最近在工作中协助研发进行了ES优化，效果还是非常明显的，几乎翻倍。除了通过各种业务接口测试ES性能以外，还可以直接请求ES接口，绕过服务，这样应该数据回更加准确。所以，ES Client学起来。
首先，先准备了一个ES服务，这里就不多赘述了，大家自己在尝试的时候一定主意好ES Server和ES Client的版本要一致。其次，新建项目，添加依赖。
搜一下，能搜到很多的ES学习资料，建议先去看看大厂出品的基础知识了解一下ES功能。然后就可以直接看ES的API了。下面是ES官方的文档地址：https://www.elastic.co/guide/en/elasticsearch/client/java-rest/6.7/java-rest-high-search.html
如果能能查看自己公司项目源码的小伙伴可以多研究研发的代码，能够更好结合业务理解ES API的使用。
这里说一下，很多ES查询功能都是通过HTTP请求完成的，GET请求，body传参，一开始还是比较懵逼的。查了一些资料需要自己实现是个body携带数据的HTTPGET请求，下面是我的实现代码：
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import org.apache.http.client.methods.HttpEntityEnclosingRequestBase
import javax.annotation.concurrent.NotThreadSafe
/**
* HttpGet请求携带body参数
*/
@NotThreadSafe
class HttpGetByBody extends HttpEntityEnclosingRequestBase {
static final String METHOD_NAME = "GET";
/**
* 获取方法（必须重载）
*
* @return
*/
@Override
String getMethod() {
return METHOD_NAME;
}
/**
* PS:不能照抄{@link org.apache.http.client.methods.HttpPost}
* @param uri
*/
HttpGetByBody(final String uri) {
this(new URI(uri))
}
HttpGetByBody(final URI uri) {
super();
setURI(uri);
}
HttpGetByBody() {
super();
}
}
如果使用HTTP接口进行ES操作，需要组合多层级的参数，这个写起来会比较麻烦、可读性也比较差，而且更加容易出错。所以，还是使用ES Client作为操作ES的基础框架。
如果翻看ES Client源码，最终也是通过HttpClient发起HTTP请求的，这中间进行了很多的封装。这里分享一下ES Client的HTTP Client创建代码部分：
private CloseableHttpAsyncClient createHttpClient() {
//default timeouts are all infinite
RequestConfig.Builder requestConfigBuilder = RequestConfig.custom()
.setConnectTimeout(DEFAULT_CONNECT_TIMEOUT_MILLIS)
.setSocketTimeout(DEFAULT_SOCKET_TIMEOUT_MILLIS);
if (requestConfigCallback != null) {
requestConfigBuilder = requestConfigCallback.customizeRequestConfig(requestConfigBuilder);
}
try {
HttpAsyncClientBuilder httpClientBuilder = HttpAsyncClientBuilder.create().setDefaultRequestConfig(requestConfigBuilder.build())
//default settings for connection pooling may be too constraining
.setMaxConnPerRoute(DEFAULT_MAX_CONN_PER_ROUTE).setMaxConnTotal(DEFAULT_MAX_CONN_TOTAL)
.setSSLContext(SSLContext.getDefault())
.setTargetAuthenticationStrategy(new PersistentCredentialsAuthenticationStrategy());
if (httpClientConfigCallback != null) {
httpClientBuilder = httpClientConfigCallback.customizeHttpClient(httpClientBuilder);
}
final HttpAsyncClientBuilder finalBuilder = httpClientBuilder;
return AccessController.doPrivileged(new PrivilegedAction<CloseableHttpAsyncClient>() {
@Override
public CloseableHttpAsyncClient run() {
return finalBuilder.build();
}
});
} catch (NoSuchAlgorithmException e) {
throw new IllegalStateException("could not create the default ssl context", e);
}
}
可以看出ES Client用到了HttpClient的异步Client，我猜是用future实现同步返回响应结果，这个没仔细看，有错请指出。这里也回答我的自己的一个疑惑，ES Client是支持并发的。
就我自己的观察，ES Client的封装程度非常高，完全可以拿来就用。我担心自己过几天之后就不知道改怎么用这些ES Client 的API了，所以又进行了一次封装，权当是一个学习笔记类。
封装代码有点多，放到了文末。
这个可以用来跑一部分数据到ES里。
package com.funtest.groovytest
import com.alibaba.fastjson.JSONObject
import com.funtester.es.ESClient
import com.funtester.frame.SourceCode
import com.funtester.frame.execute.FunQpsConcurrent
import java.util.concurrent.atomic.AtomicInteger
class ESC extends SourceCode {
static void main(String[] args) {
def client = new ESClient("127.0.0.1", 9200, "http")
def data = new JSONObject()
data.name = "FunTester"
data.age = getRandomInt(100)
def index = new AtomicInteger(0)
def test = {
data.put("time", index.getAndIncrement())
client.index("fun", "tt", data)
}
new FunQpsConcurrent(test, "ES添加数据").start()
}
}
如果想测试添加、删除功能，只需要把test闭包内容修改即可。
def test = {
data.put("time", index.getAndIncrement())
client.delete("fun", "tt", client.index("fun", "tt", data))
}
下面是搜索功能的性能测试用例：
package com.funtest.groovytest
import com.alibaba.fastjson.JSONObject
import com.funtester.es.ESClient
import com.funtester.frame.SourceCode
import com.funtester.frame.execute.FunQpsConcurrent
import org.elasticsearch.index.query.QueryBuilders
import java.util.concurrent.atomic.AtomicInteger
class ESC extends SourceCode {
static void main(String[] args) {
def client = new ESClient("127.0.0.1", 9200, "http")
def data = new JSONObject()
data.name = "FunTester"
data.age = getRandomInt(100)
def index = new AtomicInteger(0)
def test = {
client.search("fun", QueryBuilders.matchQuery("time", getRandomInt(10)))
}
new FunQpsConcurrent(test, "ES搜索").start()
}
}
package com.funtester.es
import com.funtester.frame.SourceCode
import groovy.util.logging.Log4j2
import org.apache.http.HttpHost
