com.mygame.cloudcontact.http.HttpHandler.java Source code

Java tutorial

Introduction

Here is the source code for com.mygame.cloudcontact.http.HttpHandler.java

Source

/**
 * Copyright (c) 2012-2013, Michael Yang ?? (www.yangfuhai.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.mygame.cloudcontact.http;

import java.io.File;
import java.io.IOException;
import java.net.UnknownHostException;

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

import android.os.AsyncTask;
import android.os.SystemClock;

import com.mygame.cloudcontact.http.entityhandler.EntityCallBack;
import com.mygame.cloudcontact.http.entityhandler.FileEntityHandler;
import com.mygame.cloudcontact.http.entityhandler.StringEntityHandler;

public class HttpHandler<T> extends AsyncTask<Object, Object, Object> implements EntityCallBack {

    private final AbstractHttpClient client;
    private final HttpContext context;

    private final StringEntityHandler mStrEntityHandler = new StringEntityHandler();
    private final FileEntityHandler mFileEntityHandler = new FileEntityHandler();

    private final AjaxCallBack<T> callback;

    private int executionCount = 0;
    private String targetUrl = null; // 
    private boolean isResume = false; // ?
    private String charset;

    // ??
    private CheckResponseInterface mCheckResponse;

    public void setCheckResponse(CheckResponseInterface checkResponse) {
        this.mCheckResponse = checkResponse;
    }

    public HttpHandler(AbstractHttpClient client, HttpContext context, AjaxCallBack<T> callback, String charset) {
        this.client = client;
        this.context = context;
        this.callback = callback;
        this.charset = charset;
    }

    private void makeRequestWithRetries(HttpUriRequest request) throws IOException {
        if (isResume && targetUrl != null) {
            File downloadFile = new File(targetUrl);
            long fileLen = 0;
            if (downloadFile.isFile() && downloadFile.exists()) {
                fileLen = downloadFile.length();
            }
            if (fileLen > 0)
                request.setHeader("RANGE", "bytes=" + fileLen + "-");
        }

        boolean retry = true;
        IOException cause = null;
        HttpRequestRetryHandler retryHandler = client.getHttpRequestRetryHandler();
        while (retry) {
            try {
                if (!isCancelled()) {
                    HttpResponse response = client.execute(request, context);
                    if (!isCancelled()) {
                        handleResponse(request, response);
                    }
                }
                return;
            } catch (UnknownHostException e) {
                publishProgress(UPDATE_FAILURE, e, 0, "unknownHostExceptioncan't resolve host");
                return;
            } catch (IOException e) {
                cause = e;
                retry = retryHandler.retryRequest(cause, ++executionCount, context);
            } catch (NullPointerException e) {
                // HttpClient 4.0.x ?bug
                // http://code.google.com/p/android/issues/detail?id=5255
                cause = new IOException("NPE in HttpClient" + e.getMessage());
                retry = retryHandler.retryRequest(cause, ++executionCount, context);
            } catch (Exception e) {
                cause = new IOException("Exception" + e.getMessage());
                retry = retryHandler.retryRequest(cause, ++executionCount, context);
            }
        }
        if (cause != null)
            throw cause;
        else
            throw new IOException("");
    }

    @Override
    protected Object doInBackground(Object... params) {
        if (params != null && params.length == 3) {
            targetUrl = String.valueOf(params[1]);
            isResume = (Boolean) params[2];
        }
        try {
            publishProgress(UPDATE_START); // 
            makeRequestWithRetries((HttpUriRequest) params[0]);

        } catch (IOException e) {
            publishProgress(UPDATE_FAILURE, e, 0, e.getMessage()); // ?
        }

        return null;
    }

    private final static int UPDATE_START = 1;
    private final static int UPDATE_LOADING = 2;
    private final static int UPDATE_FAILURE = 3;
    private final static int UPDATE_SUCCESS = 4;

    @SuppressWarnings("unchecked")
    @Override
    protected void onProgressUpdate(Object... values) {
        int update = Integer.valueOf(String.valueOf(values[0]));
        switch (update) {
        case UPDATE_START:
            if (callback != null)
                callback.onStart();
            break;
        case UPDATE_LOADING:
            if (callback != null)
                callback.onLoading(Long.valueOf(String.valueOf(values[1])),
                        Long.valueOf(String.valueOf(values[2])));
            break;
        case UPDATE_FAILURE:
            if (callback != null) {
                Throwable error = (Throwable) values[1];
                int errorNo = (Integer) values[2];
                String errorMsg = (String) values[3];
                //
                if (error instanceof IOException) {
                    errorMsg = "";
                } else if (error instanceof HttpResponseException) {
                    errorMsg = "???";
                }

                callback.onFailure(error, errorNo, errorMsg);
            }
            break;
        case UPDATE_SUCCESS:
            if (callback != null) {
                callback.onSuccess((T) values[1]);
                callback.onSuccess((T) values[1], (HttpUriRequest) values[2], (HttpResponse) values[3]);
            }
            break;
        default:
            break;
        }
        super.onProgressUpdate(values);
    }

    public boolean isStop() {
        return mFileEntityHandler.isStop();
    }

    /**
     * @param stop
     *            ?
     */
    public void stop() {
        mFileEntityHandler.setStop(true);
    }

    private void handleResponse(HttpUriRequest request, HttpResponse response) {
        StatusLine status = response.getStatusLine();
        if (status.getStatusCode() >= 300) {
            String errorMsg = "response status error code:" + status.getStatusCode();
            if (status.getStatusCode() == 416 && isResume) {
                errorMsg += " \n maybe you have download complete.";
            }
            publishProgress(UPDATE_FAILURE,
                    new HttpResponseException(status.getStatusCode(), status.getReasonPhrase()),
                    status.getStatusCode(), errorMsg);
        } else {
            try {

                //  ??
                if (mCheckResponse != null) {
                    //
                    if (mCheckResponse.checkResponse(request, response))
                        return;
                }

                // ?
                HttpEntity entity = response.getEntity();
                Object responseBody = null;
                if (entity != null) {
                    time = SystemClock.uptimeMillis();
                    if (targetUrl != null) {
                        responseBody = mFileEntityHandler.handleEntity(entity, this, targetUrl, isResume);
                    } else {
                        responseBody = mStrEntityHandler.handleEntity(entity, this, charset);
                    }
                }
                publishProgress(UPDATE_SUCCESS, responseBody, request, response);
            } catch (IOException e) {
                publishProgress(UPDATE_FAILURE, e, 0, e.getMessage());
            } catch (SeverRequestException e) {
                publishProgress(UPDATE_FAILURE, e, 0, e.getMessage());
            }

        }
    }

    private long time;

    @Override
    public void callBack(long count, long current, boolean mustNoticeUI) {
        if (callback != null && callback.isProgress()) {
            if (mustNoticeUI) {
                publishProgress(UPDATE_LOADING, count, current);
            } else {
                long thisTime = SystemClock.uptimeMillis();
                if (thisTime - time >= callback.getRate()) {
                    time = thisTime;
                    publishProgress(UPDATE_LOADING, count, current);
                }
            }
        }
    }

}