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README.md
logger.properties
logger.properties
pom.xml
pom.xml

Repository files navigation

MapDB: database engine

Build StatusMaven CentralJoin the chat at https://gitter.im/jankotek/mapdb

MapDB combines embedded database engine and Java collections. It is free under Apache 2 license. MapDB is flexible and can be used in many roles:

  • Drop-in replacement for Maps, Lists, Queues and other collections.
  • Off-heap collections not affected by Garbage Collector
  • Multilevel cache with expiration and disk overflow.
  • RDBMs replacement with transactions, MVCC, incremental backups etc…
  • Local data processing and filtering. MapDB has utilities to process huge quantities of data in reasonable time.

Hello world

Maven snippet, VERSION is Maven Central

<dependency>
<groupId>org.mapdb</groupId>
<artifactId>mapdb</artifactId>
<version>VERSION</version>
</dependency>

Hello world:

 //import org.mapdb.*
DB db = DBMaker.memoryDB().make();
ConcurrentMap map = db.hashMap("map").make();
map.put("something", "here");

Continue at Quick Start or at Documentation.

Support

More details.

Development

MapDB is written in Kotlin. You will need Intellij Idea 15 Community Edition to edit it.

Use Maven to build MapDB: mvn install

You might experience problem with mapdb-jcache-tck-test module. It expects mapdb-jcache module to be already installed in local maven repo. Source code module dependency does not work. To run all tests use command: mvn install test

MapDB comes with extensive unit tests, by default only tiny fraction is executed, so build finishes under 10 minutes. Full test suite has over million test cases and runs several hours/days. To run full test suite set -Dmdbtest=1 property. It is recommended to run tests in parallel: -DthreadCount=16. It is also possible to override temporary folder with -Djava.io.tmpdir=/path directive.

An example to run full acceptance tests:

mvn clean install test -Dmdbtest=1 -DthreadCount=16 -Djava.io.tmpdir=/mnt/big

About

MapDB provides concurrent Maps, Sets and Queues backed by disk storage or off-heap-memory. It is a fast and easy to use embedded Java database engine.

www.mapdb.org

Resources

Readme
Apache-2.0 license
Activity

Stars

0 stars

Watchers

1 watching

Forks

0 forks
Report repository

Releases

Packages

Contributors

Languages

, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
 blocks\n(function() {\n function addCopyButtons() {\n document.querySelectorAll('pre code').forEach(function(codeBlock) {\n if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;\n codeBlock.parentElement.setAttribute('data-copy-added', 'true');\n \n var btn = document.createElement('button');\n btn.textContent = 'Copy';\n btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';\n btn.onmouseover = function() { this.style.opacity = '1'; };\n btn.onmouseout = function() { this.style.opacity = '0.7'; };\n btn.onclick = function() {\n navigator.clipboard.writeText(codeBlock.textContent).then(function() {\n btn.textContent = 'Copied!';\n setTimeout(function() { btn.textContent = 'Copy'; }, 1500);\n });\n };\n codeBlock.parentElement.style.position = 'relative';\n codeBlock.parentElement.appendChild(btn);\n });\n }\n \n addCopyButtons();\n \n // Re-run on dynamic content\n var observer = new MutationObserver(addCopyButtons);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Add Copy Buttons to Code Blocks");
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

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logger.properties
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pom.xml
Repository files navigation
MapDB: database engine
Build StatusMaven CentralJoin the chat at https://gitter.im/jankotek/mapdb
MapDB combines embedded database engine and Java collections.
It is free under Apache 2 license. MapDB is flexible and can be used in many roles:
  • Drop-in replacement for Maps, Lists, Queues and other collections.
  • Off-heap collections not affected by Garbage Collector
  • Multilevel cache with expiration and disk overflow.
  • RDBMs replacement with transactions, MVCC, incremental backups etc…
  • Local data processing and filtering. MapDB has utilities to process huge quantities of data in reasonable time.
Hello world
Maven snippet, VERSION is Maven Central
<dependency>
<groupId>org.mapdb</groupId>
<artifactId>mapdb</artifactId>
<version>VERSION</version>
</dependency>

