Ehcacheこんにちは世界の例
このチュートリアルでは、http://ehcache.org/[Ehcache]を使い始めるための2つの例を紹介します。
使用されるツール:
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Ehcache 2.9
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Maven 3
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Gradle 2
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JDK 1.7
P.S EhcacheにはJDK 1.5以上が必要です.
1.プロジェクトのディレクトリ構造
2. Hello World
これがMavenプロジェクトであると仮定します:
pom.xml
<dependency> <groupId>net.sf.ehcache</groupId> <artifactId>ehcache</artifactId> <version>2.9.0</version> </dependency>
コメントは読んでください。
HelloEhCache.java
package com.mkyong.cache; import net.sf.ehcache.Cache; import net.sf.ehcache.CacheManager; import net.sf.ehcache.Element; public class HelloEhCache{ public static void main(String[]args) { //1. Create a cache manager CacheManager cm = CacheManager.getInstance(); //2. Create a cache called "cache1" cm.addCache("cache1"); //3. Get a cache called "cache1" Cache cache = cm.getCache("cache1"); //4. Put few elements in cache cache.put(new Element("1","Jan")); cache.put(new Element("2","Feb")); cache.put(new Element("3","Mar")); //5. Get element from cache Element ele = cache.get("1"); //6. Print out the element String output = (ele == null ? null : ele.getObjectValue().toString()); System.out.println(output); //7. Is key in cache? System.out.println(cache.isKeyInCache("1")); System.out.println(cache.isKeyInCache("5")); //8. shut down the cache manager cm.shutdown(); } }
出力
06:03:37.007[main]WARN n.s.e.config.ConfigurationFactory - No configuration found. Configuring ehcache from ehcache-failsafe.xml found in the classpath: //... Jan true false //...
2. Ehcache設定
この例では、ehcache.xmlファイルを使ってEhcacheを設定する方法を説明します。
これがGradleプロジェクトであると仮定します。
gradle.build
apply plugin: 'java' apply plugin: 'eclipse-wtp' version = '1.0' //Uses JDK 7 sourceCompatibility = 1.7 targetCompatibility = 1.7 //Get dependencies from Maven central repository repositories { mavenCentral() } //Project dependencies dependencies { compile 'net.sf.ehcache:ehcache:2.9.0' }
ehcache.xml`を作成し、
src/main/resources`フォルダに入れます。
src/main/resources/ehcache.xml
<ehcache xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="ehcache.xsd" updateCheck="true" monitoring="autodetect" dynamicConfig="true"> <!-- By default, Ehcache stored the cached files in temp folder. --> <!-- <diskStore path="java.io.tmpdir"/> --> <!-- Ask Ehcache to store cache in this path --> <diskStore path="c:\\cache"/> <!-- Sample cache named cache1 This cache contains a maximum in memory of 10000 elements, and will expire an element if it is idle for more than 5 minutes and lives for more than 10 minutes. If there are more than 10000 elements it will overflow to the disk cache, which in this configuration will go to wherever java.io.tmp is defined on your system. On a standard Linux system this will be/tmp" --> <cache name="cache1" maxEntriesLocalHeap="10000" maxEntriesLocalDisk="1000" eternal="false" diskSpoolBufferSizeMB="20" timeToIdleSeconds="300" timeToLiveSeconds="600" memoryStoreEvictionPolicy="LFU" transactionalMode="off"> <persistence strategy="localTempSwap"/> </cache> </ehcache>
詳細は、公式のhttp://ehcache.org/ehcache.xml[ehcache.xml]の例を参照してください。
HelloEhCache.java
package com.mkyong.cache; import net.sf.ehcache.Cache; import net.sf.ehcache.CacheManager; import net.sf.ehcache.Element; public class HelloEhCache{ public static void main(String[]args) { //1. Create a cache manager CacheManager cm = CacheManager.newInstance(); //cm.addCache("cache1"); //2. Get a cache called "cache1", declared in ehcache.xml Cache cache = cm.getCache("cache1"); //3. Put few elements in cache cache.put(new Element("1","Jan")); cache.put(new Element("2","Feb")); cache.put(new Element("3","Mar")); //4. Get element from cache Element ele = cache.get("2"); //5. Print out the element String output = (ele == null ? null : ele.getObjectValue().toString()); System.out.println(output); //6. Is key in cache? System.out.println(cache.isKeyInCache("3")); System.out.println(cache.isKeyInCache("10")); //7. shut down the cache manager cm.shutdown(); } }
出力
06:45:56.294[main]DEBUG n.s.e.config.ConfigurationFactory - Configuring ehcache from ehcache.xml found in the classpath: file:/C:/Users/mkyong/workspace2/JavaCache/target/classes/ehcache.xml//... Feb true false //...
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注** +
http://ehcache.org/generated/2.9.0/html/ehc-all/#page/Ehcache
Documentation
Set%2Fco-codebasics
loading
a__configuration.html%23[Loading a Configuration]の詳細
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