[KARAF-6017] - added cache service

cache/api/pom.xml

@@ -0,0 +1,55 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <!--
+
+    Licensed to the Apache Software Foundation (ASF) under one or more
+    contributor license agreements.  See the NOTICE file distributed with
+    this work for additional information regarding copyright ownership.
+    The ASF licenses this file to You under the Apache License, Version 2.0
+    (the "License"); you may not use this file except in compliance with
+    the License.  You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+-->
+
+    <parent>
+        <artifactId>cache</artifactId>
+        <groupId>org.apache.karaf.cache</groupId>
+        <version>4.4.2-SNAPSHOT</version>
+        <relativePath>../pom.xml</relativePath>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>api</artifactId>
+
+    <packaging>bundle</packaging>
+
+    <dependencies>
+        <dependency>
+            <groupId>javax.cache</groupId>
+            <artifactId>cache-api</artifactId>
+            <version>1.1.0</version>
+        </dependency>
+    </dependencies>
+
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.felix</groupId>
+                <artifactId>maven-bundle-plugin</artifactId>
+                <extensions>true</extensions>
+                <configuration>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+</project>

cache/api/src/main/java/org/apache/karaf/cache/api/CacheService.java

@@ -0,0 +1,17 @@
+package org.apache.karaf.cache.api;
+
+import javax.cache.configuration.Configuration;
+import java.util.List;
+
+public interface CacheService {
+
+    <K, V> void createCache(String name, Configuration<K, V> configuration);
+
+    <K, V> V get(String name, K key);
+
+    <K, V> void put(String name, K key, V value);
+
+    void invalidateCache(String name);
+
+    List<String> listCaches();
+}

cache/commands/pom.xml

@@ -0,0 +1,65 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+
+    <!--
+
+Licensed to the Apache Software Foundation (ASF) under one or more
+contributor license agreements.  See the NOTICE file distributed with
+this work for additional information regarding copyright ownership.
+The ASF licenses this file to You under the Apache License, Version 2.0
+(the "License"); you may not use this file except in compliance with
+the License.  You may obtain a copy of the License at
+
+   http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+-->
+    <parent>
+        <artifactId>cache</artifactId>
+        <groupId>org.apache.karaf.cache</groupId>
+        <version>4.4.2-SNAPSHOT</version>
+        <relativePath>../pom.xml</relativePath>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>commands</artifactId>
+
+    <packaging>bundle</packaging>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.apache.karaf.shell</groupId>
+            <artifactId>org.apache.karaf.shell.core</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.karaf.cache</groupId>
+            <artifactId>api</artifactId>
+            <version>${project.version}</version>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.karaf.tooling</groupId>
+                <artifactId>karaf-services-maven-plugin</artifactId>
+            </plugin>
+            <plugin>
+                <groupId>org.apache.felix</groupId>
+                <artifactId>maven-bundle-plugin</artifactId>
+                <extensions>true</extensions>
+                <configuration>
+                    <instructions>
+                        <Karaf-Commands>*</Karaf-Commands>
+                    </instructions>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+</project>

cache/commands/src/main/java/org/apache/karaf/cache/core/commands/Create.java

@@ -0,0 +1,39 @@
+package org.apache.karaf.cache.core.commands;
+
+import org.apache.karaf.cache.api.CacheService;
+import org.apache.karaf.shell.api.action.Action;
+import org.apache.karaf.shell.api.action.Argument;
+import org.apache.karaf.shell.api.action.Command;
+import org.apache.karaf.shell.api.action.lifecycle.Reference;
+import org.apache.karaf.shell.api.action.lifecycle.Service;
+
+import javax.cache.configuration.Configuration;
+import javax.cache.configuration.MutableConfiguration;
+import javax.cache.expiry.CreatedExpiryPolicy;
+import javax.cache.expiry.Duration;
+
+@Service
+@Command(scope = "cache", name = "create", description = "")
+public class Create implements Action {
+
+    @Argument(index = 0, required = true)
+    String cacheName;
+    @Argument(index = 1, required = true)
+    String keyType;
+    @Argument(index = 2, required = true)
+    String valueType;
+    @Reference
+    private CacheService cacheService;
+
+    @Override
+    public Object execute() throws Exception {
+        Class keyClass = Class.forName(keyType);
+        Class valueClass = Class.forName(valueType);
+        Configuration<?, ?> configuration = new MutableConfiguration<>()
+                .setTypes(keyClass, valueClass)
+                .setStoreByValue(false)
+                .setExpiryPolicyFactory(CreatedExpiryPolicy.factoryOf(Duration.ONE_MINUTE));
+        cacheService.createCache(cacheName, configuration);
+        return null;
+    }
+}

