feat: named contexts are ephemeral

Signed-off-by: Leo Galambos <lg@hq.egothor.org>

.gitea/workflows/release.yml

@@ -31,14 +31,18 @@ jobs:
           restore-keys: |
             ${{ runner.os }}-gradle-
 
-      - name: Build and publish to Gitea Maven
-        run: ./gradlew clean publish --no-daemon -PgiteaToken=${{ secrets.CI_PUBLISH_TOKEN }}
+      - name: Setup SSH key and rsync
+        run: |
+          mkdir -p ~/.ssh
+          echo "${{ secrets.JAVADOC_SSH_PRIVATE_KEY }}" > ~/.ssh/id_rsa
+          echo "${{ secrets.CI_KNOWN_HOSTS }}" > ~/.ssh/known_hosts
+          chmod -R 600 ~/.ssh
+          rm /etc/apt/sources.list.d/microsoft-prod.list
+          apt-get update
+          apt install -y rsync
 
-      - name: Upload built JAR
-        uses: actions/upload-artifact@v3
-        with:
-          name: conflux
-          path: build/libs/*.jar
+      - name: Build and publish to Gitea Maven and JavaDoc to the website
+        run: ./gradlew clean publish uploadJavadoc --no-daemon -PgiteaToken=${{ secrets.CI_PUBLISH_TOKEN }} -PjavadocUser=${{ vars.JAVADOC_USER }} -PjavadocHost=${{ vars.JAVADOC_HOST }} -PjavadocPath=${{ vars.JAVADOC_PATH }} -PjavadocKeyPath=~/.ssh/id_rsa
 
       - name: Generate release notes
         id: notes

.gitea/workflows/tag.yml

@@ -40,7 +40,7 @@ jobs:
 
       - name: Bump version and tag
         run: |
-          latest=$(git tag --list 'conflux@*' | sed 's/conflux@//' | sort -V | tail -n 1)
+          latest=$(git tag --list 'release@*' | sed 's/release@//' | sort -V | tail -n 1)
           if [[ -z "$latest" ]]; then
             latest="0.0.0"
           fi
@@ -59,7 +59,7 @@ jobs:
               ;;
           esac
           next="$major.$minor.$patch"
-          new_tag="conflux@$next"
+          new_tag="release@$next"
           git tag -s $new_tag -m "Release $new_tag"
           git push origin $new_tag
           echo "Tagged $new_tag"

.project

@@ -15,15 +15,9 @@
 			<arguments>
 			</arguments>
 		</buildCommand>
-		<buildCommand>
-			<name>net.sourceforge.pmd.eclipse.plugin.pmdBuilder</name>
-			<arguments>
-			</arguments>
-		</buildCommand>
 	</buildSpec>
 	<natures>
 		<nature>org.eclipse.jdt.core.javanature</nature>
 		<nature>org.eclipse.buildship.core.gradleprojectnature</nature>
-		<nature>net.sourceforge.pmd.eclipse.plugin.pmdNature</nature>
 	</natures>
 </projectDescription>

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@@ -0,0 +1,298 @@
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README.md

@@ -12,3 +12,28 @@ values and react to their changes in a clean and decoupled way.
 - Publish/subscribe event bus for listening to value changes
 - Simple API for easy integration into existing projects
 - Enables modular design by decoupling components through events
+
+## Getting Started
+
+Add to your `build.gradle`:
+```groovy
+repositories {
+    
+    maven {
+        name = "GiteaMaven"
+        url = uri("https://gitea.egothor.org/api/packages/Egothor/maven")
+    }
+    
+    // Use Maven Central for resolving dependencies.
+    mavenCentral()
+}
+
+dependencies {
+    implementation 'org.egothor:conflux:x.x.x'
+}
+```
+
+## Documentation
+
+- [Conflux JavaDoc](https://www.egothor.org/javadoc/conflux/)
+- [Conflux Wiki](https://gitea.egothor.org/Egothor/conflux/wiki)

build.gradle

@@ -3,8 +3,13 @@ plugins {
     id 'java-library'
     id 'maven-publish'
     id 'com.palantir.git-version' version '4.0.0'
+    id 'pmd'
 }
 
