/usr/lib/swipl/library/paxos.pl
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  • swipl
    • library
      • settings.pl -- Setting management
      • error.pl -- Error generating support
      • broadcast.pl -- Event service
      • debug.pl -- Print debug messages and test assertions
      • lists.pl -- List Manipulation
      • pairs.pl -- Operations on key-value lists
      • option.pl -- Option list processing
      • arithmetic.pl -- Extensible arithmetic
      • pldoc.pl -- Process source documentation
      • apply.pl -- Apply predicates on a list
      • operators.pl -- Manage operators
      • prolog_source.pl -- Examine Prolog source-files
      • pengines.pl -- Pengines: Web Logic Programming Made Easy
      • time.pl -- Time and alarm library
      • shlib.pl -- Utility library for loading foreign objects (DLLs, shared objects)
      • zip.pl -- Access resource ZIP archives
      • uri.pl -- Process URIs
      • socket.pl -- Network socket (TCP and UDP) library
      • thread_pool.pl -- Resource bounded thread management
      • rbtrees.pl -- Red black trees
      • gensym.pl -- Generate unique symbols
      • readutil.pl -- Read utilities
      • url.pl -- Analysing and constructing URL
      • utf8.pl -- UTF-8 encoding/decoding on lists of character codes.
      • memfile.pl
      • sgml.pl -- SGML, XML and HTML parser
      • iostream.pl -- Utilities to deal with streams
      • dialect.pl -- Support multiple Prolog dialects
      • quasi_quotations.pl -- Define Quasi Quotation syntax
      • pure_input.pl -- Pure Input from files and streams
      • base64.pl -- Base64 encoding and decoding
      • aggregate.pl -- Aggregation operators on backtrackable predicates
      • ordsets.pl -- Ordered set manipulation
      • oset.pl -- Ordered set manipulation
      • record.pl -- Access compound arguments by name
      • filesex.pl -- Extended operations on files
      • charsio.pl -- I/O on Lists of Character Codes
      • sandbox.pl -- Sandboxed Prolog code
      • assoc.pl -- Binary associations
      • prolog_format.pl -- Analyse format specifications
      • when.pl -- Conditional coroutining
      • modules.pl -- Module utility predicates
      • term_to_json.pl
      • uuid.pl -- Universally Unique Identifier (UUID) Library
      • ssl.pl -- Secure Socket Layer (SSL) library
      • crypto.pl -- Cryptography and authentication library
      • solution_sequences.pl -- Modify solution sequences
      • nb_set.pl -- Non-backtrackable sets
      • terms.pl -- Term manipulation
      • apply_macros.pl -- Goal expansion rules to avoid meta-calling
      • sha.pl -- SHA secure hashes
      • random.pl -- Random numbers
      • pcre.pl -- Perl compatible regular expression matching for SWI-Prolog
      • pengines_io.pl -- Provide Prolog I/O for HTML clients
      • listing.pl -- List programs and pretty print clauses
      • ansi_term.pl -- Print decorated text to ANSI consoles
      • prolog_clause.pl -- Get detailed source-information about a clause
      • occurs.pl -- Finding and counting sub-terms
      • yall.pl -- Lambda expressions
      • prolog_stream.pl -- A stream with Prolog callbacks
      • process.pl -- Create processes and redirect I/O
      • zlib.pl -- Zlib wrapper for SWI-Prolog
      • bdb.pl -- Berkeley DB interface
      • hash_stream.pl -- Maintain a hash on a stream
      • md5.pl -- MD5 hashes
      • porter_stem.pl
      • csv.pl -- Process CSV (Comma-Separated Values) data
      • pprint.pl -- Pretty Print Prolog terms
      • atom.pl -- Operations on atoms
      • ctypes.pl -- Character code classification
      • prolog_xref.pl -- Prolog cross-referencer data collection
      • prolog_colour.pl -- Prolog syntax colouring support.
      • predicate_options.pl -- Access and analyse predicate options
      • lazy_lists.pl -- Lazy list handling
      • ugraphs.pl -- Graph manipulation library
      • xpath.pl -- Select nodes in an XML DOM
      • doc_http.pl -- Documentation server
      • www_browser.pl -- Open a URL in the users browser
      • prolog_pack.pl -- A package manager for Prolog
      • git.pl -- Run GIT commands
      • crypt.pl
      • persistency.pl -- Provide persistent dynamic predicates
      • edinburgh.pl -- Some traditional Edinburgh predicates
      • prolog_breakpoints.pl -- Manage Prolog break-points
      • unix.pl -- Unix specific operations
