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From GitBox <...@apache.org>
Subject [GitHub] [ignite] alex-plekhanov commented on a change in pull request #6916: IGNITE-12213: Sql objects system views.
Date Wed, 02 Oct 2019 09:41:07 GMT
alex-plekhanov commented on a change in pull request #6916: IGNITE-12213: Sql objects system
views.
URL: https://github.com/apache/ignite/pull/6916#discussion_r330453659
 
 

 ##########
 File path: modules/core/src/main/java/org/apache/ignite/internal/managers/systemview/SystemViewCollectionContainerAdapter.java
 ##########
 @@ -0,0 +1,109 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.ignite.internal.managers.systemview;
+
+import java.util.Collection;
+import java.util.Iterator;
+import java.util.function.BiFunction;
+import java.util.function.Function;
+import org.apache.ignite.spi.systemview.view.SystemView;
+import org.apache.ignite.spi.systemview.view.SystemViewRowAttributeWalker;
+import org.jetbrains.annotations.NotNull;
+
+import static java.util.Collections.emptyIterator;
+
+/**
+ * System view backed by {@code data} container.
+ * Each instance of {@code containers} collections should provide a collection of data.
+ *
+ * @see SystemView
+ */
+public class SystemViewCollectionContainerAdapter<C, R, D> extends AbstractSystemView<R>
{
+    /** Collections of the data containers */
+    private final Collection<C> containers;
+
+    /** Function to extract collection of the data from container. */
+    private final Function<C, Collection<D>> dataExtractor;
+
+    /** Row function. */
+    private final BiFunction<C, D, R> rowFunc;
+
+    /**
+     * @param name Name.
+     * @param desc Description.
+     * @param rowCls Row class.
+     * @param walker Walker.
+     * @param containers Container of data.
+     * @param dataExtractor Data extractor function.
+     * @param rowFunc Row function.
+     */
+    public SystemViewCollectionContainerAdapter(String name, String desc, Class<R>
rowCls,
+        SystemViewRowAttributeWalker<R> walker,
+        Collection<C> containers,
+        Function<C, Collection<D>> dataExtractor,
+        BiFunction<C, D, R> rowFunc) {
+        super(name, desc, rowCls, walker);
+
+        this.containers = containers;
+        this.dataExtractor = dataExtractor;
+        this.rowFunc = rowFunc;
+    }
+
+    /** {@inheritDoc} */
+    @Override public int size() {
+        int sz = 0;
+
+        for (C c : containers)
+            sz += dataExtractor.apply(c).size();
+
+        return sz;
+    }
+
+    /** {@inheritDoc} */
+    @NotNull @Override public Iterator<R> iterator() {
+        return new Iterator<R>() {
 
 Review comment:
   I think it can be simplified by using `F.concat(F.iterator(...))`

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