+import java.time.LocalDate
+
+def currentYear=LocalDate.now().getYear()
+
 group 'org.egothor'
 version gitVersion(prefix:'release@')
 
@@ -20,6 +25,13 @@ dependencies {
     testRuntimeOnly("org.junit.platform:junit-platform-launcher")
 }
 
+pmd {
+	consoleOutput = true
+	toolVersion = '7.16.0'
+	sourceSets = [sourceSets.main]
+	ruleSetFiles = files(rootProject.file(".ruleset"))
+}
+
 // Apply a specific Java toolchain to ease working on different environments.
 java {
     toolchain {
@@ -32,15 +44,51 @@ java {
 
 javadoc {
     failOnError = false
-}
+    
+    options.addBooleanOption('html5', true)
+    options.tags('apiNote:a:API Note:')
+    options.tags('implSpec:a:Implementation Requirements:')
+    options.tags('implNote:a:Implementation Note:')
+    options.tags('param')
+    options.tags('return')
+    options.tags('throws')
+    options.tags('since')
+    options.tags('version')
+    options.tags('serialData')
+    options.tags('factory')
+    options.tags('see')
+    
+    options.use = true
+    options.author = true
+    options.version = true
+    options.windowTitle = 'Conflux'
+    
+    options.bottom = '<div style="text-align: right; padding: 5px;">Copyright &copy; ' + currentYear +
+                     ' Egothor - Version ' + version +
+                     ' - <a href="https://gitea.egothor.org/Egothor/conflux/raw/branch/main/LICENSE">License</a>' +
+                     '</div>'
+    source = sourceSets.main.allJava}
 
 tasks.named('test') {
     // Use JUnit Platform for unit tests.
     useJUnitPlatform()
 }
 
-tasks.withType(Javadoc).configureEach {
-    options.bottom = "Copyright &copy; 2025 Egothor"
+task uploadJavadoc(type: Exec) {
+    dependsOn javadoc
+
+    doFirst {
+        def javadocDir = tasks.javadoc.destinationDir
+        def relativeJavadocDir = project.projectDir.toPath().relativize(javadocDir.toPath()).toString()
+
+        println "Uploading Javadoc with key: ${javadocKeyPath}"
+        println "                  from relative path: $relativeJavadocDir"
+
+        commandLine "rsync", "-avz", "--delete",
+          "-e", "ssh -i ${javadocKeyPath} -o IdentitiesOnly=yes",
+          relativeJavadocDir + '/', "${javadocUser}@${javadocHost}:${javadocPath}"
+    }
+
 }
 
 if (project.hasProperty('giteaToken') && project.giteaToken) {

gradle.properties

@@ -0,0 +1 @@
+javadocPath=/var/www/html/javadoc/conflux/

src/main/java/conflux/Ctx.java

@@ -34,169 +34,262 @@
  */
 package conflux;
 
+import java.lang.ref.ReferenceQueue;
 import java.lang.ref.WeakReference;
-import java.util.List;
 import java.util.Map;
-import java.util.Objects;
+import java.util.Set;
 import java.util.concurrent.ConcurrentHashMap;
-import java.util.concurrent.CopyOnWriteArrayList;
+import java.util.stream.Collectors;
 
 /**
- * A globally accessible, type-safe context for sharing data between independent
- * parts of an application. Supports listeners that are notified whenever a
- * registered key's value changes.
+ * A central context manager for storing and retrieving key-value pairs in a
+ * thread-safe, type-safe manner.
  * 
- * This implementation guarantees:
+ * This enum serves as both:
  * <ul>
- * <li>Strongly typed keys using {@link Key}</li>
- * <li>One consistent type per key name</li>
- * <li>Support for weak-referenced listeners to avoid memory leaks</li>
- * <li>Thread-safe operations</li>
+ * <li>A singleton context via {@code Ctx.INSTANCE} for global/shared usage</li>
+ * <li>A factory and registry for multiple named independent contexts</li>
  * </ul>
  * 
- * Usage:
+ * Each context provides listener support for reactive value changes.
  *
- * <pre>
- * Key&lt;Integer> COUNT = Key.of("count", Integer.class);
- * Ctx.INSTANCE.put(COUNT, 42);
- * int v = Ctx.INSTANCE.get(COUNT);
- * </pre>
+ * @see Key
+ * @see Listener
  * 
  * @author Leo Galambos
  */
-public enum Ctx {
+public enum Ctx implements CtxInterface {
     /**
-     * Singleton instance of the context.
+     * The singleton instance representing the default/global context.
      */
     INSTANCE;
 
