Github user arina-ielchiieva commented on a diff in the pull request:
https://github.com/apache/drill/pull/574#discussion_r78291908
--- Diff:
exec/java-exec/src/main/java/org/apache/drill/exec/expr/fn/DrillFunctionRegistry.java
---
@@ -218,4 +302,141 @@ private void
registerOperatorsWithoutInference(DrillOperatorTable operatorTable)
}
}
}
+
+ /**
+ * Function registry holder. Stores function implementations by jar
name, function name.
+ */
+ private class GenericRegistryHolder<T, U> {
+ private final ReadWriteLock readWriteLock = new
ReentrantReadWriteLock();
+ private final AutoCloseableLock readLock = new
AutoCloseableLock(readWriteLock.readLock());
+ private final AutoCloseableLock writeLock = new
AutoCloseableLock(readWriteLock.writeLock());
+
+ // jar name, Map<function name, List<signature>
+ private final Map<T, Map<T, List<T>>> jars;
+
+ // function name, Map<signature, function holder>
+ private final Map<T, Map<T, U>> functions;
+
+ public GenericRegistryHolder() {
+ this.functions = Maps.newHashMap();
+ this.jars = Maps.newHashMap();
+ }
+
+ public void addJar(T jName, Map<T, Pair<T, U>> sNameMap) {
+ try (AutoCloseableLock lock = writeLock.open()) {
+ Map<T, List<T>> map = jars.get(jName);
+ if (map != null) {
+ removeAllByJar(jName);
+ }
+ map = Maps.newHashMap();
+ jars.put(jName, map);
+
+ for (Entry<T, Pair<T, U>> entry : sNameMap.entrySet()) {
+ T sName = entry.getKey();
+ Pair<T, U> pair = entry.getValue();
+ addFunction(jName, pair.getKey(), sName, pair.getValue());
+ }
+ }
+ }
+
+ public void removeJar(T jName) {
+ try (AutoCloseableLock lock = writeLock.open()) {
+ removeAllByJar(jName);
+ }
+ }
+
+ public List<T> getAllJarNames() {
+ try (AutoCloseableLock lock = readLock.open()) {
+ return Lists.newArrayList(jars.keySet());
+ }
+ }
+
+ public List<T> getAllFunctionNames(T jName) {
+ try (AutoCloseableLock lock = readLock.open()){
+ Map<T, List<T>> map = jars.get(jName);
+ return map == null ? Lists.<T>newArrayList() :
Lists.newArrayList(map.keySet());
+ }
+ }
+
+ public ListMultimap<T, U> getAllFunctionsWithHolders() {
+ try (AutoCloseableLock lock = readLock.open()) {
+ ListMultimap<T, U> multimap = ArrayListMultimap.create();
+ for (Entry<T, Map<T, U>> entry : functions.entrySet()) {
+ multimap.putAll(entry.getKey(),
Lists.newArrayList(entry.getValue().values()));
+ }
+ return multimap;
+ }
+ }
+
+ public ListMultimap<T, T> getAllFunctionsWithSignatures() {
+ try (AutoCloseableLock lock = readLock.open()) {
+ ListMultimap<T, T> multimap = ArrayListMultimap.create();
+ for (Entry<T, Map<T, U>> entry : functions.entrySet()) {
+ multimap.putAll(entry.getKey(),
Lists.newArrayList(entry.getValue().keySet()));
+ }
+ return multimap;
+ }
+ }
+
+ public List<U> getHoldersByFunctionName(T fName) {
+ try (AutoCloseableLock lock = readLock.open()) {
+ Map<T, U> map = functions.get(fName);
+ return map == null ? Lists.<U>newArrayList() :
Lists.newArrayList(map.values());
+ }
+ }
+
+ public boolean containsJar(T jName) {
+ try (AutoCloseableLock lock = readLock.open()) {
+ return jars.containsKey(jName);
+ }
+ }
+
+ public int functionsSize() {
+ try (AutoCloseableLock lock = readLock.open()) {
+ return functions.size();
+ }
+ }
+
+ private void addFunction(T jName, T fName, T sName, U fHolder) {
+ Map<T, List<T>> map = jars.get(jName);
+
+ List<T> list = map.get(fName);
+ if (list == null) {
+ list = Lists.newArrayList();
+ map.put(fName, list);
+ }
+
+ if (!list.contains(sName)) {
+ list.add(sName);
+
+ Map<T, U> sigsMap = functions.get(fName);
+ if (sigsMap == null) {
+ sigsMap = Maps.newHashMap();
+ functions.put(fName, sigsMap);
+ }
+
+ U u = sigsMap.get(sName);
+ if (u == null) {
+ sigsMap.put(sName, fHolder);
+ }
+ }
+ }
+
+ private void removeAllByJar(T jName) {
+ Map<T, List<T>> removeMap = jars.remove(jName);
+ if (removeMap == null) {
+ return;
+ }
+
+ for (Map.Entry<T, List<T>> remEntry : removeMap.entrySet()) {
+ Map<T, U> fNameMap = functions.get(remEntry.getKey());
+ List<T> value = remEntry.getValue();
+ fNameMap.keySet().removeAll(value);
--- End diff --
Yes, removing key from keySet will the whole entry (key + value) from map,
since keySet is backed by the map, so changes to the map are reflected in the
set, and vice-versa.
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