cache/commands/src/main/java/org/apache/karaf/cache/core/commands/Get.java

@@ -0,0 +1,30 @@
+package org.apache.karaf.cache.core.commands;
+
+import org.apache.karaf.cache.api.CacheService;
+import org.apache.karaf.cache.core.commands.completers.CacheNameCompleter;
+import org.apache.karaf.shell.api.action.Action;
+import org.apache.karaf.shell.api.action.Argument;
+import org.apache.karaf.shell.api.action.Command;
+import org.apache.karaf.shell.api.action.Completion;
+import org.apache.karaf.shell.api.action.lifecycle.Reference;
+import org.apache.karaf.shell.api.action.lifecycle.Service;
+
+@Service
+@Command(scope = "cache", name = "get", description = "")
+public class Get implements Action {
+
+    @Reference
+    CacheService cacheService;
+
+    @Argument(index = 0, required = true)
+    @Completion(CacheNameCompleter.class)
+    String cacheName;
+
+    @Argument(index = 1, required = true)
+    Object key;
+
+    @Override
+    public Object execute() throws Exception {
+        return cacheService.get(cacheName, key);
+    }
+}

cache/commands/src/main/java/org/apache/karaf/cache/core/commands/Invalidate.java

@@ -0,0 +1,28 @@
+package org.apache.karaf.cache.core.commands;
+
+import org.apache.karaf.cache.api.CacheService;
+import org.apache.karaf.cache.core.commands.completers.CacheNameCompleter;
+import org.apache.karaf.shell.api.action.Action;
+import org.apache.karaf.shell.api.action.Argument;
+import org.apache.karaf.shell.api.action.Command;
+import org.apache.karaf.shell.api.action.Completion;
+import org.apache.karaf.shell.api.action.lifecycle.Reference;
+import org.apache.karaf.shell.api.action.lifecycle.Service;
+
+@Service
+@Command(scope = "cache", name = "invalidate", description = "")
+public class Invalidate implements Action {
+
+    @Reference
+    CacheService cacheService;
+
+    @Argument(index = 0, required = true)
+    @Completion(CacheNameCompleter.class)
+    String cacheName;
+
+    @Override
+    public Object execute() throws Exception {
+        cacheService.invalidateCache(cacheName);
+        return cacheService + " invalidated";
+    }
+}

cache/commands/src/main/java/org/apache/karaf/cache/core/commands/ListCaches.java

@@ -0,0 +1,20 @@
+package org.apache.karaf.cache.core.commands;
+
+import org.apache.karaf.cache.api.CacheService;
+import org.apache.karaf.shell.api.action.Action;
+import org.apache.karaf.shell.api.action.Command;
+import org.apache.karaf.shell.api.action.lifecycle.Reference;
+import org.apache.karaf.shell.api.action.lifecycle.Service;
+
+@Service
+@Command(scope = "cache", name = "list", description = "")
+public class ListCaches implements Action {
+
+    @Reference
+    CacheService cacheService;
+
+    @Override
+    public Object execute() throws Exception {
+        return cacheService.listCaches();
+    }
+}

cache/commands/src/main/java/org/apache/karaf/cache/core/commands/Put.java

@@ -0,0 +1,34 @@
+package org.apache.karaf.cache.core.commands;
+
+import org.apache.karaf.cache.api.CacheService;
+import org.apache.karaf.cache.core.commands.completers.CacheNameCompleter;
+import org.apache.karaf.shell.api.action.Action;
+import org.apache.karaf.shell.api.action.Argument;
+import org.apache.karaf.shell.api.action.Command;
+import org.apache.karaf.shell.api.action.Completion;
+import org.apache.karaf.shell.api.action.lifecycle.Reference;
+import org.apache.karaf.shell.api.action.lifecycle.Service;
+
+@Service
+@Command(scope = "cache", name = "put", description = "")
+public class Put implements Action {
+
+    @Reference
+    private CacheService cacheService;
+
+    @Argument(index = 0, required = true)
+    @Completion(CacheNameCompleter.class)
+    String cacheName;
+
+    @Argument(index = 1, required = true)
+    Object key;
+
+    @Argument(index = 2, required = true)
+    Object value;
+
+    @Override
+    public Object execute() throws Exception {
+        cacheService.put(cacheName, key, value);
+        return null;
+    }
+}

cache/commands/src/main/java/org/apache/karaf/cache/core/commands/completers/CacheNameCompleter.java

@@ -0,0 +1,32 @@
+package org.apache.karaf.cache.core.commands.completers;
+
+import org.apache.karaf.cache.api.CacheService;
+import org.apache.karaf.shell.api.action.lifecycle.Reference;
+import org.apache.karaf.shell.api.action.lifecycle.Service;
+import org.apache.karaf.shell.api.console.CommandLine;
+import org.apache.karaf.shell.api.console.Completer;
+import org.apache.karaf.shell.api.console.Session;
+import org.apache.karaf.shell.support.completers.StringsCompleter;
+
+import java.util.List;
+
+@Service
+public class CacheNameCompleter implements Completer {
+
+    @Reference
+    CacheService cacheService;
+
+    @Override
+    public int complete(Session session, CommandLine commandLine, List<String> candidates) {
+        StringsCompleter delegate = new StringsCompleter();
+        try {
+            for (String cache : cacheService.listCaches()) {
+                delegate.getStrings().add(cache);
+            }
+        } catch (Exception e) {
+            // nothing to do
+        }
+
+        return delegate.complete(session, commandLine, candidates);
+    }
+}