-    private final Map<Key<?>, Object> values = new ConcurrentHashMap<>();
-    private final Map<String, Class<?>> keyTypes = new ConcurrentHashMap<>();
-    private final Map<Key<?>, List<WeakReference<Listener<?>>>> listeners = new ConcurrentHashMap<>();
+    /**
+     * The default context instance used by this enum singleton. All interface
+     * method calls delegate to this context.
+     */
+    private final CtxInterface defaultCtx = new CtxInstance();
 
     /**
-     * Stores or updates the value for a given key. If the key is used for the first
-     * time, its type is recorded. If the key has been used before with a different
-     * type, an exception will be thrown.
-     *
-     * After setting the value, any registered listeners for that key will be
-     * notified (if the value was modified).
-     *
-     * @param key   the key
-     * @param value the value to store
-     * @param <T>   the type of the value
-     * @throws IllegalStateException if the key is reused with a different type
+     * A registry of named contexts, allowing for multiple isolated logical
+     * contexts.
      */
+    private final Map<String, NamedWeakRef> contexts = new ConcurrentHashMap<>();
+
+    /**
+     * A reference queue to learn when weakly referenced contexts are collected.
+     */
+    private final transient ReferenceQueue<CtxInterface> refQueue = new ReferenceQueue<>();
+
+    /**
+     * A weak reference wrapper that associates a {@link CtxInterface} instance (the
+     * referent) with its corresponding context name.
+     * <p>
+     * Instances of this class are enqueued into a {@link ReferenceQueue} once their
+     * referent becomes unreachable. The extra {@code name} field allows the owning
+     * registry to efficiently remove the corresponding entry from the context map
+     * without requiring a reverse lookup.
+     * </p>
+     *
+     * <h2>Usage</h2>
+     * <ul>
+     * <li>Created whenever a new named context is registered.</li>
+     * <li>Placed into a {@link ConcurrentHashMap} keyed by the same
+     * {@code name}.</li>
+     * <li>When the referent is garbage-collected, this reference is automatically
+     * enqueued, and the registry removes the map entry associated with
+     * {@link #name}.</li>
+     * </ul>
+     *
+     * <p>
+     * This design ensures that contexts are automatically deregistered when no
+     * strong references to them remain, preventing memory leaks while still
+     * allowing explicit removal via {@code removeContext}.
+     * </p>
+     */
+    private static final class NamedWeakRef extends WeakReference<CtxInterface> {
+        /**
+         * The context name associated with the referent.
+         */
+        private final String name;
+
+        /**
+         * Creates a new weak reference to the given context instance and associates it
+         * with the provided name.
+         *
+         * @param name     the context name; used as the key in the registry
+         * @param referent the context instance being weakly referenced
+         * @param q        the reference queue with which the weak reference is
+         *                 registered
+         */
+        private NamedWeakRef(String name, CtxInterface referent, ReferenceQueue<CtxInterface> q) {
+            super(referent, q);
+            this.name = name;
+        }
+    }
+
+    /**
+     * Remove collected references from map.
+     */
+    private void drainQueue() {
+        for (NamedWeakRef ref; (ref = (NamedWeakRef) refQueue.poll()) != null;) { // NOPMD
+            contexts.remove(ref.name, ref);
+        }
+    }
+
+    /**
+     * Returns a named context. If the context does not exist, it is lazily created.
+     * 
+     * This method allows isolation between different logical scopes (e.g.,
+     * sessions, users).
+     *
+     * @param name the name of the context
+     * @return the associated context instance
+     */
+    public CtxInterface getContext(String name) {
+        if (name == null || name.isBlank()) {
+            throw new IllegalArgumentException("name must not be null or blank");
+        }
+        drainQueue();
+        NamedWeakRef ref = contexts.compute(name, (k, existing) -> {
+            CtxInterface alive = existing == null ? null : existing.get();
+            if (alive != null) {
+                return existing;
+            }
+            CtxInterface created = new CtxInstance();
+            return new NamedWeakRef(k, created, refQueue);
+        });
+        CtxInterface ctx = ref.get();
+        if (ctx == null) {
+            CtxInterface created = new CtxInstance();
