/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
      • backcomp.pl -- Backward compatibility
      • system.pl -- System utilities
      • doc_files.pl -- Create stand-alone documentation files
      • writef.pl -- Old-style formatted write
      • unicode.pl -- Unicode string handling
      • statistics.pl -- Get information about resource usage
      • snowball.pl -- The Snowball multi-lingual stemmer library
      • table.pl
      • sgml_write.pl -- XML/SGML writer module
      • rdf_write.pl -- Write RDF/XML from a list of triples
      • prolog_autoload.pl -- Autoload all dependencies
      • prolog_codewalk.pl -- Prolog code walker
      • prolog_metainference.pl -- Infer meta-predicate properties
      • check.pl -- Consistency checking
      • protobufs.pl -- Google's Protocol Buffers
      • rdf_triple.pl -- Create triples from intermediate representation
      • rdf_parser.pl
      • rewrite.pl
      • quintus.pl -- Quintus compatibility
      • help.pl -- Text based manual
      • isub.pl -- isub: a string similarity measure
      • coinduction.pl -- Co-Logic Programming
      • 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
      • qsave.pl -- Save current program as a state or executable
      • base32.pl -- Base32 encoding and decoding
      • codesio.pl -- I/O on Lists of Character Codes
      • date.pl -- Process dates and times
      • heaps.pl -- heaps/priority queues
      • sort.pl
      • udp_broadcast.pl -- A UDP broadcast proxy
      • odbc.pl
      • threadutil.pl -- Interactive thread utilities
      • prolog_history.pl -- Per-directory persistent commandline history
      • prolog_config.pl -- Provide configuration information
      • readline.pl -- GNU readline interface
      • optparse.pl -- command line parsing
      • doc_latex.pl -- PlDoc LaTeX backend
      • plunit.pl -- Unit Testing
      • streampool.pl -- Input multiplexing
      • files.pl
      • thread.pl -- High level thread primitives
      • editline.pl -- BSD libedit based command line editing
      • console_input.pl
      • rdf.pl
      • rlimit.pl
      • xsdp_types.pl -- XML-Schema primitive types
      • prolog_stack.pl -- Examine the Prolog stack
      • explain.pl -- Describe Prolog Terms
      • c14n2.pl -- C14n2 canonical XML documents
      • edit.pl -- Editor interface
      • make.pl -- Reload modified source files
      • pwp.pl -- Prolog Well-formed Pages
      • archive.pl -- Access several archive formats
      • test_cover.pl -- Clause cover analysis
      • double_metaphone.pl -- Phonetic string matching
      • xmlenc.pl -- XML encryption library
      • xmldsig.pl -- XML Digital signature
      • cgi.pl -- Read CGI parameters
 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?