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/*
 * Copyright (c) 2010-2015 Pivotal Software, Inc. All rights reserved.
 *
 * Licensed 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. See accompanying
 * LICENSE file.
 */
package com.gemstone.gemfire.internal.cache.snapshot;

import java.io.File;
import java.io.IOException;
import java.util.Map.Entry;

import junit.framework.TestCase;

import com.gemstone.gemfire.cache.snapshot.SnapshotIterator;
import com.gemstone.gemfire.internal.cache.snapshot.GFSnapshot.GFSnapshotExporter;
import com.gemstone.gemfire.internal.cache.snapshot.GFSnapshot.GFSnapshotImporter;
import com.gemstone.gemfire.internal.cache.snapshot.GFSnapshot.SnapshotWriter;
import com.gemstone.gemfire.internal.cache.snapshot.SnapshotPacket.SnapshotRecord;

public class GFSnapshotJUnitTest extends TestCase {
  private final File f = new File("test.snapshot");
  private static final String val = "Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.";

  public void testStreamWritePerformance() throws IOException {
    int i = 0;
    while (i++ < 10) {
      long start = System.currentTimeMillis();
      int count = 100000;
      
      writeFile(count, val);
      
      long elapsed = System.currentTimeMillis() - start;
      double rate = 1000.0 * count / elapsed;
  
      System.out.println(rate + " stream write operations / sec");
    }
  }

  public void testWritePerformance() throws IOException {
    int j = 0;
    while (j++ < 10) {
      long start = System.currentTimeMillis();
      int count = 100000;
      
      String s = val;
      SnapshotWriter ss = GFSnapshot.create(f, "test");
      try {
        for (int i = 0; i < count; i++) {
          ss.snapshotEntry(new SnapshotRecord(i, s));
        }
      } finally {
        ss.snapshotComplete();
      }
      
      long elapsed = System.currentTimeMillis() - start;
      double rate = 1000.0 * count / elapsed;
  
      System.out.println(rate + " write operations / sec");
    }
  }
  
  public void testStreamReadPerformance() throws IOException,
      ClassNotFoundException {
    writeFile(100000, val);
    
    int i = 0;
    while (i++ < 10) {
      long start = System.currentTimeMillis();
      int count = 0;
  
      GFSnapshotImporter in = new GFSnapshotImporter(f);
      
      SnapshotRecord entry;
      while ((entry = in.readSnapshotRecord()) != null) {
        count++;
      }
      in.close();
      
      long elapsed = System.currentTimeMillis() - start;
      double rate = 1000.0 * count / elapsed;
  
      System.out.println(rate + " stream read operations / sec");
    }
  }
  
  public void testCopyPerformance() throws IOException, ClassNotFoundException {
    int count = 100000;
    for (int i = 0; i < 10; i++) {
      writeFile(count, val);

      File tmp = File.createTempFile("snapshot-copy", null);
      tmp.deleteOnExit();
      
      final SnapshotWriter writer = GFSnapshot.create(tmp, "test");
      
      long start = System.currentTimeMillis();
      SnapshotIterator iter = GFSnapshot.read(f);
      try {
        while (iter.hasNext()) {
          Entry entry = iter.next();
          writer.snapshotEntry(new SnapshotRecord(null, entry));
        }
        writer.snapshotComplete();
        
        long elapsed = System.currentTimeMillis() - start;
        double rate = 1.0 * count / elapsed;
        
        System.out.println("rate = " + rate + " entries / ms");
      } finally {
        iter.close();
      }
    }
  }

  private void writeFile(int count, String s) throws IOException {
    GFSnapshotExporter out = new GFSnapshotExporter(f, "test");

    try {
      for (int i = 0; i < count; i++) {
        out.writeSnapshotEntry(new SnapshotRecord(i, s));
      }
    } finally {
      out.close();
    }
  }
  
  public void tearDown() throws Exception {
    if (f.exists()) {
      f.delete();
    }
  }
}