Hello world:
 //import org.mapdb.*
DB db = DBMaker.memoryDB().make();
ConcurrentMap map = db.hashMap("map").make();
map.put("something", "here");

Continue at Quick Start or at Documentation.
Support
More details.
Development
MapDB is written in Kotlin. You will need Intellij Idea 15 Community Edition to edit it.
Use Maven to build MapDB: mvn install
You might experience problem with mapdb-jcache-tck-test module.
It expects mapdb-jcache module to be already installed in local maven repo.
Source code module dependency does not work. To run all tests use command: mvn install test
MapDB comes with extensive unit tests, by default only tiny fraction is executed, so build finishes under 10 minutes.
Full test suite has over million test cases and runs several hours/days.
To run full test suite set -Dmdbtest=1 property.
It is recommended to run tests in parallel: -DthreadCount=16.
It is also possible to override temporary folder with -Djava.io.tmpdir=/path directive.
An example to run full acceptance tests:
mvn clean install test -Dmdbtest=1 -DthreadCount=16 -Djava.io.tmpdir=/mnt/big

About
MapDB provides concurrent Maps, Sets and Queues backed by disk storage or off-heap-memory. It is a fast and easy to use embedded Java database engine.
www.mapdb.org
Resources
Readme
Apache-2.0 license
Activity
Stars
0 stars
Watchers
1 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix");
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
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Folders and files
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README.md
logger.properties
logger.properties
pom.xml
pom.xml
Repository files navigation
MapDB: database engine
Build StatusMaven CentralJoin the chat at https://gitter.im/jankotek/mapdb
MapDB combines embedded database engine and Java collections.
It is free under Apache 2 license. MapDB is flexible and can be used in many roles:
  • Drop-in replacement for Maps, Lists, Queues and other collections.
  • Off-heap collections not affected by Garbage Collector
  • Multilevel cache with expiration and disk overflow.
  • RDBMs replacement with transactions, MVCC, incremental backups etc…
  • Local data processing and filtering. MapDB has utilities to process huge quantities of data in reasonable time.
Hello world
Maven snippet, VERSION is Maven Central
<dependency>
<groupId>org.mapdb</groupId>
<artifactId>mapdb</artifactId>
<version>VERSION</version>
</dependency>

Hello world:
 //import org.mapdb.*
DB db = DBMaker.memoryDB().make();
ConcurrentMap map = db.hashMap("map").make();
map.put("something", "here");

Continue at Quick Start or at Documentation.
Support
More details.
Development
MapDB is written in Kotlin. You will need Intellij Idea 15 Community Edition to edit it.
Use Maven to build MapDB: mvn install
You might experience problem with mapdb-jcache-tck-test module.
It expects mapdb-jcache module to be already installed in local maven repo.
Source code module dependency does not work. To run all tests use command: mvn install test
MapDB comes with extensive unit tests, by default only tiny fraction is executed, so build finishes under 10 minutes.
Full test suite has over million test cases and runs several hours/days.
To run full test suite set -Dmdbtest=1 property.
It is recommended to run tests in parallel: -DthreadCount=16.
It is also possible to override temporary folder with -Djava.io.tmpdir=/path directive.
An example to run full acceptance tests:
mvn clean install test -Dmdbtest=1 -DthreadCount=16 -Djava.io.tmpdir=/mnt/big

