Medea Vasp Download

A persistent key-value storage library.

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• Can be embedded in Node.js applications.
• Support for get, put, and remove operations.
• Influenced by Basho's Bitcask key-value store.
• Values can be any string or Buffer.
• Supports atomic batch writes.
• Allows snapshots for consistent views of data.

Contents

• Requests for support are to be addressed to: vasp.materialphysik@univie.ac.at.
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• Usage
• How It Works

Example

Install

Usage

db.open([directory], callback)

Opens a Medea key-value store.

directory: Optional. Defaults to medea in the current directory.

callback: Takes one error parameter.

db.get(key, [snapshot], callback)

Returns the value associated with the given key.

key: identifier to retrieve the value

snapshot: a snapshot on which to query. optional.

callback: has the signature function (err, value) where value is the returned value.

db.put(key, value, callback)

Stores a value in Medea.

key: identifier

value: value associated with the key

callback: function that takes an error parameter

db.remove(key, callback)

Removes an entry from Medea.

key: identifier for the item to remove

callback: Takes one error parameter.

db.createSnapshot()

Creates a transient snapshot of the data. Works with db.get(key, [snapshot], callback).

Returns a Snapshot object.

Example:

db.createBatch()

Creates a batch object for atomic writes. Works with db.write(batch, callback).

Returns a WriteBatch object.

db.write(batch, callback)

Commits put and remove operations atomically.

batch: a WriteBatch object created with db.createBatch().

callback: Takes one error parameter.

Example:

db.sync(callback)

Performs an fsync operation on the active data and hint files.

db.close(callback)

Closes Medea.

db.listKeys(callback)

Returns an array of keys from the key-value store.

callback: A function that takes two parameters: an error and the array of keys.

db.mapReduce(options, callback)

Experimental.

Ad-hoc map-reduce queries over the key-value pairs. The query results are not indexed. A more robust map-reduce implementation will be provided in the near future.

See examples/map_reduce.js for an example.

db.compact(callback)

Runs a compaction process on the database files. Reduces size of data on disk. Deletes old log entries.

callback: A function that takes an error parameter.

db.destroy(callback) / medea.destroy(director, callback)

Destroys the database. If the folder only includes medea-files, the folder is removed also otherwise only the medea-files are removed and the folder is kept.

How it Works

All Medea key-value stores reside on the file system in a directory. The directory is made up of data files, hint files, and lock files. All keys are held in an in-memory keydir for fast lookup. More explanation is below.

Keydir

The keydir resides in memory. It contains a key, an associated data file ID, a value size, and a file offset. When a get is requested, a lookup happens in the keydir. The keydir entry allows one disk seek for each get operation. When a put or remove occurs, the value is updated in the keydir after the update occurs on-disk. The key set must fit in memory.

Data Files

Format: {seq}.medea.data where {seq} is an incrementing number.

A new data file is created each time a Medea store is opened or after an active data file reaches a configured size limit. Data files are opened in an append-only mode and act as a log. For every put and remove a new entry is inserted into the currently active data file. Each entry contains a timestamp, the key size, the value size, the key, and the value itself. In addition, a CRC32 checksum is calculated, which can be used to test the integrity of the entry.

When existing keys are updated with new values, new entries are appended to the end of the data file. Note: When values are removed, the entry to the data file looks just like a put, but with a special tombstone value.

Hint Files

Format: {seq}.medea.hint where {seq} is an incrementing number.

Each data file has an associated hint file. Entries in a hint file contain a timestamp, a key size, a value size, an offset, and the key itself. The offset points to the latest value entry for a particular key. Hint files are used to build a new keydir when a Medea store is opened. This is much quicker than reading through the data files.

Lock files

Format: medea.write.lock

Contains a process ID and the active file path.

Limitations

Currently, multiple processes cannot access the same data directory. Run one process per directory. A workaround has been developed for servers using Node's cluster module. Check out medea-clusterify to see how it works!

