CacheClient.java :  » Web-Server » xsocket » org » xcache » Java Open Source

package org.xcache;

import java.io.IOException;
import java.util.Collection;
import java.util.Map;
import java.util.Set;
import java.util.logging.Level;
import java.util.logging.Logger;

import net.sf.jsr107cache.Cache;
import net.sf.jsr107cache.CacheEntry;
import net.sf.jsr107cache.CacheException;
import net.sf.jsr107cache.CacheListener;
import net.sf.jsr107cache.CacheStatistics;

import org.xsocket.stream.IBlockingConnection;



final class CacheClient implements Cache {
  
  private static final Logger LOG = Logger.getLogger(CacheClient.class.getName());

  private ICacheServerLocator locator = null;
  
  
  public CacheClient(ICacheServerLocator locator) {
    this.locator = locator;
  }
  
  ICacheServerLocator getLocator() {
    return locator;
  }
  
  public Object put(Object key, Object value) {
    
    Object result = null;
    
    Item keyItem = new Item(key);
    Item valueItem = new Item(value);
    
    int segment = locator.computeSegement(key);
    
    IBlockingConnection connection = null;
    try {
      Address address = locator.getServiceAddress(segment);
      connection = ConnectionPool.getInstance().getConnection(address);
      
      connection.markWritePosition();
      connection.write((int) 0); // emtpy length field
      int length = 0;
      
      length += connection.write(CacheServer.CMD_PUT);
      length += connection.write(segment);
      length += keyItem.writeTo(connection);
      length += valueItem.writeTo(connection);
      
      connection.resetToWriteMark();
      connection.write(length);
      
      connection.flush();
      
      connection.readInt();  // first position is length
      byte response = connection.readByte();
      if (response == CacheServer.RESULT_OK_WITHOUT_RETURNVALUE) {
        result = null;
        
      } else if (response == CacheServer.RESULT_OK_WITH_RETURNVALUE) {
        Item oldValue = Item.readFrom(connection);
        result = oldValue.getValue();
        
      } else {
        throw new RuntimeException("unexpected result");
      }
      
      if (LOG.isLoggable(Level.FINE)) {
        LOG.fine("item for key " + key + " (segment " + segment + ") has been inserted (cache server " + connection.getRemoteAddress() + "/" + connection.getRemotePort() + ")");
      }
      connection.close();
      
    } catch (Exception e) {
      if (connection != null) {
        try {
          ConnectionPool.getInstance().destroyConnection(connection);
        } catch (IOException ignore) { }; 
      }
      throw new RuntimeException("error occured by put " + key +  " into the cache. Reason: " + e.toString());
    }    
    return result;
  }
  
  public Object get(Object key) {
  Object result = null;
    
    Item keyItem = new Item(key);
    
    int segment = locator.computeSegement(key);
    
    IBlockingConnection connection = null;
    try {
      Address address = locator.getServiceAddress(segment);
      connection = ConnectionPool.getInstance().getConnection(address);

      connection.markWritePosition();
      connection.write((int) 0); // emtpy length field
      int length = 0;
      
      length += connection.write(CacheServer.CMD_GET);
      
      length += connection.write(segment);
      length += keyItem.writeTo(connection);
      
      connection.resetToWriteMark();
      connection.write(length);
      
      connection.flush();
      
      connection.readInt();  // first position is length
      byte response = connection.readByte();
      
      if (response == CacheServer.RESULT_OK_WITHOUT_RETURNVALUE) {
        result = null;

      } else if (response == CacheServer.RESULT_OK_WITH_RETURNVALUE) {
        Item value = Item.readFrom(connection);
        result = value.getValue();
        
      } else {
        throw new RuntimeException("unexpected result");
      }
      
      if (LOG.isLoggable(Level.FINE)) {
        if (result != null) {
          LOG.fine("item for key " + key + " (segment " + segment + ") has retrieved (cache server " + connection.getRemoteAddress() + "/" + connection.getRemotePort() + ")");
        } else {
          LOG.fine("no item for key " + key + " (segment " + segment + ") found on server (cache server " + connection.getRemoteAddress() + "/" + connection.getRemotePort() + ")");
        }
      }
      
      connection.close();
      
    } catch (Exception e) {
      if (connection != null) {
        try {
          ConnectionPool.getInstance().destroyConnection(connection);
        } catch (IOException ignore) { }; 
      }
      throw new RuntimeException("error occured by put " + key +  " into the cache. Reason: " + e.toString());
    }    
    return result;
  }
  
  

  public boolean containsKey(Object key) {
    // TODO Auto-generated method stub
    return false;
  }
  
  public boolean containsValue(Object value) {
    // TODO Auto-generated method stub
    return false;
  }
  
  public Set entrySet() {
    // TODO Auto-generated method stub
    return null;
  }
  
  
  public Map getAll(Collection keys) throws CacheException {
    // TODO Auto-generated method stub
    return null;
  }
  
  public CacheEntry getCacheEntry(Object key) {
    // TODO Auto-generated method stub
    return null;
  }
  
  public CacheStatistics getCacheStatistics() {
    // TODO Auto-generated method stub
    return null;
  }
  
  public boolean isEmpty() {
    // TODO Auto-generated method stub
    return false;
  }
  
  
  public Set keySet() {
    // TODO Auto-generated method stub
    return null;
  }
  
  public void load(Object key) throws CacheException {
    // TODO Auto-generated method stub
    
  }
  
  public void loadAll(Collection keys) throws CacheException {
    // TODO Auto-generated method stub
    
  }
  
  public Object peek(Object key) {
    // TODO Auto-generated method stub
    return null;
  }
  
  public void putAll(Map t) {
    // TODO Auto-generated method stub
    
  }
  
  public Object remove(Object key) {
    // TODO Auto-generated method stub
    return null;
  }
  
  public int size() {
    // TODO Auto-generated method stub
    return 0;
  }
  
  
  
  
  public void evict() {
    // TODO Auto-generated method stub
    
  }
  
  
  public void clear() {
    // TODO Auto-generated method stub
    
  }

  public Collection values() {
    // TODO Auto-generated method stub
    return null;
  }
  
  
  
  
  public void addListener(CacheListener listener) {
    // TODO Auto-generated method stub
    
  }
  
  public void removeListener(CacheListener listener) {
    // TODO Auto-generated method stub
    
  }
}