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| package com.bigdata.flink;
import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.google.common.cache.Cache;
import com.google.common.cache.CacheBuilder;
import com.google.common.cache.RemovalListener;
import com.google.common.cache.RemovalNotification;
import org.apache.flink.api.java.tuple.Tuple4;
import org.apache.flink.api.java.tuple.Tuple5;
import org.apache.flink.configuration.Configuration;
import org.apache.flink.streaming.api.functions.async.ResultFuture;
import org.apache.flink.streaming.api.functions.async.RichAsyncFunction;
import org.apache.http.HttpHost;
import org.apache.http.auth.AuthScope;
import org.apache.http.auth.UsernamePasswordCredentials;
import org.apache.http.client.CredentialsProvider;
import org.apache.http.impl.client.BasicCredentialsProvider;
import org.elasticsearch.action.ActionListener;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RestClient;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import java.util.Collections;
import java.util.concurrent.TimeUnit;
public class ElasticsearchAsyncFunction extends RichAsyncFunction<Tuple4<String, String, String, Integer>, Tuple5<String, String, String, Integer,Integer>> {
private String host;
private Integer port;
private String user;
private String password;
private String index;
private String type;
public ElasticsearchAsyncFunction(String host, Integer port, String user, String password, String index, String type) {
this.host = host;
this.port = port;
this.user = user;
this.password = password;
this.index = index;
this.type = type;
}
private RestHighLevelClient restHighLevelClient;
private Cache<String,Integer> cache;
@Override
public void open(Configuration parameters){
CredentialsProvider credentialsProvider = new BasicCredentialsProvider();
credentialsProvider.setCredentials(AuthScope.ANY, new UsernamePasswordCredentials(user, password));
restHighLevelClient = new RestHighLevelClient(
RestClient
.builder(new HttpHost(host, port))
.setHttpClientConfigCallback(httpAsyncClientBuilder -> httpAsyncClientBuilder.setDefaultCredentialsProvider(credentialsProvider)));
cache=CacheBuilder.newBuilder().maximumSize(2).expireAfterAccess(5, TimeUnit.MINUTES).build();
}
@Override
public void close() throws Exception {
restHighLevelClient.close();
}
@Override
public void asyncInvoke(Tuple4<String, String, String, Integer> input, ResultFuture<Tuple5<String, String, String, Integer, Integer>> resultFuture) {
Integer cachedValue = cache.getIfPresent(input.f0);
if(cachedValue !=null){
System.out.println("从缓存中获取到维度数据: key="+input.f0+",value="+cachedValue);
resultFuture.complete(Collections.singleton(new Tuple5<>(input.f0,input.f1,input.f2,input.f3,cachedValue)));
}else {
searchFromES(input,resultFuture);
}
}
private void searchFromES(Tuple4<String, String, String, Integer> input, ResultFuture<Tuple5<String, String, String, Integer, Integer>> resultFuture){
Tuple5<String, String, String, Integer, Integer> output = new Tuple5<>();
output.f0=input.f0;
output.f1=input.f1;
output.f2=input.f2;
output.f3=input.f3;
String dimKey = input.f0;
SearchRequest searchRequest = new SearchRequest();
searchRequest.indices(index);
searchRequest.types(type);
searchRequest.source(SearchSourceBuilder.searchSource().query(QueryBuilders.idsQuery().addIds(dimKey)));
restHighLevelClient.searchAsync(searchRequest, new ActionListener<SearchResponse>() {
@Override
public void onResponse(SearchResponse searchResponse) {
SearchHit[] searchHits = searchResponse.getHits().getHits();
if(searchHits.length >0 ){
JSONObject obj = JSON.parseObject(searchHits[0].getSourceAsString());
Integer dimValue=obj.getInteger("age");
output.f4=dimValue;
cache.put(dimKey,dimValue);
System.out.println("将维度数据放入缓存: key="+dimKey+",value="+dimValue);
}
resultFuture.complete(Collections.singleton(output));
}
@Override
public void onFailure(Exception e) {
output.f4=null;
resultFuture.complete(Collections.singleton(output));
}
});
}
@Override
public void timeout(Tuple4<String, String, String, Integer> input, ResultFuture<Tuple5<String, String, String, Integer, Integer>> resultFuture) {
searchFromES(input,resultFuture);
}
}
|
