com.baidu.asynchttpclient.AsyncHttpRequest.java Source code

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Here is the source code for com.baidu.asynchttpclient.AsyncHttpRequest.java

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/*
 *Android Asynchronous Http Client
 * Copyright (c) 2011 James Smith <james@loopj.com>
 * http://loopj.com
 * 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.baidu.asynchttpclient;

import org.apache.http.HttpResponse;
import org.apache.http.client.HttpRequestRetryHandler;
import org.apache.http.client.methods.HttpUriRequest;
import org.apache.http.impl.client.AbstractHttpClient;
import org.apache.http.protocol.HttpContext;

import java.io.IOException;
import java.net.ConnectException;

class AsyncHttpRequest implements Runnable {
    private final AbstractHttpClient client;
    private final HttpContext context;
    private final HttpUriRequest request;
    private final AsyncHttpResponseHandler responseHandler;
    private int executionCount;

    public AsyncHttpRequest(AbstractHttpClient client, HttpContext context, HttpUriRequest request,
            AsyncHttpResponseHandler responseHandler) {
        this.client = client;
        this.context = context;
        this.request = request;
        this.responseHandler = responseHandler;
    }

    public void run() {
        try {
            if (responseHandler != null) {
                responseHandler.sendStartMessage();
            }

            makeRequestWithRetries();
        } catch (IOException e) {
            if (responseHandler != null) {
                // TODO: by Guangshan Shang
                responseHandler.sendFailureMessage(e, e.toString());
            }
        }

        if (responseHandler != null) {
            responseHandler.sendFinishMessage();
        }
    }

    private void makeRequest() throws IOException {
        if (!Thread.currentThread().isInterrupted()) {
            updateNetProxy();
            HttpResponse response = client.execute(request, context);
            if (!Thread.currentThread().isInterrupted()) {
                if (responseHandler != null) {
                    responseHandler.sendResponseMessage(response);
                }
            }
            // else {
            // responseHandler.sendFailureMessage(new InterruptedException("request interupted!"), null);
            // TODO: should raise InterruptedException? this block is reached whenever the request is cancelled
            // before its response is received
            // }
        } else {
            responseHandler.sendFailureMessage(new InterruptedException("request interupted!"), null);
        }
    }

    /**
     * shangguangshan ?
     */
    private void updateNetProxy() {
        NetworkUtils.refreshProxySetting(null, client);
    }

    private void makeRequestWithRetries() throws ConnectException {
        // This is an additional layer of retry logic lifted from droid-fu
        // See:
        // https://github.com/kaeppler/droid-fu/blob/master/src/main/java/com/github/droidfu/http/BetterHttpRequestBase.java
        boolean retry = true;
        IOException cause = null;
        HttpRequestRetryHandler retryHandler = client.getHttpRequestRetryHandler();
        while (retry) {
            try {
                makeRequest();
                return;
            } catch (IOException e) {
                cause = e;
                retry = retryHandler.retryRequest(cause, ++executionCount, context);
            } catch (NullPointerException e) {
                // there's a bug in HttpClient 4.0.x that on some occasions causes
                // DefaultRequestExecutor to throw an NPE, see
                // http://code.google.com/p/android/issues/detail?id=5255
                cause = new IOException("NPE in HttpClient" + e.getMessage());
                retry = retryHandler.retryRequest(cause, ++executionCount, context);
            }
        }

        // no retries left, crap out with exception
        ConnectException ex = new ConnectException();
        ex.initCause(cause);
        throw ex;
    }
}