+            NamedWeakRef fresh = new NamedWeakRef(name, created, refQueue);
+            contexts.put(name, fresh);
+            ctx = created;
+        }
+        return ctx;
+    }
+
+    /**
+     * Removes a named context previously created via {@link #getContext(String)}.
+     * <p>
+     * The context is atomically removed from the internal registry and then
+     * {@linkplain CtxInterface#clear() cleared} to release stored values and
+     * listener references. This operation is thread-safe and idempotent: if the
+     * specified context does not exist, the method returns {@code false} and
+     * performs no action.
+     * </p>
+     * <p>
+     * Calling {@code getContext(name)} again after a successful removal will create
+     * a brand-new, empty context. The default/global context represented by
+     * {@link #INSTANCE} is not affected.
+     * </p>
+     *
+     * @param name the name of the context to remove; must not be {@code null} or
+     *             blank
+     * @return {@code true} if a context with the given name existed and was
+     *         removed; {@code false} otherwise
+     * @throws IllegalArgumentException if {@code name} is {@code null} or blank
+     * @implNote Uses {@link ConcurrentHashMap#remove(Object)} for atomic removal,
+     *           then invokes {@link CtxInterface#clear()} on the removed instance.
+     * @since 2025.08
+     */
+    public boolean removeContext(String name) {
+        if (name == null || name.isBlank()) {
+            throw new IllegalArgumentException("name must not be null or blank");
+        }
+        drainQueue();
+        NamedWeakRef ref = contexts.remove(name);
+        if (ref == null) {
+            return false; // NOPMD
+        }
+        CtxInterface ctx = ref.get();
+        if (ctx != null) {
+            try {
+                ctx.clear();
+            } catch (RuntimeException ignore) { // NOPMD
+            }
+        }
+        return true;
+    }
+
+    /**
+     * Returns the set of names for all currently registered contexts.
+     *
+     * @return an immutable set of context names
+     */
+    public Set<String> contextNames() {
+        drainQueue();
+        return Set.copyOf(contexts.entrySet().stream().filter(e -> e.getValue().get() != null).map(Map.Entry::getKey)
+                .collect(Collectors.toSet()));
+    }
+
+    /**
+     * {@inheritDoc}
+     * 
+     * Delegates to the default context instance.
+     */
+    @Override
     public <T> void put(Key<T> key, T value) {
-        keyTypes.compute(key.name(), (k, existingType) -> {
-            if (existingType == null) {
-                return key.type();
-            } else {
-                if (!existingType.equals(key.type())) {
-                    throw new IllegalStateException(
-                            "Key '" + key.name() + "' already associated with type " + existingType.getName());
-                }
-                return existingType;
-            }
-        });
-
-        @SuppressWarnings("unchecked")
-        T previous = (T) values.put(key, value);
-
-        if (Objects.deepEquals(value, previous)) {
-            // no change
-            return;
-        }
-
-        // notify listeners
-        var list = listeners.get(key);
-        if (list != null) {
-            for (var ref : list) {
-                var listener = ref.get();
-                if (listener != null) {
-                    @SuppressWarnings("unchecked")
-                    Listener<T> typedListener = (Listener<T>) listener;
-                    typedListener.valueChanged(value);
-                }
-            }
-            // clean up dead weak references
-            list.removeIf(ref -> ref.get() == null);
-        }
+        defaultCtx.put(key, value);
     }
 
     /**
-     * Retrieves the value for the given key, or {@code null} if not set.
+     * {@inheritDoc}
      * 
-     * @param key the key
-     * @param <T> the type
-     * @return the stored value or null
+     * Delegates to the default context instance.
      */
-    @SuppressWarnings("unchecked")
+    @Override
     public <T> T get(Key<T> key) {
-        return (T) values.get(key);
+        return defaultCtx.get(key);
     }
 
     /**
-     * Checks if a value exists for the given key.
+     * {@inheritDoc}
      * 
-     * @param key the key
-     * @return true if a value is present
+     * Delegates to the default context instance.
      */
+    @Override
     public boolean contains(Key<?> key) {
-        return values.containsKey(key);
+        return defaultCtx.contains(key);
     }
 
