nizhikov commented on a change in pull request #40:
URL: https://github.com/apache/ignite-extensions/pull/40#discussion_r565093673



##########
File path: 
modules/performance-statistics-ext/src/main/java/org/apache/ignite/internal/performancestatistics/PerformanceStatisticsPrinter.java
##########
@@ -0,0 +1,232 @@
+/*
+ * 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.performancestatistics;
+
+import java.io.BufferedOutputStream;
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.PrintStream;
+import java.util.Arrays;
+import java.util.BitSet;
+import java.util.Iterator;
+import java.util.Set;
+import java.util.stream.Collectors;
+import org.apache.ignite.internal.performancestatistics.handlers.PrintHandler;
+import 
org.apache.ignite.internal.processors.performancestatistics.FilePerformanceStatisticsReader;
+import 
org.apache.ignite.internal.processors.performancestatistics.OperationType;
+import org.apache.ignite.internal.util.typedef.internal.A;
+import org.apache.ignite.internal.util.typedef.internal.CU;
+import org.apache.ignite.internal.util.typedef.internal.U;
+import org.jetbrains.annotations.Nullable;
+
+import static java.util.Collections.singletonList;
+import static java.util.stream.Collectors.joining;
+
+/**
+ * Performance statistics printer.
+ */
+public class PerformanceStatisticsPrinter {
+    /**
+     * @param args Program arguments or '-h' to get usage help.
+     */
+    public static void main(String... args) throws Exception {
+        Parameters params = parseArguments(args);
+
+        validateParameters(params);
+
+        PrintStream ps = printStream(params.outFile);
+
+        try {
+            new FilePerformanceStatisticsReader(
+                new PrintHandler(ps, params.ops, params.from, 
params.to,params.cacheIds))
+                .read(singletonList(new File(params.statFileOrDir)));
+        }
+        finally {
+            if (params.outFile != null)
+                ps.close();
+        }
+    }
+
+    /**
+     * Parses arguments or print help.
+     *
+     * @param args Arguments to parse.
+     * @return Program arguments.
+     */
+    private static Parameters parseArguments(String[] args) {
+        if (args == null || args.length == 0 || 
"--help".equalsIgnoreCase(args[0]) || "-h".equalsIgnoreCase(args[0]))
+            printHelp();
+
+        Parameters params = new Parameters();
+
+        Iterator<String> iter = Arrays.asList(args).iterator();
+
+        params.statFileOrDir = iter.next();
+
+        while (iter.hasNext()) {
+            String arg = iter.next();
+
+            if ("--out".equalsIgnoreCase(arg)) {
+                A.ensure(iter.hasNext(), "Expected output file name");
+
+                params.outFile = iter.next();
+            }
+            else if ("--ops".equalsIgnoreCase(arg)) {
+                A.ensure(iter.hasNext(), "Expected operation types");
+
+                String[] ops = iter.next().split(",");
+
+                A.ensure(ops.length > 0, "Expected at least one operation");
+
+                params.ops = new BitSet();
+
+                for (String op : ops) {
+                    OperationType opType = enumIgnoreCase(op, 
OperationType.class);
+
+                    A.ensure(opType != null, "Unknown operation type [op=" + 
op + ']');
+
+                    params.ops.set(opType.id());
+                }
+            }
+            else if ("--from".equalsIgnoreCase(arg)) {
+                A.ensure(iter.hasNext(), "Expected time from");
+
+                params.from = Long.parseLong(iter.next());
+            }
+            else if ("--to".equalsIgnoreCase(arg)) {
+                A.ensure(iter.hasNext(), "Expected time to");
+
+                params.to = Long.parseLong(iter.next());
+            }
+            else if ("--caches".equalsIgnoreCase(arg)) {
+                A.ensure(iter.hasNext(), "Expected cache names");
+
+                String[] caches = iter.next().split(",");
+
+                A.ensure(caches.length > 0, "Expected at least one cache 
name");
+
+                params.cacheIds = 
Arrays.stream(caches).map(CU::cacheId).collect(Collectors.toSet());
+            }
+            else
+                throw new IllegalArgumentException("Unknown command: " + arg);
+        }
+
+        return params;
+    }
+
+    /** Prints help. */
+    private static void printHelp() {
+        String ops = 
Arrays.stream(OperationType.values()).map(Enum::toString).collect(joining(", 
"));
+
+        System.out.println("The script is used to print performance statistics 
files to the console or file." +
+            U.nl() + U.nl() +
+            "Usage: print-statistics.sh path_to_files [--out out_file] [--ops 
op_types] " +
+            "[--from startTimeFrom] [--to startTimeTo] [--caches cache_names]" 
+ U.nl() +
+            U.nl() +
+            "  path_to_files - Performance statistics file or files 
directory." + U.nl() +
+            "  out_file      - Output file." + U.nl() +
+            "  op_types      - Comma separated list of operation types to 
filter the output." + U.nl() +
+            "  from          - The minimum operation start time to filter the 
output." + U.nl() +
+            "  to            - The maximum operation start time to filter the 
output." + U.nl() +
+            "  cache_names   - Comma separated list of cache names to filter 
the output." + U.nl() +
+            U.nl() +
+            "Times must be specified in the Unix time format in milliseconds." 
+ U.nl() +
+            "List of operation types: " + ops + '.');
+
+        System.exit(0);
+    }
+
+    /** @param params Validates parameters. */
+    private static void validateParameters(Parameters params) {
+        File statFiles = new File(params.statFileOrDir);

Review comment:
       statFiles -> statFileOrDir




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