* Keys need to be unique only within a given context, so multiple
* components can share a single storage service safely as long as they
* use different labels.
+ *
+ * <p>The allowable sizes for contexts, keys, and short values can vary
+ * and be reported by the implementation to callers, but MUST be at least
+ * 255 bytes.
*/
class XMLTOOL_API StorageService
{
MAKE_NONCOPYABLE(StorageService);
public:
virtual ~StorageService();
+
+ class XMLTOOL_API Capabilities {
+ MAKE_NONCOPYABLE(Capabilities);
+ unsigned int m_contextSize, m_keySize, m_stringSize;
+ public:
+ /**
+ * Constructor.
+ *
+ * @param contextSize max size of context labels in characters
+ * @param keysize max size of keys in characters
+ * @param stringSize max size of string values in characters
+ */
+ Capabilities(unsigned int contextSize, unsigned int keySize, unsigned int stringSize);
+ ~Capabilities();
+
+ /**
+ * Returns max size of context labels in characters
+ * @return max size of context labels in characters
+ */
+ unsigned int getContextSize() const;
+
+ /**
+ * Returns max size of keys in characters
+ * @return max size of keys in characters
+ */
+ unsigned int getKeySize() const;
+
+ /**
+ * Returns max size of string values in characters
+ * @return max size of string values in characters
+ */
+ unsigned int getStringSize() const;
+ };
/**
+ * Returns the capabilities of the underlying service.
+ * <p>If implementations support only the 255 character minimum, the default
+ * implementation of this method will suffice.
+ *
+ * @return a reference to an interface to access the service's capabilities
+ */
+ virtual const Capabilities& getCapabilities() const;
+
+ /**
* Creates a new "short" record in the storage service.
*
- * @param context a storage context label of up to 255 bytes
- * @param key null-terminated unique key of up to 255 bytes
- * @param value null-terminated value of up to 255 bytes to store
+ * @param context a storage context label
+ * @param key null-terminated unique key
+ * @param value null-terminated value
* @param expiration an expiration timestamp, after which the record can be purged
* @return true iff record was inserted, false iff a duplicate was found
*
*
* <p>The version parameter can be set for "If-Modified-Since" semantics.
*
- * @param context a storage context label of up to 255 bytes
- * @param key null-terminated unique key of up to 255 bytes
+ * @param context a storage context label
+ * @param key null-terminated unique key
* @param pvalue location in which to return the record value
* @param pexpiration location in which to return the expiration timestamp
* @param version if > 0, only copy back data if newer than supplied version
/**
* Updates an existing "short" record in the storage service.
*
- * @param context a storage context label of up to 255 bytes
- * @param key null-terminated unique key of up to 255 bytes
- * @param value null-terminated value of up to 255 bytes to store, or nullptr to leave alone
+ * @param context a storage context label
+ * @param key null-terminated unique key
+ * @param value null-terminated value to store, or nullptr to leave alone
* @param expiration a new expiration timestamp, or 0 to leave alone
* @param version if > 0, only update if the current version matches this value
* @return the version of the record after update, 0 if no record exists, or -1 if the version
/**
* Deletes an existing "short" record from the storage service.
*
- * @param context a storage context label of up to 255 bytes
- * @param key null-terminated unique key of up to 255 bytes
+ * @param context a storage context label
+ * @param key null-terminated unique key
* @return true iff the record existed and was deleted
*
* @throws IOException raised if errors occur in the deletion process
/**
* Creates a new "long" record in the storage service.
*
- * @param context a storage context label of up to 255 bytes
- * @param key null-terminated unique key of up to 255 bytes
+ * @param context a storage context label
+ * @param key null-terminated unique key
* @param value null-terminated value of arbitrary length
* @param expiration an expiration timestamp, after which the record can be purged
* @return true iff record was inserted, false iff a duplicate was found
*
* <p>The version parameter can be set for "If-Modified-Since" semantics.
*
- * @param context a storage context label of up to 255 bytes
- * @param key null-terminated unique key of up to 255 bytes
+ * @param context a storage context label
+ * @param key null-terminated unique key
* @param pvalue location in which to return the record value
* @param pexpiration location in which to return the expiration timestamp
* @param version if > 0, only copy back data if newer than supplied version
/**
* Updates an existing "long" record in the storage service.
*
- * @param context a storage context label of up to 255 bytes
- * @param key null-terminated unique key of up to 255 bytes
+ * @param context a storage context label
+ * @param key null-terminated unique key
* @param value null-terminated value of arbitrary length to store, or nullptr to leave alone
* @param expiration a new expiration timestamp, or 0 to leave alone
* @param version if > 0, only update if the current version matches this value
/**
* Deletes an existing "long" record from the storage service.
*
- * @param context a storage context label of up to 255 bytes
- * @param key null-terminated unique key of up to 255 bytes
+ * @param context a storage context label
+ * @param key null-terminated unique key
* @return true iff the record existed and was deleted
*
* @throws IOException raised if errors occur in the deletion process
projects / shibboleth / cpp-xmltooling.git / blobdiff