Repeated use leads to fragmentation and empty files. The compaction process needs to be run for cleanup. See: db.compact(callback).

Medea's design places all keys in memory. Therefore, the entire key set must fit in memory. All values are stored on disk.

License

MIT

Copyright 2013 Apigee Corporation and Contributors

Medea Vasp Download For Windows 10

Médée is a French languageopéra-comique by Luigi Cherubini. The libretto by François-Benoît Hoffman (Nicolas Étienne Framéry) was based on Euripides' tragedy of Medea and Pierre Corneille's play Médée.^[1] It is set in the ancient city of Corinth.^[2]

The opera was premiered on 13 March 1797 at the Théâtre Feydeau, Paris.^[3] It met with a lukewarm reception and was not immediately revived. During the twentieth century, it was usually performed in Italian translation as Medea, with the spoken dialogue replaced by recitatives not authorized by the composer. More recently, opera companies have returned to Cherubini's original version.

The long-lost final aria, which Cherubini appears to have elided from his original manuscript, was discovered by researchers from the University of Manchester and Stanford University by employing x-ray techniques to reveal the blackened out areas of Cherubini's manuscript.^[4]

• 1Performances and versions
• 3Synopsis

Performances and versions[edit]

Several versions of the opera were produced and staged in Italian and German:

• 1800: German translation by Karl Alexander Herklots was premiered in Berlin on 17 February 1800
• 1802: Another German translation by Georg Friedrich Treitschke was premiered in Vienna on 6 November 1802.
• 1809: The shortened version of the Treitschke translation was given in Vienna, where Cherubini produced a version which omitted some 500 bars of music
• 1855: Franz Lachner's German version was given in Frankfurt. This was based on the shortened Vienna version, but with recitatives composed by Lachner which replaced the spoken dialogue.
• 1865: The United Kingdom premiere was given in Italian at Her Majesty's Theatre on 6 June, with recitatives by Luigi Arditi, and Thérèse Tietjens in the title role. Cherubini's son and grandson were among the audience. This performance received a highly enthusiastic review in The Times.^[5]

• 1909: The Italian translation of the Lachner version by Carlo Zangarini was prepared for its Italian premiere at the Teatro alla Scala, on 30 December 1909, and starred Ester Mazzoleni. It was this hybrid version that was revived in 1953 for Maria Callas.

Callas revivals (1953-1962)[edit]

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Perhaps the most famous 20th-century revival of the work was in Florence in 1953, with Maria Callas in the title role, conducted by Vittorio Gui. Callas learned and performed the role within a week, to critical acclaim. The production was so successful that the Teatro alla Scala decided to stage this opera during the opening week of its 1953-1954 season, with Leonard Bernstein filling in for an indisposed Victor de Sabata and staged by Margherita Wallmann.

Callas performed the role throughout the 1950s and early 1960s, with possibly the most famous production being by the Dallas Opera in 1958, conducted by Nicola Rescigno (with Jon Vickers as Jason) and directed by the Greek director Alexis Minotis. This production traveled to the Royal Opera House, Covent Garden, in London in 1959, in the Ancient Theatre of Epidaurus in 1961 with the collaboration of the Greek National Opera and to La Scala (where a few minutes of it were filmed) in 1961-62. It was in these performances that Callas made her last appearances in Italy.

The Rescigno–Minotis production was successfully revived again for Magda Olivero in Dallas (1967) and Kansas City (1968).

