Examples of io.undertow.server.handlers.cache.ResponseCache$DereferenceCallback

Package io.undertow.server.handlers.cache

Examples of io.undertow.server.handlers.cache.ResponseCache$DereferenceCallback

io.undertow.server.handlers.cache.ResponseCache
Facade for an underlying buffer cache that contains response information.
This facade is attached to the exchange and provides a mechanism for handlers to serve cached content. By default a request to serve cached content is interpreted to mean that the resulting response is cacheable, and so by default this will result in the current response being cached (as long as it meets the criteria for caching).
Calling tryServeResponse can also result in the exchange being ended with a not modified response code, if the response headers indicate that this is justified (e.g. if the If-Modified-Since or If-None-Match headers indicate that the client has a cached copy of the response)
This should be installed early in the handler chain, before any content encoding handlers. This allows it to cache compressed copies of the response, which can significantly reduce CPU load.
NOTE: This cache has no concept of authentication, it assumes that if the underlying handler indicates that a response is cachable, then the current user has been properly authenticated to access that resource, and that the resource will not change per user. @author Stuart Douglas

            exchange.setResponseCode(403);
            exchange.endExchange();
            return;
        }


        ResponseCache cache = exchange.getAttachment(ResponseCache.ATTACHMENT_KEY);
        final boolean cachable = this.cachable.resolve(exchange);


        //we set caching headers before we try and serve from the cache
        if (cachable && cacheTime != null) {
            exchange.getResponseHeaders().put(Headers.CACHE_CONTROL, "public, max-age=" + cacheTime);
            if (System.currentTimeMillis() > lastExpiryDate) {
                long date = System.currentTimeMillis();
                lastExpiryHeader = DateUtils.toDateString(new Date(date));
                lastExpiryDate = date;
            }
            exchange.getResponseHeaders().put(Headers.EXPIRES, lastExpiryHeader);
        }


        if (cache != null && cachable) {
            if (cache.tryServeResponse()) {
                return;
            }
        }

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            exchange.setResponseCode(403);
            exchange.endExchange();
            return;
        }


        ResponseCache cache = exchange.getAttachment(ResponseCache.ATTACHMENT_KEY);
        final boolean cachable = this.cachable.resolve(exchange);


        //we set caching headers before we try and serve from the cache
        if (cachable && cacheTime != null) {
            exchange.getResponseHeaders().put(Headers.CACHE_CONTROL, "public, max-age=" + cacheTime);
            if (System.currentTimeMillis() > lastExpiryDate) {
                long date = System.currentTimeMillis();
                lastExpiryHeader = DateUtils.toDateString(new Date(date));
                lastExpiryDate = date;
            }
            exchange.getResponseHeaders().put(Headers.EXPIRES, lastExpiryHeader);
        }


        if (cache != null && cachable) {
            if (cache.tryServeResponse()) {
                return;
            }
        }

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            exchange.setResponseCode(403);
            exchange.endExchange();
            return;
        }


        ResponseCache cache = exchange.getAttachment(ResponseCache.ATTACHMENT_KEY);
        final boolean cachable = this.cachable.resolve(exchange);


        //we set caching headers before we try and serve from the cache
        if (cachable && cacheTime != null) {
            exchange.getResponseHeaders().put(Headers.CACHE_CONTROL, "public, max-age=" + cacheTime);
            if (System.currentTimeMillis() > lastExpiryDate) {
                long date = System.currentTimeMillis();
                lastExpiryHeader = DateUtils.toDateString(new Date(date));
                lastExpiryDate = date;
            }
            exchange.getResponseHeaders().put(Headers.EXPIRES, lastExpiryHeader);
        }


        if (cache != null && cachable) {
            if (cache.tryServeResponse()) {
                return;
            }
        }

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