GWT+GAE TodoMVCCommand.java
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package com.todomvc.shared.command;

import java.io.Serializable;

import com.todomvc.shared.model.HasID;
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Command acting on an object of type T. 

public interface Command<T extends HasID> extends Serializable {
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Eager commands are evaluated on the client before sending to the server. When non eager, the one sent back from the server is executed instead.

    boolean isEager();
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Execute the command on target. 

    void execute(T target);
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Whether the command can proceed to execute on target. 

    boolean canExecuteOn(T target);
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Gets the type of command, used to determine which executor should execute the command. 

    String getCommandType();
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Gets the ID that uniquely identifies the object (which HasID) on which this command executes on.

    String getTargetId();

}