Late 20th-century revivals[edit]

• 1984 - 1995: Revivals of the original French version were given at the Buxton Festival on 28 July 1984; at The Royal Opera House, Covent Garden on 6 November 1989; and at the Valle d'Itria Festival on 4 August 1995.
• 1996: The shortened Vienna version was given in an English translation and sung in English by Opera North in Leeds in April 1996.
• March 1997: A Bicentennial production by Opera Quotannis presented an unabridged (text and music) version (with a period-instrument orchestra) of the original opéra-comique at Alice Tully Hall, Lincoln Center, commemorating the bicentennial of the premiere. Bart Folse conducted Brian Morgan's stylized production, which featured Phyllis Treigle (in the title role), Carl Halvorson (as Jason), D'Anna Fortunato (as Néris), David Arnold (as Créon), Thaïs St Julien (as Dircé), and Jayne West and Andrea Matthews (as the Handmaidens of Dircé). Peter G. Davis, in New York magazine, wrote that 'Opera Quotannis delivers Cherubini's Médée in all its original glory.... The occasion proved that the real Médée is indeed a masterpiece. Its weak sister, the doctored Medea we've been hearing all these years, should now be permanently set aside.' Newport Classic subsequently recorded the production for Compact Disc.

The role of Médée is famed for its difficulty. Other famous interpreters of the role in the 20th century included Dame Josephine Barstow, Montserrat Caballé, Eileen Farrell, Marisa Galvany, Leyla Gencer, Dame Gwyneth Jones, Nadja Michael, Maralin Niska, Leonie Rysanek, Sylvia Sass, Anja Silja, Dunja Vejzovic, and Shirley Verrett. Anna Caterina Antonacci performed the Italian version in the first decade of the 21st century: the recording of a performance from the 2008 Turin edition has been released on DVD.

Roles[edit]

Synopsis[edit]

Place: Corinth

Time: Antiquity

Act 1[edit]

Outside the palace of King Créon

Dircé is preparing for her wedding to Jason. Years ago, Jason had stolen the golden fleece with the help of Médée, who had betrayed her family and established a relationship with Jason, the result of which was two children. Although Jason has since abandoned Médée, she reappears and demands that he return to her. Jason refuses and Médée curses him, swearing vengeance.

Act 2[edit]

Inside the palace

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In despair, Médée is encouraged by her slave, Néris, to leave the city. Créon then appears and orders that Médée leave. She asks for one more day with her children and, after the king agrees, she appears to be calmer and gives Néris two wedding presents to take to her rival.

Act 3[edit]

Between the palace and the temple

Néris brings the two children out to where Médée is waiting. Sounds of lamentation are heard from within the palace and it is discovered that one of Médée's wedding presents has poisoned Dircé. An angry crowd gathers and Néris, Médée, and the children take refuge in the temple. The two women reappear with Médée grasping a blood-stained knife with which she has killed her two children. The temple, to which Médée returns, goes up in flames.

Recordings[edit]

Original French version:

Italian translation, with recitatives by Franz Lachner:

References[edit]

Notes

1. ^Information from Operone website
2. ^Giorgio Bagnoli (1993). The La Scala Encyclopedia of the Opera. Simon and Schuster. p. 247.
3. ^'Médée'. Royal Opera House Collections.
4. ^'Cherubini opera restored after 200 years' on bbc.co.uk, 14 June 2013. Retrieved 15 June 2013
5. ^Review: 'Her Majestys [sic] Theatre'. In The Times, Wednesday, June 7, 1865, p. 12, col. F.
6. ^According to Alberto Batisti, Medée, in Gelli, Piero & Poletti, Filippo (ed.), Dizionario dell'Opera 2008, Milan, Baldini Castoldi Dalai, 2007, pp. 289-290, ISBN 978-88-6073- 184-5 (reproduced online at Opera Manager).
7. ^According to the original libretto: Médée, Tragédie en trois actes en vers, Paroles de Hoffmann, Musique de Chérubini, Représentée sur le Théâtre Feydeau, le 23 Ventôse, Paris, Huet, 1797 (accessible online at ebook Google).
8. ^In the Italian version the character is named 'Glauce' which is also the name used in the ancient Greek version (Γλαυκή).
9. ^ ^abRecordings on operadis-opera-discography.org.uk

External links[edit]

• Tsippi Fleischer: Luigi Cherubini's Médée (1797): A Study of its Musical and Dramatic Style (including historical sources). UMI Company Microform 9817686. Ann Arbor, MI (USA), 1998. Full PDF text available for download from the author's website.