package org.lttng.ust.agent;
+import java.util.Collection;
import java.util.HashSet;
-import java.util.LinkedList;
-import java.util.List;
import java.util.Map;
import java.util.NavigableMap;
import java.util.Set;
/** Number of sessions currently enabling the wildcard "*" event */
private final AtomicInteger enabledWildcards = new AtomicInteger(0);
+ /**
+ * The application contexts currently enabled in the tracing sessions.
+ *
+ * It is first indexed by context retriever, then by context name. This
+ * allows to efficiently query all the contexts for a given retriever.
+ *
+ * Works similarly as {@link #enabledEvents}, but for app contexts (and with
+ * an extra degree of indexing).
+ *
+ * TODO Could be changed to a Guava Table once/if we start using it.
+ */
+ private final Map<String, Map<String, Integer>> enabledAppContexts = new ConcurrentHashMap<String, Map<String, Integer>>();
+
/** Tracing domain. Defined by the sub-classes via the constructor. */
private final Domain domain;
enabledEventPrefixes.clear();
enabledWildcards.set(0);
- initialized = false;
+ enabledAppContexts.clear();
+ initialized = false;
}
@Override
if (eventName.endsWith(WILDCARD)) {
/* Strip the "*" from the name. */
String prefix = eventName.substring(0, eventName.length() - 1);
- return incrementEventCount(prefix, enabledEventPrefixes);
+ return incrementRefCount(prefix, enabledEventPrefixes);
}
- return incrementEventCount(eventName, enabledEvents);
+ return incrementRefCount(eventName, enabledEvents);
}
@Override
if (eventName.endsWith(WILDCARD)) {
/* Strip the "*" from the name. */
String prefix = eventName.substring(0, eventName.length() - 1);
- return decrementEventCount(prefix, enabledEventPrefixes);
+ return decrementRefCount(prefix, enabledEventPrefixes);
}
- return decrementEventCount(eventName, enabledEvents);
+ return decrementRefCount(eventName, enabledEvents);
}
@Override
- public Iterable<String> listEnabledEvents() {
- List<String> events = new LinkedList<String>();
+ public boolean appContextEnabled(String contextRetrieverName, String contextName) {
+ synchronized (enabledAppContexts) {
+ Map<String, Integer> retrieverMap = enabledAppContexts.get(contextRetrieverName);
+ if (retrieverMap == null) {
+ /* There is no submap for this retriever, let's create one. */
+ retrieverMap = new ConcurrentHashMap<String, Integer>();
+ enabledAppContexts.put(contextRetrieverName, retrieverMap);
+ }
- if (enabledWildcards.get() > 0) {
- events.add(WILDCARD);
+ return incrementRefCount(contextName, retrieverMap);
}
- for (String prefix : enabledEventPrefixes.keySet()) {
- events.add(new String(prefix + WILDCARD));
+ }
+
+ @Override
+ public boolean appContextDisabled(String contextRetrieverName, String contextName) {
+ synchronized (enabledAppContexts) {
+ Map<String, Integer> retrieverMap = enabledAppContexts.get(contextRetrieverName);
+ if (retrieverMap == null) {
+ /* There was no submap for this retriever, invalid command? */
+ return false;
+ }
+
+ boolean ret = decrementRefCount(contextName, retrieverMap);
+
+ /* If the submap is now empty we can remove it from the main map. */
+ if (retrieverMap.isEmpty()) {
+ enabledAppContexts.remove(contextRetrieverName);
+ }
+
+ return ret;
}
- events.addAll(enabledEvents.keySet());
- return events;
}
+ /*
+ * Implementation of this method is domain-specific.
+ */
+ @Override
+ public abstract Collection<String> listAvailableEvents();
+
@Override
public boolean isEventEnabled(String eventName) {
/* If at least one session enabled the "*" wildcard, send the event */
return false;
}
- private static boolean incrementEventCount(String eventName, Map<String, Integer> eventMap) {
- synchronized (eventMap) {
- Integer count = eventMap.get(eventName);
+ @Override
+ public Collection<Map.Entry<String, Map<String, Integer>>> getEnabledAppContexts() {
+ return enabledAppContexts.entrySet();
+ }
+
+ private static boolean incrementRefCount(String key, Map<String, Integer> refCountMap) {
+ synchronized (refCountMap) {
+ Integer count = refCountMap.get(key);
if (count == null) {
/* This is the first instance of this event being enabled */
- eventMap.put(eventName, Integer.valueOf(1));
+ refCountMap.put(key, Integer.valueOf(1));
return true;
}
if (count.intValue() <= 0) {
throw new IllegalStateException();
}
/* The event was already enabled, increment its refcount */
- eventMap.put(eventName, Integer.valueOf(count.intValue() + 1));
+ refCountMap.put(key, Integer.valueOf(count.intValue() + 1));
return true;
}
}
- private static boolean decrementEventCount(String eventName, Map<String, Integer> eventMap) {
- synchronized (eventMap) {
- Integer count = eventMap.get(eventName);
+ private static boolean decrementRefCount(String key, Map<String, Integer> refCountMap) {
+ synchronized (refCountMap) {
+ Integer count = refCountMap.get(key);
if (count == null || count.intValue() <= 0) {
/*
* The sessiond asked us to disable an event that was not
* This is the last instance of this event being disabled,
* remove it from the map so that we stop sending it.
*/
- eventMap.remove(eventName);
+ refCountMap.remove(key);
return true;
}
/*
* Other sessions are still looking for this event, simply decrement
* its refcount.
*/
- eventMap.put(eventName, Integer.valueOf(count.intValue() - 1));
+ refCountMap.put(key, Integer.valueOf(count.intValue() - 1));
return true;
}
}
projects / lttng-ust.git / blobdiff