About
MapDB provides concurrent Maps, Sets and Queues backed by disk storage or off-heap-memory. It is a fast and easy to use embedded Java database engine.
www.mapdb.org
Resources
Readme
Apache-2.0 license
Activity
Stars
0 stars
Watchers
1 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms");
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
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1,842 Commits
Folders and files
NameName
Last commit message
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src
src
.gitignore
.gitignore
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.travis.yml
LICENSE.txt
LICENSE.txt
README.md
README.md
logger.properties
logger.properties
pom.xml
pom.xml
Repository files navigation
MapDB: database engine
Build StatusMaven CentralJoin the chat at https://gitter.im/jankotek/mapdb
MapDB combines embedded database engine and Java collections.
It is free under Apache 2 license. MapDB is flexible and can be used in many roles:
  • Drop-in replacement for Maps, Lists, Queues and other collections.
  • Off-heap collections not affected by Garbage Collector
  • Multilevel cache with expiration and disk overflow.
  • RDBMs replacement with transactions, MVCC, incremental backups etc…
  • Local data processing and filtering. MapDB has utilities to process huge quantities of data in reasonable time.
Hello world
Maven snippet, VERSION is Maven Central
<dependency>
<groupId>org.mapdb</groupId>
<artifactId>mapdb</artifactId>
<version>VERSION</version>
</dependency>

Hello world:
 //import org.mapdb.*
DB db = DBMaker.memoryDB().make();
ConcurrentMap map = db.hashMap("map").make();
map.put("something", "here");

Continue at Quick Start or at Documentation.
Support
More details.
Development
MapDB is written in Kotlin. You will need Intellij Idea 15 Community Edition to edit it.
Use Maven to build MapDB: mvn install
You might experience problem with mapdb-jcache-tck-test module.
It expects mapdb-jcache module to be already installed in local maven repo.
Source code module dependency does not work. To run all tests use command: mvn install test
MapDB comes with extensive unit tests, by default only tiny fraction is executed, so build finishes under 10 minutes.
Full test suite has over million test cases and runs several hours/days.
To run full test suite set -Dmdbtest=1 property.
It is recommended to run tests in parallel: -DthreadCount=16.
It is also possible to override temporary folder with -Djava.io.tmpdir=/path directive.
An example to run full acceptance tests:
mvn clean install test -Dmdbtest=1 -DthreadCount=16 -Djava.io.tmpdir=/mnt/big

About
MapDB provides concurrent Maps, Sets and Queues backed by disk storage or off-heap-memory. It is a fast and easy to use embedded Java database engine.
www.mapdb.org
Resources
Readme
Apache-2.0 license
Activity
Stars
0 stars
Watchers
1 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links");
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

Skip to content
BranchesTags
Latest commit
History
1,842 Commits
Folders and files
NameName
Last commit message
Last commit date
src
src
.gitignore
.gitignore
.travis.yml
.travis.yml
LICENSE.txt
LICENSE.txt
README.md
README.md
logger.properties
logger.properties
pom.xml
pom.xml
Repository files navigation
MapDB: database engine
Build StatusMaven CentralJoin the chat at https://gitter.im/jankotek/mapdb
MapDB combines embedded database engine and Java collections.
It is free under Apache 2 license. MapDB is flexible and can be used in many roles:
  • Drop-in replacement for Maps, Lists, Queues and other collections.
  • Off-heap collections not affected by Garbage Collector
  • Multilevel cache with expiration and disk overflow.
  • RDBMs replacement with transactions, MVCC, incremental backups etc…
  • Local data processing and filtering. MapDB has utilities to process huge quantities of data in reasonable time.
Hello world
Maven snippet, VERSION is Maven Central
<dependency>
<groupId>org.mapdb</groupId>
<artifactId>mapdb</artifactId>
<version>VERSION</version>
</dependency>

Hello world:
 //import org.mapdb.*
DB db = DBMaker.memoryDB().make();
ConcurrentMap map = db.hashMap("map").make();
map.put("something", "here");

