Package com.caucho.env.deploy

Source Code of com.caucho.env.deploy.ExpandRepositoryManager

/*
* Copyright (c) 1998-2011 Caucho Technology -- all rights reserved
*
* This file is part of Resin(R) Open Source
*
* Each copy or derived work must preserve the copyright notice and this
* notice unmodified.
*
* Resin Open Source is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Resin Open Source is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
* of NON-INFRINGEMENT.  See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with Resin Open Source; if not, write to the
*
*   Free Software Foundation, Inc.
*   59 Temple Place, Suite 330
*   Boston, MA 02111-1307  USA
*
* @author Scott Ferguson
*/

package com.caucho.env.deploy;

import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Map;
import java.util.TreeSet;
import java.util.logging.Logger;

import com.caucho.config.ConfigException;
import com.caucho.env.repository.Repository;
import com.caucho.env.repository.RepositoryService;
import com.caucho.env.repository.RepositoryTagEntry;
import com.caucho.util.Crc64;

/**
* The generator for the deploy
*/
class ExpandRepositoryManager
{
  private final String _tagPrefix;
  private final Repository _repository;

  private TreeSet<String> _keySet = new TreeSet<String>();
 
  private long _digest;
  private Map<String,RepositoryTagEntry> _oldRepositoryMap;

  /**
   * Creates the deploy.
   */
  public ExpandRepositoryManager(String id)
  {
    _tagPrefix = id + "/";
   
    _repository = RepositoryService.getCurrentRepository();
  }

  /**
   * Returns true if the deployment has modified.
   */
  boolean isModified()
  {
    if (_oldRepositoryMap == _repository.getTagMap())
      return false;
    else
      return _digest != calculateDigest();
  }

  /**
   * Log the reason for modification
   */
  boolean logModified(Logger log)
  {
    long digest = calculateDigest();

    if (_digest != digest) {
      log.info(this + " is modified");

      return true;
    }

    return false;
  }
 
  /**
   * Returns the set of deployed keys based on scanning the directory.
   */
  TreeSet<String> getDeployedKeys()
  {
    long oldDigest = _digest;
    TreeSet<String> oldKeys = _keySet;
   
    long newDigest = calculateDigest();
     
    if (oldDigest == newDigest) {
      return oldKeys;
    }
   
    try {
      TreeSet<String> newKeys = scanKeys();
   
      _digest = newDigest;
      _keySet = newKeys;
   
      return newKeys;
    } catch (Exception e) {
      throw ConfigException.create(e);
    }
  }

  public long calculateDigest()
  {
    long digest = 0;
   
    String prefix = _tagPrefix;
   
    ArrayList<String> tags = new ArrayList<String>();
    Map<String,RepositoryTagEntry> tagMap = _repository.getTagMap();

    for (String key : tagMap.keySet()) {
      if (key.startsWith(prefix))
        tags.add(key);
    }

    Collections.sort(tags);

    for (String tag : tags) {
      digest = Crc64.generate(digest, tag);

      RepositoryTagEntry entry = tagMap.get(tag);

      if (entry.getRoot() != null)
        digest = Crc64.generate(digest, entry.getRoot());
    }

    return digest;
  }
 
  /**
   * Return the entry names for all repository objects.
   */
  private TreeSet<String> scanKeys()
    throws IOException
  {
    TreeSet<String> keySet = new TreeSet<String>();
   
    String prefix = _tagPrefix;
   
    Map<String,RepositoryTagEntry> tagMap = _repository.getTagMap();

    for (String tag : tagMap.keySet()) {
      if (tag.startsWith(prefix)) {
        String key = tag.substring(prefix.length());
       
        if (key.indexOf('/') >= 0)
          continue;
       
        keySet.add(key);
      }
    }
   
    return keySet;
  }

  @Override
  public String toString()
  {
    return getClass().getSimpleName() + "[" + _tagPrefix + "]";
  }
}
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