【深蓝】Volley之Request 2

Request

Volley中的请求对象,而Network 就是请求Request的。

 

Request构造

	public Request(int method, String url, Response.ErrorListener listener) {
		mMethod = method;
		mUrl = url;
		mErrorListener = listener;
		setRetryPolicy(new DefaultRetryPolicy());

		mDefaultTrafficStatsTag = findDefaultTrafficStatsTag(url);
	}

　　创建一个请求；这个需要有请求方式：method。GET POST 之类的，然后请求的url. 还有一个就是。如果请求成功回调的方法，listener，请求失败回掉的方法listener 执行他的。

其中setRetryPolicy()为重试策略，（这边还没有看，猜测 就是如果没有连接成功 重新连接的策略）

mDefaultTrafficStatsTag 先判断Url是否为空，如果不为空，判断Uri.parse(url);是否能转换成uri 转换成功后返回uri字符串.Hashcode(); 

 

然后再根据一系列的操作，从这个请求中network读取对应的信息：

 

/**
     * Request method of this request. Currently supports GET, POST, PUT,
     * DELETE, HEAD, OPTIONS, TRACE, and PATCH.
     */
    private final int mMethod;

    /** URL of this request. */
    private final String mUrl;

    /** Default tag for {@link TrafficStats}. */
    private final int mDefaultTrafficStatsTag;  

    /** Listener interface for errors. */
    private final Response.ErrorListener mErrorListener;

    /** Sequence number of this request, used to enforce FIFO ordering. */
    private Integer mSequence;

    /** The request queue this request is associated with. */
    private RequestQueue mRequestQueue;

    /** Whether or not responses to this request should be cached. */
    private boolean mShouldCache = true;

    /** Whether or not this request has been canceled. */
    private boolean mCanceled = false;

    /** Whether or not a response has been delivered for this request yet. */
    private boolean mResponseDelivered = false;

    // A cheap variant of request tracing used to dump slow requests.
    private long mRequestBirthTime = 0;

    /**
     * Threshold at which we should log the request (even when debug logging is
     * not enabled).
     */
    private static final long SLOW_REQUEST_THRESHOLD_MS = 3000;

    /** The retry policy for this request. */
    private RetryPolicy mRetryPolicy;

    /**
     * When a request can be retrieved from cache but must be refreshed from the
     * network, the cache entry will be stored here so that in the event of a
     * "Not Modified" response, we can be sure it hasn't been evicted from
     * cache.
     */
    private Cache.Entry mCacheEntry = null;

    /** An opaque token tagging this request; used for bulk cancellation. */
    private Object mTag;