Continue at Quick Start or at Documentation.
Support
More details.
Development
MapDB is written in Kotlin. You will need Intellij Idea 15 Community Edition to edit it.
Use Maven to build MapDB: mvn install
You might experience problem with mapdb-jcache-tck-test module.
It expects mapdb-jcache module to be already installed in local maven repo.
Source code module dependency does not work. To run all tests use command: mvn install test
MapDB comes with extensive unit tests, by default only tiny fraction is executed, so build finishes under 10 minutes.
Full test suite has over million test cases and runs several hours/days.
To run full test suite set -Dmdbtest=1 property.
It is recommended to run tests in parallel: -DthreadCount=16.
It is also possible to override temporary folder with -Djava.io.tmpdir=/path directive.
An example to run full acceptance tests:
mvn clean install test -Dmdbtest=1 -DthreadCount=16 -Djava.io.tmpdir=/mnt/big

About
MapDB provides concurrent Maps, Sets and Queues backed by disk storage or off-heap-memory. It is a fast and easy to use embedded Java database engine.
www.mapdb.org
Resources
Readme
Apache-2.0 license
Activity
Stars
0 stars
Watchers
1 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default");
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
BranchesTags
Latest commit
History
1,842 Commits
Folders and files
NameName
Last commit message
Last commit date
src
src
.gitignore
.gitignore
.travis.yml
.travis.yml
LICENSE.txt
LICENSE.txt
README.md
README.md
logger.properties
logger.properties
pom.xml
pom.xml
Repository files navigation
MapDB: database engine
Build StatusMaven CentralJoin the chat at https://gitter.im/jankotek/mapdb
MapDB combines embedded database engine and Java collections.
It is free under Apache 2 license. MapDB is flexible and can be used in many roles:
  • Drop-in replacement for Maps, Lists, Queues and other collections.
  • Off-heap collections not affected by Garbage Collector
  • Multilevel cache with expiration and disk overflow.
  • RDBMs replacement with transactions, MVCC, incremental backups etc…
  • Local data processing and filtering. MapDB has utilities to process huge quantities of data in reasonable time.
Hello world
Maven snippet, VERSION is Maven Central
<dependency>
<groupId>org.mapdb</groupId>
<artifactId>mapdb</artifactId>
<version>VERSION</version>
</dependency>

Hello world:
 //import org.mapdb.*
DB db = DBMaker.memoryDB().make();
ConcurrentMap map = db.hashMap("map").make();
map.put("something", "here");

Continue at Quick Start or at Documentation.
Support
More details.
Development
MapDB is written in Kotlin. You will need Intellij Idea 15 Community Edition to edit it.
Use Maven to build MapDB: mvn install
You might experience problem with mapdb-jcache-tck-test module.
It expects mapdb-jcache module to be already installed in local maven repo.
Source code module dependency does not work. To run all tests use command: mvn install test
MapDB comes with extensive unit tests, by default only tiny fraction is executed, so build finishes under 10 minutes.
Full test suite has over million test cases and runs several hours/days.
To run full test suite set -Dmdbtest=1 property.
It is recommended to run tests in parallel: -DthreadCount=16.
It is also possible to override temporary folder with -Djava.io.tmpdir=/path directive.
An example to run full acceptance tests:
mvn clean install test -Dmdbtest=1 -DthreadCount=16 -Djava.io.tmpdir=/mnt/big

About
MapDB provides concurrent Maps, Sets and Queues backed by disk storage or off-heap-memory. It is a fast and easy to use embedded Java database engine.
www.mapdb.org
Resources
Readme
Apache-2.0 license
Activity
Stars
0 stars
Watchers
1 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers");
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
BranchesTags
Latest commit
History
1,842 Commits
Folders and files
NameName
Last commit message
Last commit date
src
src
.gitignore
.gitignore
.travis.yml
.travis.yml
LICENSE.txt
LICENSE.txt
README.md
README.md
logger.properties
logger.properties
pom.xml
pom.xml
Repository files navigation
MapDB: database engine
Build StatusMaven CentralJoin the chat at https://gitter.im/jankotek/mapdb
MapDB combines embedded database engine and Java collections.
It is free under Apache 2 license. MapDB is flexible and can be used in many roles:
  • Drop-in replacement for Maps, Lists, Queues and other collections.
  • Off-heap collections not affected by Garbage Collector
  • Multilevel cache with expiration and disk overflow.
  • RDBMs replacement with transactions, MVCC, incremental backups etc…
  • Local data processing and filtering. MapDB has utilities to process huge quantities of data in reasonable time.
Hello world
Maven snippet, VERSION is Maven Central
<dependency>
<groupId>org.mapdb</groupId>
<artifactId>mapdb</artifactId>
<version>VERSION</version>
</dependency>

