import com.google.common.cache.Cache;

import com.google.common.cache.CacheBuilder;

import com.google.common.cache.CacheLoader;

import com.google.common.cache.LoadingCache;

import java.util.concurrent.Callable;

import java.util.concurrent.ExecutionException;

/**

* @author 李文浩

* @date 2018/12/28

*/

public class Demo {

/**

* CacheLoader

*/

public void loadingCache() {

LoadingCache<String, String> graphs = CacheBuilder.newBuilder()

.maximumSize(1000).build(new CacheLoader<String, String>() {

@Override

public String load(String key) throws Exception {

System.out.println("key:" + key);

if ("key".equals(key)) {

return "key return result";

} else {

return "get-if-absent-compute";

}

}

});

String resultVal = null;

try {

resultVal = graphs.get("key");

} catch (ExecutionException e) {

e.printStackTrace();

}

System.out.println(resultVal);

}

/**

* Callable

*/

public void callablex() throws ExecutionException {

Cache<String, String> cache = CacheBuilder.newBuilder()

.maximumSize(1000).build();

String result = cache.get("key", new Callable<String>() {

public String call() {

return "result";

}

});

System.out.println(result);

}

}