     /**
-     * Removes the value and any listeners for the given key.
+     * {@inheritDoc}
      * 
-     * @param key the key
-     * @return the removed value, or null if absent
+     * Delegates to the default context instance.
      */
+    @Override
     public Object remove(Key<?> key) {
-        keyTypes.remove(key.name());
-        var removed = values.remove(key);
-        listeners.remove(key);
-        return removed;
+        return defaultCtx.remove(key);
     }
 
     /**
-     * Clears all keys and listeners from the context.
+     * {@inheritDoc}
+     * 
+     * Delegates to the default context instance.
      */
+    @Override
     public void clear() {
-        values.clear();
-        keyTypes.clear();
-        listeners.clear();
+        defaultCtx.clear();
     }
 
     /**
-     * Registers a listener to be notified whenever the value for the key changes.
-     * The listener is weakly referenced to avoid preventing its garbage collection.
+     * {@inheritDoc}
      * 
-     * @param key      the key
-     * @param listener the listener
-     * @param <T>      the type
+     * Delegates to the default context instance.
      */
+    @Override
     public <T> void addListener(Key<T> key, Listener<T> listener) {
-        listeners.computeIfAbsent(key, k -> new CopyOnWriteArrayList<>()).add(new WeakReference<>(listener));
+        defaultCtx.addListener(key, listener);
     }
 
     /**
-     * Unregisters a previously registered listener for the key.
+     * {@inheritDoc}
      * 
-     * @param key      the key
-     * @param listener the listener to remove
-     * @param <T>      the type
+     * Delegates to the default context instance.
      */
+    @Override
     public <T> void removeListener(Key<T> key, Listener<T> listener) {
-        var list = listeners.get(key);
-        if (list != null) {
-            list.removeIf(ref -> {
-                var l = ref.get();
-                return l == null || l.equals(listener);
-            });
-            if (list.isEmpty()) {
-                listeners.remove(key);
-            }
-        }
+        defaultCtx.removeListener(key, listener);
     }
 }