Hello world:
 //import org.mapdb.*
DB db = DBMaker.memoryDB().make();
ConcurrentMap map = db.hashMap("map").make();
map.put("something", "here");

Continue at Quick Start or at Documentation.
Support
More details.
Development
MapDB is written in Kotlin. You will need Intellij Idea 15 Community Edition to edit it.
Use Maven to build MapDB: mvn install
You might experience problem with mapdb-jcache-tck-test module.
It expects mapdb-jcache module to be already installed in local maven repo.
Source code module dependency does not work. To run all tests use command: mvn install test
MapDB comes with extensive unit tests, by default only tiny fraction is executed, so build finishes under 10 minutes.
Full test suite has over million test cases and runs several hours/days.
To run full test suite set -Dmdbtest=1 property.
It is recommended to run tests in parallel: -DthreadCount=16.
It is also possible to override temporary folder with -Djava.io.tmpdir=/path directive.
An example to run full acceptance tests:
mvn clean install test -Dmdbtest=1 -DthreadCount=16 -Djava.io.tmpdir=/mnt/big

About
MapDB provides concurrent Maps, Sets and Queues backed by disk storage or off-heap-memory. It is a fast and easy to use embedded Java database engine.
www.mapdb.org
Resources
Readme
Apache-2.0 license
Activity
Stars
0 stars
Watchers
1 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode");
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

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MapDB: database engine
Build StatusMaven CentralJoin the chat at https://gitter.im/jankotek/mapdb
MapDB combines embedded database engine and Java collections.
It is free under Apache 2 license. MapDB is flexible and can be used in many roles:
  • Drop-in replacement for Maps, Lists, Queues and other collections.
  • Off-heap collections not affected by Garbage Collector
  • Multilevel cache with expiration and disk overflow.
  • RDBMs replacement with transactions, MVCC, incremental backups etc…
  • Local data processing and filtering. MapDB has utilities to process huge quantities of data in reasonable time.
Hello world
Maven snippet, VERSION is Maven Central
<dependency>
<groupId>org.mapdb</groupId>
<artifactId>mapdb</artifactId>
<version>VERSION</version>
</dependency>

Hello world:
 //import org.mapdb.*
DB db = DBMaker.memoryDB().make();
ConcurrentMap map = db.hashMap("map").make();
map.put("something", "here");

Continue at Quick Start or at Documentation.
Support
More details.
Development
MapDB is written in Kotlin. You will need Intellij Idea 15 Community Edition to edit it.
Use Maven to build MapDB: mvn install
You might experience problem with mapdb-jcache-tck-test module.
It expects mapdb-jcache module to be already installed in local maven repo.
Source code module dependency does not work. To run all tests use command: mvn install test
MapDB comes with extensive unit tests, by default only tiny fraction is executed, so build finishes under 10 minutes.
Full test suite has over million test cases and runs several hours/days.
To run full test suite set -Dmdbtest=1 property.
It is recommended to run tests in parallel: -DthreadCount=16.
It is also possible to override temporary folder with -Djava.io.tmpdir=/path directive.
An example to run full acceptance tests:
mvn clean install test -Dmdbtest=1 -DthreadCount=16 -Djava.io.tmpdir=/mnt/big

About
MapDB provides concurrent Maps, Sets and Queues backed by disk storage or off-heap-memory. It is a fast and easy to use embedded Java database engine.
www.mapdb.org
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