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From paul-rogers <...@git.apache.org>
Subject [GitHub] drill pull request #574: DRILL-4726: Dynamic UDFs support
Date Tue, 06 Sep 2016 19:44:58 GMT
Github user paul-rogers commented on a diff in the pull request:

    https://github.com/apache/drill/pull/574#discussion_r77704648
  
    --- 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) {
    --- End diff --
    
    How is this used? It is not thread-safe: we check if jar exists at time T, but by the
time we use the information at time T+1, some other thread mave inserted the jar.


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