src/main/java/conflux/CtxInstance.java

@@ -0,0 +1,207 @@
+/**
+ * Copyright (C) 2025, Leo Galambos
+ * All rights reserved.
+ * 
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ * 
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * 3. All advertising materials mentioning features or use of this software must
+ *    display the following acknowledgement:
+ *    This product includes software developed by the Egothor project.
+ *
+ * 4. Neither the name of the copyright holder nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+package conflux;
+
+import java.lang.ref.WeakReference;
+import java.util.List;
+import java.util.Map;
+import java.util.Objects;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.CopyOnWriteArrayList;
+
+/**
+ * A globally accessible, type-safe context for sharing data between independent
+ * parts of an application. Supports listeners that are notified whenever a
+ * registered key's value changes.
+ *
+ * This implementation guarantees:
+ * <ul>
+ * <li>Strongly typed keys using {@link Key}</li>
+ * <li>One consistent type per key name</li>
+ * <li>Support for weak-referenced listeners to avoid memory leaks</li>
+ * <li>Thread-safe operations</li>
+ * </ul>
+ *
+ * @author Leo Galambos
+ */
+public final class CtxInstance implements CtxInterface {
+
+    private final Map<Key<?>, Object> values = new ConcurrentHashMap<>();
+    private final Map<String, Class<?>> keyTypes = new ConcurrentHashMap<>();
+    private final Map<Key<?>, List<WeakReference<Listener<?>>>> listeners = new ConcurrentHashMap<>();
+
+    /**
+     * Protected no-argument constructor added to satisfy code analysis tools.
+     * <p>
+     * This constructor should not be used directly. It exists solely to comply with
+     * static analysis requirements (e.g., PMD) expecting at least one constructor.
+     */
+    protected CtxInstance() {
+        // Intentionally left blank
+    }
+
+    /**
+     * Stores or updates the value for a given key. If the key is used for the first
+     * time, its type is recorded. If the key has been used before with a different
+     * type, an exception will be thrown.
+     *
+     * After setting the value, any registered listeners for that key will be
+     * notified (if the value was modified).
+     *
+     * @param key   the key
+     * @param value the value to store
+     * @param <T>   the type of the value
+     * @throws IllegalStateException if the key is reused with a different type
+     */
+    @Override
+    public <T> void put(Key<T> key, T value) {
+        keyTypes.compute(key.name(), (k, existingType) -> {
+            if (existingType == null) {
+                return key.type();
+            } else {
+                if (!existingType.equals(key.type())) {
+                    throw new IllegalStateException(
+                            "Key '" + key.name() + "' already associated with type " + existingType.getName());
+                }
+                return existingType;
+            }
+        });
+
+        @SuppressWarnings("unchecked")
+        T previous = (T) values.put(key, value);
+
+        if (Objects.deepEquals(value, previous)) {
+            // no change
+            return;
+        }
+
+        // notify listeners
+        List<WeakReference<Listener<?>>> list = listeners.get(key);
+        if (list != null) {
+            for (WeakReference<Listener<?>> ref : list) {
+                Listener<?> listener = ref.get();
+                if (listener != null) {
+                    @SuppressWarnings("unchecked")
+                    Listener<T> typedListener = (Listener<T>) listener;
+                    typedListener.valueChanged(value);
+                }
+            }
+            // clean up dead weak references
+            list.removeIf(ref -> ref.get() == null);
+        }
+    }
+
+    /**
+     * Retrieves the value for the given key, or {@code null} if not set.
+     *
+     * @param key the key
+     * @param <T> the type
+     * @return the stored value or null
+     */
+    @Override
+    @SuppressWarnings("unchecked")
+    public <T> T get(Key<T> key) {
+        return (T) values.get(key);
+    }
+
+    /**
+     * Checks if a value exists for the given key.
+     *
+     * @param key the key
+     * @return true if a value is present
+     */
+    @Override
+    public boolean contains(Key<?> key) {
+        return values.containsKey(key);
+    }
+
+    /**
+     * Removes the value and any listeners for the given key.
+     *
+     * @param key the key
+     * @return the removed value, or null if absent
+     */
+    @Override
+    public Object remove(Key<?> key) {
+        keyTypes.remove(key.name());
+        Object removed = values.remove(key);
+        listeners.remove(key);
+        return removed;
+    }
+
+    /**
+     * Clears all keys and listeners from the context.
+     */
+    @Override
+    public void clear() {
+        values.clear();
+        keyTypes.clear();
+        listeners.clear();
+    }
+
+    /**
+     * Registers a listener to be notified whenever the value for the key changes.
+     * The listener is weakly referenced to avoid preventing its garbage collection.
+     *
+     * @param key      the key
+     * @param listener the listener
+     * @param <T>      the type
+     */
+    @Override
+    public <T> void addListener(Key<T> key, Listener<T> listener) {
+        listeners.computeIfAbsent(key, k -> new CopyOnWriteArrayList<>()).add(new WeakReference<>(listener));
+    }
+
+    /**
+     * Unregisters a previously registered listener for the key.
+     *
+     * @param key      the key
+     * @param listener the listener to remove
+     * @param <T>      the type
+     */
+    @Override
+    public <T> void removeListener(Key<T> key, Listener<T> listener) {
+        List<WeakReference<Listener<?>>> list = listeners.get(key);
+        if (list != null) {
+            list.removeIf(ref -> {
+                Listener<?> l = ref.get();
+                return l == null || l.equals(listener);
+            });
+            if (list.isEmpty()) {
+                listeners.remove(key);
+            }
+        }
+    }
+}

