Author: thomasm
Date: Fri Dec  2 16:22:22 2011
New Revision: 1209559

URL: http://svn.apache.org/viewvc?rev=1209559&view=rev
Log:
A tool to create an arbitrary large tree of nested nodes.

Added:
    jackrabbit/sandbox/microkernel/src/test/java/org/apache/jackrabbit/mk/util/NodeCreator.java

Added: jackrabbit/sandbox/microkernel/src/test/java/org/apache/jackrabbit/mk/util/NodeCreator.java
URL: http://svn.apache.org/viewvc/jackrabbit/sandbox/microkernel/src/test/java/org/apache/jackrabbit/mk/util/NodeCreator.java?rev=1209559&view=auto
==============================================================================
--- jackrabbit/sandbox/microkernel/src/test/java/org/apache/jackrabbit/mk/util/NodeCreator.java (added)
+++ jackrabbit/sandbox/microkernel/src/test/java/org/apache/jackrabbit/mk/util/NodeCreator.java Fri Dec  2 16:22:22 2011
@@ -0,0 +1,131 @@
+/*
+ * 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.jackrabbit.mk.util;
+
+import org.apache.jackrabbit.mk.api.MicroKernel;
+
+/**
+ * A utility to create a (large) number of nodes in a tree structure.
+ */
+public class NodeCreator {
+
+    private final MicroKernel mk;
+    private String head;
+    private int totalCount = 200;
+    private int width = 30, count;
+    private StopWatch timer;
+    private String nodeName = "test";
+    private String data = "Hello World";
+
+    public NodeCreator(MicroKernel mk) {
+        this.mk = mk;
+        head = mk.getHeadRevision();
+    }
+
+    public void setWidth(int width) {
+        this.width = width;
+    }
+
+    public void setTotalCount(int totalCount) {
+        this.totalCount = totalCount;
+    }
+
+    public void setNodeName(String nodeName) {
+        this.nodeName = nodeName;
+    }
+
+    public void setData(String data) {
+        this.data = data;
+    }
+
+    public void create() {
+        head = mk.commit("/", "+\"" + nodeName + "\":{}", head, "");
+        timer = new StopWatch();
+        count = 0;
+        int depth = (int) Math.ceil(Math.log(totalCount) / Math.log(width));
+        log("depth: " + depth);
+        createNodes(nodeName, depth);
+        log("created  " + count + " nodes in " + timer.operationsPerSecond(count));
+    }
+
+    public void traverse() {
+        timer = new StopWatch();
+        count = 0;
+        int depth = (int) Math.ceil(Math.log(totalCount) / Math.log(width));
+        log("depth: " + depth);
+        traverse(nodeName, depth);
+        log("read  " + count + " nodes in " + timer.operationsPerSecond(count));
+    }
+
+    private void createNodes(String parent, int depth) {
+        if (count >= totalCount) {
+            return;
+        }
+        StringBuilder buff = new StringBuilder();
+        for (int i = 0; i < width; i++) {
+            if (count >= totalCount && depth == 0) {
+                break;
+            }
+            String p = parent + "/node" + depth + i;
+            buff.append("+ \"" + p + "\": {");
+            if (data != null) {
+                buff.append("\"data\":\"").append(data).append(" ").
+                    append(count).append("\"");
+            }
+            count++;
+            buff.append("}\n");
+            if (count % 1000 == 0 && timer.log()) {
+                log("  " + count + " nodes in " + timer.operationsPerSecond(count));
+            }
+        }
+        head = mk.commit("/", buff.toString(), head, "");
+        if (depth > 0) {
+            for (int i = 0; i < width; i++) {
+                String p = parent + "/node" + depth + i;
+                createNodes(p, depth - 1);
+            }
+        }
+    }
+
+    private void traverse(String parent, int depth) {
+        if (count >= totalCount) {
+            return;
+        }
+        for (int i = 0; i < width; i++) {
+            if (count >= totalCount && depth == 0) {
+                break;
+            }
+            String p = parent + "/node" + depth + i;
+            if (!mk.nodeExists("/" + p, head)) {
+                break;
+            }
+            mk.getNodes("/" + p, head);
+            count++;
+            if (count % 1000 == 0 && timer.log()) {
+                log("  " + count + " nodes in " + timer.operationsPerSecond(count));
+            }
+            if (depth > 0) {
+                traverse(p, depth - 1);
+            }
+        }
+    }
+
+    private void log(String s) {
+        // System.out.println(s);
+    }
+
+}