Example usage for org.apache.http.client.cache HttpCacheUpdateException HttpCacheUpdateException

Introduction

In this page you can find the example usage for org.apache.http.client.cache HttpCacheUpdateException HttpCacheUpdateException.

Prototype

public HttpCacheUpdateException(String message) 

Source Link

Usage

From source file:org.apache.http.impl.client.cache.memcached.MemcachedHttpCacheStorage.java

public void updateEntry(final String url, final HttpCacheUpdateCallback callback)
        throws HttpCacheUpdateException, IOException {
    int numRetries = 0;
    final String key = getCacheKey(url);
    if (key == null) {
        throw new HttpCacheUpdateException("couldn't generate cache key");
    }/*ww w . j  a v  a2 s .c om*/
    do {
        try {
            final CASValue<Object> v = client.gets(key);
            MemcachedCacheEntry mce = (v == null) ? null : reconstituteEntry(v.getValue());
            if (mce != null && (!url.equals(mce.getStorageKey()))) {
                mce = null;
            }
            final HttpCacheEntry existingEntry = (mce == null) ? null : mce.getHttpCacheEntry();
            final HttpCacheEntry updatedEntry = callback.update(existingEntry);

            if (existingEntry == null) {
                putEntry(url, updatedEntry);
                return;

            } else {
                final byte[] updatedBytes = serializeEntry(url, updatedEntry);
                final CASResponse casResult = client.cas(key, v.getCas(), updatedBytes);
                if (casResult != CASResponse.OK) {
                    numRetries++;
                } else {
                    return;
                }
            }
        } catch (final OperationTimeoutException ex) {
            throw new MemcachedOperationTimeoutException(ex);
        }
    } while (numRetries <= maxUpdateRetries);

    throw new HttpCacheUpdateException("Failed to update");
}

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