docs/_docs/code-snippets/java/src/main/java/org/apache/ignite/snippets/plugin/MyPlugin.java

/*
 * 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.
 */
package org.apache.ignite.snippets.plugin;

import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;

import org.apache.ignite.IgniteCache;
import org.apache.ignite.plugin.IgnitePlugin;
import org.apache.ignite.plugin.PluginContext;

/**
 * 
 * The plugin prints cache size information to console  
 *
 */
public class MyPlugin implements IgnitePlugin, Runnable {

    private final ScheduledExecutorService scheduler = Executors.newScheduledThreadPool(1);

    private PluginContext context;

    private long interval;

    /**
     * 
     * @param context 
     */
    public MyPlugin(long interval, PluginContext context) {
        this.interval = interval;
        this.context = context;
    }

    private void print0() {
        StringBuilder sb = new StringBuilder("\nCache Information: \n");

        //get the names of all caches
        context.grid().cacheNames().forEach(cacheName -> {
            //get the specific cache
            IgniteCache cache = context.grid().cache(cacheName);
            if (cache != null) {
                sb.append("  cacheName=").append(cacheName).append(", size=").append(cache.size())
                        .append("\n");
            }
        });

        System.out.print(sb.toString());
    }

    /**
     * Prints the information about caches to console.
     */
    public void printCacheInfo() {
        print0();
    }

    @Override
    public void run() {
        print0();
    }

    void start() {
        scheduler.scheduleAtFixedRate(this, interval, interval, TimeUnit.SECONDS);
    }

    void stop() {
        scheduler.shutdownNow();
    }
}