src/main/java/conflux/CtxInterface.java

@@ -0,0 +1,121 @@
+/**
+ * Copyright (C) 2025, Leo Galambos
+ * All rights reserved.
+ * 
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ * 
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * 3. All advertising materials mentioning features or use of this software must
+ *    display the following acknowledgement:
+ *    This product includes software developed by the Egothor project.
+ *
+ * 4. Neither the name of the copyright holder nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+package conflux;
+
+/**
+ * A type-safe, thread-safe context interface for storing and retrieving
+ * key-value pairs.
+ *
+ * Implementations of this interface support:
+ * <ul>
+ * <li>Recording type-safe associations between keys and values</li>
+ * <li>Automatic listener notification when a value changes</li>
+ * <li>Context isolation (e.g., per name or use case)</li>
+ * </ul>
+ *
+ * This interface is sealed to only permit known, safe implementations.
+ *
+ * @see Key
+ * @see Listener
+ * 
+ * @author Leo Galambos
+ */
+public sealed interface CtxInterface permits Ctx, CtxInstance {
+
+    /**
+     * Stores or updates the value for a given key. If the key is used for the first
+     * time, its type is recorded. If the key has been used before with a different
+     * type, an exception will be thrown.
+     *
+     * After setting the value, any registered listeners for that key will be
+     * notified (if the value was modified).
+     *
+     * @param key   the key
+     * @param value the value to store
+     * @param <T>   the type of the value
+     * @throws IllegalStateException if the key is reused with a different type
+     */
+    <T> void put(Key<T> key, T value);
+
+    /**
+     * Retrieves the value for the given key, or {@code null} if not set.
+     *
+     * @param key the key
+     * @param <T> the type
+     * @return the stored value or null
+     */
+    <T> T get(Key<T> key);
+
+    /**
+     * Checks if a value exists for the given key.
+     *
+     * @param key the key
+     * @return true if a value is present
+     */
+    boolean contains(Key<?> key);
+
+    /**
+     * Removes the value and any listeners for the given key.
+     *
+     * @param key the key
+     * @return the removed value, or null if absent
+     */
+    Object remove(Key<?> key);
+
+    /**
+     * Clears all keys and listeners from the context.
+     */
+    void clear();
+
+    /**
+     * Registers a listener to be notified whenever the value for the key changes.
+     * The listener is weakly referenced to avoid preventing its garbage collection.
+     *
+     * @param key      the key
+     * @param listener the listener
+     * @param <T>      the type
+     */
+    <T> void addListener(Key<T> key, Listener<T> listener);
+
+    /**
+     * Unregisters a previously registered listener for the key.
+     *
+     * @param key      the key
+     * @param listener the listener to remove
+     * @param <T>      the type
+     */
+    <T> void removeListener(Key<T> key, Listener<T> listener);
+
+}

src/main/java/conflux/Key.java

@@ -42,19 +42,19 @@ package conflux;
  * @author Leo Galambos
  */
 public final class Key<T> { // NOPMD by Leo Galambos on 7/3/25, 10:29 PM
-    private final String name;
-    private final Class<T> type;
+    private final String nameField;
+    private final Class<T> typeField;
 
     private Key(String name, Class<T> type) {
-        this.name = name;
-        this.type = type;
+        this.nameField = name;
+        this.typeField = type;
     }
 
     /**
      * Creates a new typed key.
      *
-     * @param name a unique key name
-     * @param type the class of the key's value type
+     * @param name a unique key nameField
+     * @param type the class of the key's value typeField
      * @param <T>  the type
      * @return a new {@code Key}
      */
@@ -68,7 +68,7 @@ public final class Key<T> { // NOPMD by Leo Galambos on 7/3/25, 10:29 PM
      * @return the name
      */
     public String name() {
-        return name;
+        return nameField;
     }
 
     /**
@@ -77,21 +77,21 @@ public final class Key<T> { // NOPMD by Leo Galambos on 7/3/25, 10:29 PM
      * @return the type
      */
     public Class<T> type() {
-        return type;
+        return typeField;
     }
 
     @Override
     public int hashCode() {
-        return name.hashCode();
+        return nameField.hashCode();
     }
 
     @Override
     public boolean equals(Object obj) {
-        return obj instanceof Key<?> other && name.equals(other.name);
+        return obj instanceof Key<?> other && nameField.equals(other.nameField);
     }
 
     @Override
     public String toString() {
-        return "Key[" + name + ", " + type.getSimpleName() + "]";
+        return "Key[" + nameField + ", " + typeField.getSimpleName() + "]";
     }
 }

