MyProxyStore

import java.util.HashMap;
import java.util.Map;

import com.google.web.bindery.autobean.shared.AutoBean;
import com.google.web.bindery.autobean.shared.AutoBeanCodex;
import com.google.web.bindery.autobean.shared.Splittable;
import com.google.web.bindery.requestfactory.shared.ProxyStore;
import com.google.web.bindery.requestfactory.shared.impl.MessageFactoryHolder;
import com.google.web.bindery.requestfactory.shared.messages.OperationMessage;


/*
 * Patched version of DefaultProxyStore that
 * always returns a unique id.
 */
public class MyProxyStore implements ProxyStore {
	  /**
	   * Provide a little bit of future-proofing to at least detect an encoded
	   * payload that can't be decoded.
	   */
	  private static final String EXPECTED_VERSION = "211";
	  private final AutoBean<OperationMessage> messageBean;
	  private final Map<String, Splittable> map;
	  private int curId = 0;

	  /**
	   * Construct an empty DefaultProxyStore.
	   */
	  public MyProxyStore() {
	    messageBean = MessageFactoryHolder.FACTORY.operation();
	    map = new HashMap<String, Splittable>();

	    OperationMessage message = messageBean.as();
	    message.setPropertyMap(map);
	    message.setVersion(EXPECTED_VERSION);
	  }

	  /**
	   * Construct a DefaultProxyStore using the a value returned from
	   * {@link #encode()}.
	   *
	   * @param payload a String previously returned from {@link #encode()}
	   * @throws IllegalArgumentException if the payload cannot be parsed
	   */
	  public MyProxyStore(String payload) throws IllegalArgumentException {
	    messageBean =
	        AutoBeanCodex.decode(MessageFactoryHolder.FACTORY, OperationMessage.class, payload);

	    OperationMessage message = messageBean.as();
	    if (!EXPECTED_VERSION.equals(message.getVersion())) {
	      throw new IllegalArgumentException("Unexpected version string in payload "
	          + message.getVersion());
	    }
	    map = message.getPropertyMap();
	  }

	  /**
	   * Return a JSON object literal with the contents of the store.
	   */
	  public String encode() {
	    return AutoBeanCodex.encode(messageBean).getPayload();
	  }

	  public Splittable get(String key) {
	    return map.get(key);
	  }

	  public int nextId() {
	    return curId++;
	  }

	  public void put(String key, Splittable value) {
	    map.put(key, value);
	  }
	}