import org.elasticsearch.action.delete.DeleteRequest
import org.elasticsearch.action.get.GetRequest
import org.elasticsearch.action.get.GetResponse
import org.elasticsearch.action.index.IndexRequest
import org.elasticsearch.action.index.IndexResponse
import org.elasticsearch.action.search.SearchRequest
import org.elasticsearch.action.search.SearchResponse
import org.elasticsearch.action.search.SearchScrollRequest
import org.elasticsearch.client.RequestOptions
import org.elasticsearch.client.RestClient
import org.elasticsearch.client.RestHighLevelClient
import org.elasticsearch.common.unit.TimeValue
import org.elasticsearch.index.query.QueryBuilder
import org.elasticsearch.search.SearchHits
import org.elasticsearch.search.builder.SearchSourceBuilder
import org.elasticsearch.search.fetch.subphase.FetchSourceContext
import java.util.concurrent.TimeUnit
/**
* ES客户端API练习类
*/
@Log4j2
class ESClient extends SourceCode {
String host
int port
String scheme
RestHighLevelClient client
ESClient(String host, int port = 9200, String scheme = "http") {
this.host = host
this.port = port
this.scheme = scheme
// 设置验证信息，填写账号及密码
// CredentialsProvider credentialsProvider = new BasicCredentialsProvider()
// credentialsProvider.setCredentials(AuthScope.ANY, new UsernamePasswordCredentials("user", "passwd"))
def builder = RestClient.builder(new HttpHost(host, port, scheme))
// 设置认证信息
// builder.setHttpClientConfigCallback(new RestClientBuilder.HttpClientConfigCallback() {
//
// @Override
// public HttpAsyncClientBuilder customizeHttpClient(HttpAsyncClientBuilder httpClientBuilder) {
// return httpClientBuilder.setDefaultCredentialsProvider(credentialsProvider)
// }
// })
builder.setMaxRetryTimeoutMillis(1000)
client = new RestHighLevelClient(builder)
}
/**
* 添加数据
* @param index
* @param type
* @param data
* @return
*/
def index(String index, type, Map data) {
IndexRequest indexRequest = new IndexRequest(index, type).source(data)
IndexResponse indexResponse = client.index(indexRequest, RequestOptions.DEFAULT)
indexResponse.getId()
}
/**
* 获取数据
* @param index
* @param type
* @param id
* @return
*/
def get(String index, type, id) {
// 查询文档
GetRequest getRequest = new GetRequest(index, type, id)
GetResponse getResponse = client.get(getRequest, RequestOptions.DEFAULT)
if (getResponse.isExists()) {
getResponse.getSourceAsString()
}
}
/**
* 数据是否存在
* @param index
* @param type
* @param id
* @return
*/
def exists(String index, type, id) {
GetRequest getRequest = new GetRequest(index, type, id)
getRequest.fetchSourceContext(new FetchSourceContext(false))
getRequest.storedFields("_none_")
client.exists(getRequest, RequestOptions.DEFAULT)
}
/**
* 删除数据
* @param index
* @param type
* @param id
* @return
*/
def delete(String index, type, id) {
DeleteRequest deleteRequest = new DeleteRequest(index, type, id)
client.delete(deleteRequest, RequestOptions.DEFAULT)
}
/**
* 搜索数据
* @param index
* @param query
* @param size
* @return
*/
def search(String index, QueryBuilder query, int size = 10) {
SearchRequest searchRequest = new SearchRequest(index)
SearchSourceBuilder sourceBuilder = new SearchSourceBuilder()
sourceBuilder.query(query)
sourceBuilder.from(0)
sourceBuilder.size(size)
sourceBuilder.timeout(new TimeValue(1, TimeUnit.SECONDS))
searchRequest.source(sourceBuilder)
client.search(searchRequest, RequestOptions.DEFAULT)
}
/**
* 滚动搜索
* @param index
* @param query
* @param size
*/
def searchScroll(String index, QueryBuilder query, int size = 10) {
SearchRequest searchRequest = new SearchRequest(index)
SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder()
searchSourceBuilder.query(query)
searchSourceBuilder.size(size)
searchRequest.source(searchSourceBuilder)
searchRequest.scroll(TimeValue.timeValueMinutes(1L))
SearchResponse searchResponse = client.search(searchRequest, RequestOptions.DEFAULT)
String scrollId = searchResponse.getScrollId()
SearchHits hits = searchResponse.getHits()
def searchHits = hits.getHits()
while (searchHits != null && searchHits.length > 0) {
SearchScrollRequest scrollRequest = new SearchScrollRequest(scrollId)
scrollRequest.scroll(TimeValue.timeValueMinutes(1L))
searchResponse = client.scroll(scrollRequest, RequestOptions.DEFAULT)
scrollId = searchResponse.getScrollId()
searchHits = searchResponse.getHits().getHits()
}
}
def close() {
client.close()
}
}
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