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  package com.fasterxml.clustermate.api;

Constants for ClusterMate and systems built on it.
  
  public interface ClusterMateConstants
  {
      /*
      /**********************************************************************
     /* Standard HTTP Headers
     /**********************************************************************
      */

    
Standard HTTP header indicating type of content (payload) of the response/request.
 
     public final static String HTTP_HEADER_CONTENT_TYPE = "Content-Type";
    
    
Standard HTTP header indicating compression that Entity (payload) uses, if any.
 
     public final static String HTTP_HEADER_COMPRESSION = "Content-Encoding";

    
Standard HTTP header indicating content type(s) caller accepts
 
     public final static String HTTP_HEADER_ACCEPT = "Accept";
    
    
Standard HTTP header indicating compression methods client accepts, if any.
 
     public final static String HTTP_HEADER_ACCEPT_COMPRESSION = "Accept-Encoding";

    
Standard HTTP header that indicates length of entity in bytes, if length is known; missing or -1 if not known.
 
     public final static String HTTP_HEADER_CONTENT_LENGTH = "Content-Length";
     
     public final static String HTTP_HEADER_RANGE_FOR_REQUEST = "Range";
     
     public final static String HTTP_HEADER_RANGE_FOR_RESPONSE = "Content-Range";
 
     // // Support for Etag-based caching
     
     public final static String HTTP_HEADER_ETAG = "Etag";
 
     public final static String HTTP_HEADER_ETAG_NO_MATCH = "If-None-Match";
     
     /*
     /**********************************************************************
     /* Custom HTTP Headers
     /**********************************************************************
      */
    
    
Name of custom HTTP header we use to indicate the latest available cluster state update from given server node.

Whether to use "X-" prefix or not seems in dispute; can change if need be.

 
     public final static String CUSTOM_HTTP_HEADER_LAST_CLUSTER_UPDATE = "X-TempStore-ClusterUpdate";

    
In case of PUT that does not provide checksum as argument, server may return checksum upon successful call. This can be used for further calls by client.
 
     public final static String CUSTOM_HTTP_HEADER_CHECKSUM = "X-TempStore-Checksum";
 
     /*
     /**********************************************************************
     /* Query parameters, ClusterMate-specific
     /**********************************************************************
      */
 
     public final static String QUERY_PARAM_CHECKSUM = "checksum";
 
     public final static String QUERY_PARAM_MIN_SINCE_ACCESS_TTL = "minSinceAccessTTL";
     public final static String QUERY_PARAM_MAX_TTL = "maxTTL";
    
    
Query parameter used for defining timestamp after which (inclusive) entries are to be returned, as determine by their insertion time.
 
     public final static String QUERY_PARAM_SINCE = "since";
     
     public final static String QUERY_PARAM_KEYRANGE_START = "keyRangeStart";
 
     public final static String QUERY_PARAM_KEYRANGE_LENGTH = "keyRangeLength";

    
Query parameter used to pass information about calling node.
 
     public final static String QUERY_PARAM_CALLER = "caller";

    
Query parameter that indicates state of the caller
    public final static String QUERY_PARAM_STATE = "state";
    
    
Query parameter used to contain hash code for last received cluster view.
    public final static String QUERY_PARAM_CLUSTER_HASH = "clusterHash";

    
Query parameter that contains timestamp defined by sender and indicates timestamp relevant to the message (such as status update).
    public final static String QUERY_PARAM_TIMESTAMP = "timestamp";

    
Query parameter that defines type of items/entries to list.
    public final static String QUERY_PARAM_TYPE = "type";

    
Query parameter that defines maximum number of entries caller wishes to list.
    public final static String QUERY_PARAM_MAX_ENTRIES = "maxEntries";

    
Query parameter that defines what was the last traversed item, if any, when listing entries.
    public final static String QUERY_PARAM_LAST_SEEN = "lastSeen";

    
Number of retries for this particular request; used mostly with entry points that re-route, and typically do round-robin dispatch using this value
    public final static String QUERY_PARAM_RETRY_COUNT = "retry";
    /*
    /**********************************************************************
    /* Standard HTTP Response codes
    /**********************************************************************
     */
    public final static int HTTP_STATUS_OK = 200;
    public final static int HTTP_STATUS_OK_PARTIAL = 206;
    public final static int HTTP_STATUS_NOT_FOUND = 404;
    /*
    /**********************************************************************
    /* Custom 'virtual' HTTP response codes; used to indicate client-side
    /* failures that do not have real server-provided failing status code
    /**********************************************************************
     */
    
    
Constant used as a placeholder for internal call failure caused by an exception thrown on client side.
    public final static int HTTP_STATUS_CUSTOM_FAIL_CLIENT_THROWABLE = -2;

    
Constant used as a placeholder for internal call failure caused by a problem on client side (before trying to call server), as identified by given message
    public final static int HTTP_STATUS_CUSTOM_FAIL_CLIENT_MESSAGE = -3;
    /* Response code used when the request timed out; as per docs, while
     * not a formally standardized code, is actually used. And is considered
     * retriable (as 5xx code) which is why we choose it.
     */
    public final static int HTTP_STATUS_CLIENT_TIMEOUT_ON_READ = 598;    
    /*
    /**********************************************************************
    /* Other constants
    /**********************************************************************
     */
    public final static String STATE_ACTIVE = "active";
    public final static String STATE_INACTIVE = "inactive";
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