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Example 1 with CacheEntity

use of com.lzy.okgo.cache.CacheEntity in project BaseProject by feer921.

the class HeaderParser method createCacheEntity.

/**
 * 根据请求结果生成对应的缓存实体类,以下为缓存相关的响应头
 * Cache-Control: public                             响应被缓存,并且在多用户间共享
 * Cache-Control: private                            响应只能作为私有缓存,不能在用户之间共享
 * Cache-Control: no-cache                           提醒浏览器要从服务器提取文档进行验证
 * Cache-Control: no-store                           绝对禁止缓存(用于机密,敏感文件)
 * Cache-Control: max-age=60                         60秒之后缓存过期(相对时间),优先级比Expires高
 * Date: Mon, 19 Nov 2012 08:39:00 GMT               当前response发送的时间
 * Expires: Mon, 19 Nov 2012 08:40:01 GMT            缓存过期的时间(绝对时间)
 * Last-Modified: Mon, 19 Nov 2012 08:38:01 GMT      服务器端文件的最后修改时间
 * ETag: "20b1add7ec1cd1:0"                          服务器端文件的ETag值
 * 如果同时存在cache-control和Expires,浏览器总是优先使用cache-control
 *
 * @param responseHeaders 返回数据中的响应头
 * @param data            解析出来的数据
 * @param cacheMode       缓存的模式
 * @param cacheKey        缓存的key
 * @return 缓存的实体类
 */
public static <T> CacheEntity<T> createCacheEntity(Headers responseHeaders, T data, CacheMode cacheMode, String cacheKey) {
    // 缓存相对于本地的到期时间
    long localExpire = 0;
    if (cacheMode == CacheMode.DEFAULT) {
        long date = HttpHeaders.getDate(responseHeaders.get(HttpHeaders.HEAD_KEY_DATE));
        long expires = HttpHeaders.getExpiration(responseHeaders.get(HttpHeaders.HEAD_KEY_EXPIRES));
        String cacheControl = HttpHeaders.getCacheControl(responseHeaders.get(HttpHeaders.HEAD_KEY_CACHE_CONTROL), responseHeaders.get(HttpHeaders.HEAD_KEY_PRAGMA));
        // 没有缓存头控制,不需要缓存
        if (TextUtils.isEmpty(cacheControl) && expires <= 0)
            return null;
        long maxAge = 0;
        if (!TextUtils.isEmpty(cacheControl)) {
            StringTokenizer tokens = new StringTokenizer(cacheControl, ",");
            while (tokens.hasMoreTokens()) {
                String token = tokens.nextToken().trim().toLowerCase(Locale.getDefault());
                if (token.equals("no-cache") || token.equals("no-store")) {
                    // 服务器指定不缓存
                    return null;
                } else if (token.startsWith("max-age=")) {
                    try {
                        // 获取最大缓存时间
                        maxAge = Long.parseLong(token.substring(8));
                        // 服务器缓存设置立马过期,不缓存
                        if (maxAge <= 0)
                            return null;
                    } catch (Exception e) {
                        OkLogger.e(e);
                    }
                }
            }
        }
        // 获取基准缓存时间,优先使用response中的date头,如果没有就使用本地时间
        long now = System.currentTimeMillis();
        if (date > 0)
            now = date;
        if (maxAge > 0) {
            // Http1.1 优先验证 Cache-Control 头
            localExpire = now + maxAge * 1000;
        } else if (expires >= 0) {
            // Http1.0 验证 Expires 头
            localExpire = expires;
        }
    } else {
        localExpire = System.currentTimeMillis();
    }
    // 将response中所有的头存入 HttpHeaders,原因是写入数据库的对象需要实现序列化,而ok默认的Header没有序列化
    HttpHeaders headers = new HttpHeaders();
    for (String headerName : responseHeaders.names()) {
        headers.put(headerName, responseHeaders.get(headerName));
    }
    // 构建缓存实体对象
    CacheEntity<T> cacheEntity = new CacheEntity<>();
    cacheEntity.setKey(cacheKey);
    cacheEntity.setData(data);
    cacheEntity.setLocalExpire(localExpire);
    cacheEntity.setResponseHeaders(headers);
    return cacheEntity;
}
Also used : HttpHeaders(com.lzy.okgo.model.HttpHeaders) StringTokenizer(java.util.StringTokenizer) CacheEntity(com.lzy.okgo.cache.CacheEntity)

Example 2 with CacheEntity

use of com.lzy.okgo.cache.CacheEntity in project okhttp-OkGo by jeasonlzy.

the class HeaderParser method createCacheEntity.

