/**
* Configure the history length for a specific entry. If the length is 0 disable history for this
* key
*
* @param pKey history key
* @param pMaxEntries number of maximal entries. If larger than globalMaxEntries, then
* globalMaxEntries is used instead.
*/
public synchronized void configure(HistoryKey pKey, int pMaxEntries) {
int maxEntries = pMaxEntries > globalMaxEntries ? globalMaxEntries : pMaxEntries;
// Remove entries if set to 0
if (pMaxEntries == 0) {
removeEntries(pKey);
return;
}
if (pKey.isMBeanPattern()) {
patterns.put(pKey, maxEntries);
// Trim all already stored keys
for (HistoryKey key : historyStore.keySet()) {
if (pKey.matches(key)) {
HistoryEntry entry = historyStore.get(key);
entry.setMaxEntries(maxEntries);
entry.trim();
}
}
} else {
HistoryEntry entry = historyStore.get(pKey);
if (entry != null) {
entry.setMaxEntries(maxEntries);
entry.trim();
} else {
entry = new HistoryEntry(maxEntries);
historyStore.put(pKey, entry);
}
}
}
private HistoryEntry getEntry(HistoryKey pKey, Object pValue, long pTimestamp) {
HistoryEntry entry = historyStore.get(pKey);
if (entry != null) {
return entry;
}
// Now try all known patterns and add lazily the key
for (HistoryKey key : patterns.keySet()) {
if (key.matches(pKey)) {
entry = new HistoryEntry(patterns.get(key));
entry.add(pValue, pTimestamp);
historyStore.put(pKey, entry);
return entry;
}
}
return null;
}
// Remove entries
private void removeEntries(HistoryKey pKey) {
if (pKey.isMBeanPattern()) {
patterns.remove(pKey);
List<HistoryKey> toRemove = new ArrayList<HistoryKey>();
for (HistoryKey key : historyStore.keySet()) {
if (pKey.matches(key)) {
toRemove.add(key);
}
}
// Avoid concurrent modification exceptions
for (HistoryKey key : toRemove) {
historyStore.remove(key);
}
} else {
HistoryEntry entry = historyStore.get(pKey);
if (entry != null) {
historyStore.remove(pKey);
}
}
}