android中网络请求库volley.jar和asnychttp.jar

/* * Copyright (C) 2011 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with 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. */ package com.android.volley; import android.net.TrafficStats; import android.net.Uri; import android.os.Handler; import android.os.Looper; import android.os.SystemClock; import android.text.TextUtils; import com.android.volley.VolleyLog.MarkerLog; import java.io.UnsupportedEncodingException; import java.net.URLEncoder; import java.util.Collections; import java.util.Map; /** * Base class for all network requests. * * @param <T> The type of parsed response this request expects. */ public abstract class Request<T> implements Comparable<Request<T>> { /** * Default encoding for POST or PUT parameters. See {@link #getParamsEncoding()}. */ private static final String DEFAULT_PARAMS_ENCODING = "UTF-8"; /** * Supported request methods. */ public interface Method { int DEPRECATED_GET_OR_POST = -1; int GET = 0; int POST = 1; int PUT = 2; int DELETE = 3; int HEAD = 4; int OPTIONS = 5; int TRACE = 6; int PATCH = 7; } /** An event log tracing the lifetime of this request; for debugging. */ private final MarkerLog mEventLog = MarkerLog.ENABLED ? new MarkerLog() : null; /** * 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; /** The redirect url to use for 3xx http responses */ private String mRedirectUrl; /** 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; /** * Creates a new request with the given URL and error listener. Note that * the normal response listener is not provided here as delivery of responses * is provided by subclasses, who have a better idea of how to deliver an * already-parsed response. * * @deprecated Use {@link #Request(int, String, com.android.volley.Response.ErrorListener)}. */ @Deprecated public Request(String url, Response.ErrorListener listener) { this(Method.DEPRECATED_GET_OR_POST, url, listener); } /** * Creates a new request with the given method (one of the values from {@link Method}), * URL, and error listener. Note that the normal response listener is not provided here as * delivery of responses is provided by subclasses, who have a better idea of how to deliver * an already-parsed response. */ public Request(int method, String url, Response.ErrorListener listener) { mMethod = method; mUrl = url; mErrorListener = listener; setRetryPolicy(new DefaultRetryPolicy()); mDefaultTrafficStatsTag = findDefaultTrafficStatsTag(url); } /** * Return the method for this request. Can be one of the values in {@link Method}. */ public int getMethod() { return mMethod; } /** * Set a tag on this request. Can be used to cancel all requests with this * tag by {@link RequestQueue#cancelAll(Object)}. * * @return This Request object to allow for chaining. */ public Request<?> setTag(Object tag) { mTag = tag; return this; } /** * Returns this request's tag. * @see Request#setTag(Object) */ public Object getTag() { return mTag; } /** * @return this request's {@link com.android.volley.Response.ErrorListener}. */ public Response.ErrorListener getErrorListener() { return mErrorListener; } /** * @return A tag for use with {@link TrafficStats#setThreadStatsTag(int)} */ public int getTrafficStatsTag() { return mDefaultTrafficStatsTag; } /** * @return The hashcode of the URL's host component, or 0 if there is none. */ private static int findDefaultTrafficStatsTag(String url) { if (!TextUtils.isEmpty(url)) { Uri uri = Uri.parse(url); if (uri != null) { String host = uri.getHost(); if (host != null) { return host.hashCode(); } } } return 0; } /** * Sets the retry policy for this request. * * @return This Request object to allow for chaining. */ public Request<?> setRetryPolicy(RetryPolicy retryPolicy) { mRetryPolicy = retryPolicy; return this; } /** * Adds an event to this request's event log; for debugging. */ public void addMarker(String tag) { if (MarkerLog.ENABLED) { mEventLog.add(tag, Thread.currentThread().getId()); } else if (mRequestBirthTime == 0) { mRequestBirthTime = SystemClock.elapsedRealtime(); } } /** * Notifies the request queue that this request has finished (successfully or with error). * * <p>Also dumps all events from this request's event log; for debugging.</p> */ void finish(final String tag) { if (mRequestQueue != null) { mRequestQueue.finish(this); } if (MarkerLog.ENABLED) { final long threadId = Thread.currentThread().getId(); if (Looper.myLooper() != Looper.getMainLooper()) { // If we finish marking off of the main thread, we need to // actually do it on the main thread to ensure correct ordering. Handler mainThread = new Handler(Looper.getMainLooper()); mainThread.post(new Runnable() { @Override public void run() { mEventLog.add(tag, threadId); mEventLog.finish(this.toString()); } }); return; } mEventLog.add(tag, threadId); mEventLog.finish(this.toString()); } else {