Github user paul-rogers commented on a diff in the pull request:
https://github.com/apache/drill/pull/574#discussion_r77705479
--- 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);
--- End diff --
Does the signature include the method name? If so, how can we have multiple
functions with the same signature? The SQL function name space is flat, so
there is no way to tell the difference between my.foo(int) and your.foo(int),
they are both just foo, aren't they?
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