// Copyright 2012 Citrix Systems, Inc. Licensed under the
// Apache License, Version 2.0 (the "License"); you may not use this
// file except in compliance with the License.  Citrix Systems, Inc.
// reserves all rights not expressly granted by 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.
// 
// Automatically generated by addcopyright.py at 04/03/2012
package com.cloud.agent.api;

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

import com.cloud.agent.api.LogLevel.Log4jLevel;

/**
 * implemented by classes that extends the Command class. Command specifies
 * 
 */
public abstract class Command { 

    // allow command to carry over hypervisor or other environment related context info
    @LogLevel(Log4jLevel.Trace)
    protected Map<String, String> contextMap = new HashMap<String, String>();
    private int wait;  //in second

    protected Command() {
        this.wait = 0;
    }

    public int getWait() {
        return wait;
    }

    public void setWait(int wait) {
        this.wait = wait;
    }

    @Override
    public final String toString() {
        return this.getClass().getName();
    }

    /**
     * @return Does this command need to be executed in sequence on the agent?
     *         When this is set to true, the commands are executed by a single
     *         thread on the agent.
     */
    public abstract boolean executeInSequence();

    public void setContextParam(String name, String value) {
        contextMap.put(name, value);
    }

    public String getContextParam(String name) {
        return contextMap.get(name);
    }
    
    public boolean allowCaching() {
        return true;
    }
}