src/main/java/conflux/package-info.java

@@ -1,28 +1,33 @@
 /**
  * Provides a lightweight, type-safe, application-wide context mechanism for
  * sharing strongly typed data among otherwise decoupled classes.
- * <p>
- * The {@link conflux.Ctx} class acts as a central, generic context storage
- * supporting key-based put/get operations. Each {@link conflux.Key} defines a
- * unique, strongly typed entry in the context, ensuring type consistency and
- * preventing misuse. {@link conflux.Listener} interfaces allow clients to
- * observe value changes for specific keys. Listeners are held with weak
- * references to avoid memory leaks.
- * <p>
- * Typical usage involves defining {@link conflux.Key} instances with explicit
- * types, storing values through {@code Ctx.INSTANCE.put()}, and retrieving them
- * with {@code Ctx.INSTANCE.get()}. Listeners can be attached via
- * {@code Ctx.INSTANCE.addListener()} to react to context changes in a decoupled
- * and thread-safe manner. Values and listeners can be removed individually or
- * the entire context can be cleared.
- * <p>
- * <b>Best Practices:</b>
+ *
+ * The {@link conflux.Ctx} enum serves as a central, generic context storage,
+ * supporting key-based put/get operations. Each {@link conflux.Key} instance
+ * defines a unique, strongly typed entry in the context, ensuring type
+ * consistency and preventing misuse.
+ *
+ * The {@link conflux.Listener} interface allows clients to observe value
+ * changes for specific keys. Listeners are weakly referenced to prevent memory
+ * leaks.
+ *
+ * Typical usage:
+ * <ul>
+ * <li>Define {@link conflux.Key} instances with explicit types</li>
+ * <li>Store values via {@code Ctx.INSTANCE.put(key, value)}</li>
+ * <li>Retrieve values via {@code Ctx.INSTANCE.get(key)}</li>
+ * <li>Register listeners with {@code Ctx.INSTANCE.addListener()}</li>
+ * </ul>
+ *
+ * Values and listeners can be removed individually, or the entire context can
+ * be cleared.
+ *
+ * Best practices:
  * <ul>
  * <li>Define keys as constants to maintain consistency and avoid
- * collisions.</li>
- * <li>Remove listeners when no longer needed (although weak references help
- * prevent leaks).</li>
- * <li>Use unique key names to ensure no accidental type conflicts.</li>
+ * collisions</li>
+ * <li>Remove listeners when no longer needed</li>
+ * <li>Use unique key names to avoid accidental type conflicts</li>
  * </ul>
  *
  * @see conflux.Ctx

src/test/java/conflux/CtxTest.java

@@ -36,6 +36,7 @@ package conflux;
 
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertNull;
 import static org.junit.jupiter.api.Assertions.assertThrows;
 import static org.junit.jupiter.api.Assertions.assertTrue;
 
@@ -159,4 +160,50 @@ public class CtxTest {
         assertTrue(flag[0] || !flag[0]);
         System.out.println("...ok");
     }
+
+    @Test
+    void testMultipleContextsIsolation() {
+        System.out.println("testMultipleContextsIsolation");
+        var ctxA = Ctx.INSTANCE.getContext("A");
+        var ctxB = Ctx.INSTANCE.getContext("B");
+
+        ctxA.put(intKey, 10);
+        ctxB.put(intKey, 20);
+
+        assertEquals(10, ctxA.get(intKey));
+        assertEquals(20, ctxB.get(intKey));
+        assertNull(Ctx.INSTANCE.get(intKey)); // Default context is separate
+
+        ctxA.clear();
+        assertFalse(ctxA.contains(intKey));
+        assertEquals(20, ctxB.get(intKey));
+
+        System.out.println("...ok");
+    }
+
+    @Test
+    void testListenerNotificationInSeparateContexts() {
+        System.out.println("testListenerNotificationInSeparateContexts");
+        var ctxA = Ctx.INSTANCE.getContext("A");
+        var ctxB = Ctx.INSTANCE.getContext("B");
+
+        var resultA = new StringBuilder();
+        var resultB = new StringBuilder();
+
+        Listener<Integer> listenerA = v -> resultA.append(v);
+        Listener<Integer> listenerB = v -> resultB.append(v);
+
+        ctxA.addListener(intKey, listenerA);
+        ctxB.addListener(intKey, listenerB);
+
+        ctxA.put(intKey, 1);
+        ctxB.put(intKey, 2);
+        ctxA.put(intKey, 3);
+        ctxB.put(intKey, 4);
+
+        assertEquals("13", resultA.toString());
+        assertEquals("24", resultB.toString());
+
+        System.out.println("...ok");
+    }
 }