      • mallocinfo.pl -- Memory allocation details
      • chr.pl
      • dicts.pl -- Dict utilities
      • dif.pl -- The dif/2 constraint
      • varnumbers.pl -- Utilities for numbered terms
      • shell.pl -- Elementary shell commands
      • uid.pl -- User and group management on Unix systems
      • syslog.pl -- Unix syslog interface
      • main.pl -- Provide entry point for scripts
      • base32.pl -- Base32 encoding and decoding
      • backcomp.pl -- Backward compatibility
      • system.pl -- System utilities
      • codesio.pl -- I/O on Lists of Character Codes
      • coinduction.pl -- Co-Logic Programming
      • date.pl -- Process dates and times
      • heaps.pl -- heaps/priority queues
      • sort.pl
      • statistics.pl -- Get information about resource usage
      • double_metaphone.pl -- Phonetic string matching
      • paxos.pl -- A Replicated Data Store
        • paxos_initialize/1
        • paxos_set/1
        • paxos_set/2
        • paxos_set/3
        • paxos_get/1
        • paxos_get/2
        • paxos_get/3
        • paxos_replicate_key/3
        • paxos_on_change/2
        • paxos_on_change/3
      • rdf_triple.pl -- Create triples from intermediate representation
      • rdf_parser.pl
      • rewrite.pl
      • quintus.pl -- Quintus compatibility
      • rdf.pl
      • qsave.pl -- Save current program as a state or executable
      • editline.pl -- BSD libedit based command line editing
      • console_input.pl
      • prolog_config.pl -- Provide configuration information
      • readline.pl -- GNU readline interface
      • prolog_history.pl -- Per-directory persistent commandline history
      • streampool.pl -- Input multiplexing
      • prolog_codewalk.pl -- Prolog code walker
      • check.pl -- Consistency checking
      • prolog_autoload.pl -- Autoload all dependencies
      • prolog_metainference.pl -- Infer meta-predicate properties
      • isub.pl -- isub: a string similarity measure
      • cgi.pl -- Read CGI parameters
      • edit.pl -- Editor interface
      • make.pl -- Reload modified source files
      • rdf_write.pl -- Write RDF/XML from a list of triples
      • sgml_write.pl -- XML/SGML writer module
      • xsdp_types.pl -- XML-Schema primitive types
      • thread.pl -- High level thread primitives
      • udp_broadcast.pl -- A UDP broadcast proxy
      • pwp.pl -- Prolog Well-formed Pages
      • plunit.pl -- Unit Testing
      • prolog_stack.pl -- Examine the Prolog stack
      • unicode.pl -- Unicode string handling
      • archive.pl -- Access several archive formats
      • c14n2.pl -- C14n2 canonical XML documents
      • threadutil.pl -- Interactive thread utilities
      • xmlenc.pl -- XML encryption library
      • odbc.pl
      • help.pl -- Text based manual
      • doc_latex.pl -- PlDoc LaTeX backend
      • files.pl
      • xmldsig.pl -- XML Digital signature
      • table.pl
      • snowball.pl -- The Snowball multi-lingual stemmer library
      • writef.pl -- Old-style formatted write
      • protobufs.pl -- Google's Protocol Buffers
      • optparse.pl -- command line parsing
      • doc_files.pl -- Create stand-alone documentation files
 paxos_set(+Key, +Value) is semidet
 paxos_set(+Key, +Value, +Options) is semidet
negotiates to have Key-Value recorded in the ledger for each of the quorum's members. This predicate succeeds if the quorum unanimously accepts the proposed term. If no such entry exists in the Paxon's ledger, then one is silently created. paxos_set/1 will retry the transaction several times (default: 20) before failing. Failure is rare and is usually the result of a collision of two or more writers writing to the same term at precisely the same time. On failure, it may be useful to wait some random period of time, and then retry the transaction. By specifying a retry count of zero, paxos_set/2 will succeed iff the first ballot succeeds.

On success, paxos_set/1 will also broadcast the term paxos(changed(Key,Value), to the quorum.

Options processed:

retry(Retries)
is a non-negative integer specifying the number of retries that will be performed before a set is abandoned. Defaults to the setting max_sets (20).
timeout(+Seconds)
Max time to wait for the forum to reply. Defaults to the setting response_timeout (0.020, 20ms).
Arguments:
Term- is a compound that may have unbound variables.
To be done
- If the Value is already current, should we simply do nothing?