Using Java to manipulate Coherence
To use Java to operate Coherence, you need to follow the following steps:
Step 1: Add Maven dependency
You can access Coherence by adding the following Maven dependencies:
<dependency>
<groupId>com.oracle.coherence</groupId>
<artifactId>coherence</artifactId>
<version>...</version>
</dependency>
Please ensure to replace '<version>' with the Coherence version number you want to use.
Step 2: Create Coherence cluster configuration file
Before using Coherence in Java code, you need to configure the Coherence cluster. Create a 'coherence cache configuration. xml' file and define your cache configuration in it. Here is a basic example:
<?xml version="1.0"?>
<!-- Coherence configuration file -->
<coherence xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.oracle.com/coherence/coherence-operational-config
\t\t\t\t http://xmlns.oracle.com/coherence/coherence-operational-config/1.0/coherence-operational-config.xsd">
<!-- Cache configuration -->
<caching-scheme-mapping>
<cache-mapping>
<cache-name>myCache</cache-name>
<scheme-name>local</scheme-name>
</cache-mapping>
</caching-scheme-mapping>
<caching-schemes>
<local-scheme>
<scheme-name>local</scheme-name>
</local-scheme>
</caching-schemes>
</coherence>
In this example, we defined a cache called 'myCache'.
Step 3: Create a data access class
Create a Java class responsible for connecting and executing Coherence related operations. Here is an example:
import com.tangosol.net.CacheFactory;
import com.tangosol.net.NamedCache;
public class CoherenceExample {
private static final String CACHE_NAME = "myCache";
private static NamedCache myCache;
public static void main(String[] args) {
CacheFactory. ensueCluster()// Connect to Coherence cluster
MyCache=CacheFactory. getCache (CACHE-NAME)// Get cache with specified name
//Insert Data
myCache.put("key1", "value1");
myCache.put("key2", "value2");
//Modify data
myCache.put("key1", "updatedValue1");
//Query data
System.out.println(myCache.get("key1"));
//Delete data
myCache.remove("key1");
CacheFactory. shutdown()// Close Coherence cluster connection
}
}
In this example, we first connect to the Coherence cluster through 'CacheFactory. ensueCluster()', and then obtain a cache named 'myCache'. Next, we use the 'put()' method to insert data, the 'get()' method to obtain data, the 'put()' method to modify data, and the 'remove()' method to delete data. Finally, we use 'CacheFactory. shutdown()' to close the Coherence cluster connection.
Please ensure that the name of 'myCache' matches the one you defined in step 2.
You can compile and run this Java code to implement Coherence's data insertion, modification, query, and deletion operations.