/**
 * 根据请求结果生成对应的缓存实体类,以下为缓存相关的响应头
 * Cache-Control: public                             响应被缓存,并且在多用户间共享
 * Cache-Control: private                            响应只能作为私有缓存,不能在用户之间共享
 * Cache-Control: no-cache                           提醒浏览器要从服务器提取文档进行验证
 * Cache-Control: no-store                           绝对禁止缓存(用于机密,敏感文件)
 * Cache-Control: max-age=60                         60秒之后缓存过期(相对时间),优先级比Expires高
 * Date: Mon, 19 Nov 2012 08:39:00 GMT               当前response发送的时间
 * Expires: Mon, 19 Nov 2012 08:40:01 GMT            缓存过期的时间(绝对时间)
 * Last-Modified: Mon, 19 Nov 2012 08:38:01 GMT      服务器端文件的最后修改时间
 * ETag: "20b1add7ec1cd1:0"                          服务器端文件的ETag值
 * 如果同时存在cache-control和Expires,浏览器总是优先使用cache-control
 *
 * @param responseHeaders 返回数据中的响应头
 * @param data            解析出来的数据
 * @param cacheMode       缓存的模式
 * @param cacheKey        缓存的key
 * @return 缓存的实体类
 */
public static <T> CacheEntity<T> createCacheEntity(Headers responseHeaders, T data, CacheMode cacheMode, String cacheKey) {
    // 缓存相对于本地的到期时间
    long localExpire = 0;
    if (cacheMode == CacheMode.DEFAULT) {
        long date = HttpHeaders.getDate(responseHeaders.get(HttpHeaders.HEAD_KEY_DATE));
        long expires = HttpHeaders.getExpiration(responseHeaders.get(HttpHeaders.HEAD_KEY_EXPIRES));
        String cacheControl = HttpHeaders.getCacheControl(responseHeaders.get(HttpHeaders.HEAD_KEY_CACHE_CONTROL), responseHeaders.get(HttpHeaders.HEAD_KEY_PRAGMA));
        // 没有缓存头控制,不需要缓存
        if (TextUtils.isEmpty(cacheControl) && expires <= 0)
            return null;
        long maxAge = 0;
        if (!TextUtils.isEmpty(cacheControl)) {
            StringTokenizer tokens = new StringTokenizer(cacheControl, ",");
            while (tokens.hasMoreTokens()) {
                String token = tokens.nextToken().trim().toLowerCase(Locale.getDefault());
                if (token.equals("no-cache") || token.equals("no-store")) {
                    // 服务器指定不缓存
                    return null;
                } else if (token.startsWith("max-age=")) {
                    try {
                        // 获取最大缓存时间
                        maxAge = Long.parseLong(token.substring(8));
                        // 服务器缓存设置立马过期,不缓存
                        if (maxAge <= 0)
                            return null;
                    } catch (Exception e) {
                        OkLogger.printStackTrace(e);
                    }
                }
            }
        }
        // 获取基准缓存时间,优先使用response中的date头,如果没有就使用本地时间
        long now = System.currentTimeMillis();
        if (date > 0)
            now = date;
        if (maxAge > 0) {
            // Http1.1 优先验证 Cache-Control 头
            localExpire = now + maxAge * 1000;
        } else if (expires >= 0) {
            // Http1.0 验证 Expires 头
            localExpire = expires;
        }
    } else {
        localExpire = System.currentTimeMillis();
    }
    // 将response中所有的头存入 HttpHeaders,原因是写入数据库的对象需要实现序列化,而ok默认的Header没有序列化
    HttpHeaders headers = new HttpHeaders();
    for (String headerName : responseHeaders.names()) {
        headers.put(headerName, responseHeaders.get(headerName));
    }
    // 构建缓存实体对象
    CacheEntity<T> cacheEntity = new CacheEntity<>();
    cacheEntity.setKey(cacheKey);
    cacheEntity.setData(data);
    cacheEntity.setLocalExpire(localExpire);
    cacheEntity.setResponseHeaders(headers);
    return cacheEntity;
}
Also used : HttpHeaders(com.lzy.okgo.model.HttpHeaders) StringTokenizer(java.util.StringTokenizer) CacheEntity(com.lzy.okgo.cache.CacheEntity)

Aggregations

CacheEntity (com.lzy.okgo.cache.CacheEntity)2 HttpHeaders (com.lzy.okgo.model.HttpHeaders)2 StringTokenizer (java.util.StringTokenizer)2