @@ public class Config {
return Collections.unmodifiableSet(result);
}
- // Fields used to cache detected hostName which is a time consuming operation.
- private String hostName = null;
- private boolean hostNameDetected = false;
-
/**
- * Returns the detected hostname. This operation is time consuming and the first time this method
- * is called will take some time. Hostname is cached for subsequent calls.
+ * Returns the detected hostname. This operation is time consuming so if the usage changes and
+ * this method will be called several times then we should implement some sort of caching.
*/
- public String getHostname() {
- if (!this.hostNameDetected) {
+ private String getHostname() {
try {
- this.hostName = InetAddress.getLocalHost().getHostName();
+ return InetAddress.getLocalHost().getHostName();
} catch (UnknownHostException e) {
// If we are not able to detect the hostname we do not throw an exception.
- } finally {
- this.hostNameDetected = true;
- }
}
- return this.hostName;
+ return null;
}
// This has to be placed after all other static fields to give them a chance to initialize

Remove caching of hostname detection in config class