シーケンス
本稿では、ナコスクライアントのServerHttpAgentを見ます
HttpAgent
ナコス-1.1.3 /クライアント/ srcに/メイン/ javaの/ COM /アリババ/ナコス/クライアント/設定/ HTTP / HttpAgent.java
public interface HttpAgent {
/**
* start to get nacos ip list
* @return Nothing.
* @throws NacosException on get ip list error.
*/
void start() throws NacosException;
/**
* invoke http get method
* @param path http path
* @param headers http headers
* @param paramValues http paramValues http
* @param encoding http encode
* @param readTimeoutMs http timeout
* @return HttpResult http response
* @throws IOException If an input or output exception occurred
*/
HttpResult httpGet(String path, List<String> headers, List<String> paramValues, String encoding, long readTimeoutMs) throws IOException;
/**
* invoke http post method
* @param path http path
* @param headers http headers
* @param paramValues http paramValues http
* @param encoding http encode
* @param readTimeoutMs http timeout
* @return HttpResult http response
* @throws IOException If an input or output exception occurred
*/
HttpResult httpPost(String path, List<String> headers, List<String> paramValues, String encoding, long readTimeoutMs) throws IOException;
/**
* invoke http delete method
* @param path http path
* @param headers http headers
* @param paramValues http paramValues http
* @param encoding http encode
* @param readTimeoutMs http timeout
* @return HttpResult http response
* @throws IOException If an input or output exception occurred
*/
HttpResult httpDelete(String path, List<String> headers, List<String> paramValues, String encoding, long readTimeoutMs) throws IOException;
/**
* get name
* @return String
*/
String getName();
/**
* get namespace
* @return String
*/
String getNamespace();
/**
* get tenant
* @return String
*/
String getTenant();
/**
* get encode
* @return String
*/
String getEncode();
}
复制代码- HttpAgent定義スタート、HTTPGET、httpPost、httpDelete、のgetName、GETNAMESPACE、getTenant、getEncode方法
ServerHttpAgent
ナコス-1.1.3 /クライアント/ srcに/メイン/ javaの/ COM /アリババ/ナコス/クライアント/設定/ HTTP / ServerHttpAgent.java
public class ServerHttpAgent implements HttpAgent {
private static final Logger LOGGER = LogUtils.logger(ServerHttpAgent.class);
/**
* @param path 相对于web应用根，以/开头
* @param headers
* @param paramValues
* @param encoding
* @param readTimeoutMs
* @return
* @throws IOException
*/
@Override
public HttpResult httpGet(String path, List<String> headers, List<String> paramValues, String encoding,
long readTimeoutMs) throws IOException {
final long endTime = System.currentTimeMillis() + readTimeoutMs;
final boolean isSSL = false;
String currentServerAddr = serverListMgr.getCurrentServerAddr();
int maxRetry = this.maxRetry;
do {
try {
List<String> newHeaders = getSpasHeaders(paramValues);
if (headers != null) {
newHeaders.addAll(headers);
}
HttpResult result = HttpSimpleClient.httpGet(
getUrl(currentServerAddr, path), newHeaders, paramValues, encoding,
readTimeoutMs, isSSL);
if (result.code == HttpURLConnection.HTTP_INTERNAL_ERROR
|| result.code == HttpURLConnection.HTTP_BAD_GATEWAY
|| result.code == HttpURLConnection.HTTP_UNAVAILABLE) {
LOGGER.error("[NACOS ConnectException] currentServerAddr: {}, httpCode: {}",
serverListMgr.getCurrentServerAddr(), result.code);
} else {
// Update the currently available server addr
serverListMgr.updateCurrentServerAddr(currentServerAddr);
return result;
}
} catch (ConnectException ce) {
LOGGER.error("[NACOS ConnectException httpGet] currentServerAddr:{}, err : {}", serverListMgr.getCurrentServerAddr(), ce.getMessage());
} catch (SocketTimeoutException stoe) {
LOGGER.error("[NACOS SocketTimeoutException httpGet] currentServerAddr:{}， err : {}", serverListMgr.getCurrentServerAddr(), stoe.getMessage());
} catch (IOException ioe) {
LOGGER.error("[NACOS IOException httpGet] currentServerAddr: " + serverListMgr.getCurrentServerAddr(), ioe);
throw ioe;
}
if (serverListMgr.getIterator().hasNext()) {
currentServerAddr = serverListMgr.getIterator().next();
} else {
maxRetry --;
if (maxRetry < 0) {
throw new ConnectException("[NACOS HTTP-GET] The maximum number of tolerable server reconnection errors has been reached");
}
serverListMgr.refreshCurrentServerAddr();
}
} while (System.currentTimeMillis() <= endTime);
LOGGER.error("no available server");
throw new ConnectException("no available server");
}
@Override
public HttpResult httpPost(String path, List<String> headers, List<String> paramValues, String encoding,
long readTimeoutMs) throws IOException {
final long endTime = System.currentTimeMillis() + readTimeoutMs;
boolean isSSL = false;
String currentServerAddr = serverListMgr.getCurrentServerAddr();
int maxRetry = this.maxRetry;
do {
try {
List<String> newHeaders = getSpasHeaders(paramValues);
if (headers != null) {
newHeaders.addAll(headers);
}
HttpResult result = HttpSimpleClient.httpPost(
getUrl(currentServerAddr, path), newHeaders, paramValues, encoding,
readTimeoutMs, isSSL);
if (result.code == HttpURLConnection.HTTP_INTERNAL_ERROR
|| result.code == HttpURLConnection.HTTP_BAD_GATEWAY
|| result.code == HttpURLConnection.HTTP_UNAVAILABLE) {
LOGGER.error("[NACOS ConnectException] currentServerAddr: {}, httpCode: {}",
currentServerAddr, result.code);
} else {
// Update the currently available server addr
serverListMgr.updateCurrentServerAddr(currentServerAddr);
return result;
}
} catch (ConnectException ce) {
LOGGER.error("[NACOS ConnectException httpPost] currentServerAddr: {}, err : {}", currentServerAddr, ce.getMessage());
} catch (SocketTimeoutException stoe) {
LOGGER.error("[NACOS SocketTimeoutException httpPost] currentServerAddr: {}， err : {}", currentServerAddr, stoe.getMessage());
} catch (IOException ioe) {
LOGGER.error("[NACOS IOException httpPost] currentServerAddr: " + currentServerAddr, ioe);
throw ioe;
}
if (serverListMgr.getIterator().hasNext()) {
currentServerAddr = serverListMgr.getIterator().next();
} else {
maxRetry --;
if (maxRetry < 0) {
throw new ConnectException("[NACOS HTTP-POST] The maximum number of tolerable server reconnection errors has been reached");
}
serverListMgr.refreshCurrentServerAddr();
}
} while (System.currentTimeMillis() <= endTime);
LOGGER.error("no available server, currentServerAddr : {}", currentServerAddr);
throw new ConnectException("no available server, currentServerAddr : " + currentServerAddr);
}
//......
}
复制代码- ServerHttpAgent HttpAgentはHTTPGET、httpPost、実質的に同一の構造httpDelete方法インタフェースを実装するループは、ループ状態が開始されてから実行時間以下である間、実行させるreadTimeoutMs
- サイクルはserverListMgr.getCurrentServerAddr currentServerAddrを介して取得する（）メソッドを開始する前に、返されたHTTPコードHTTP_INTERNAL_ERROR、HTTP_BAD_GATEWAY、HTTP_UNAVAILABLE印刷エラーログ、さもなければserverListMgr.updateCurrentServerAddr（currentServerAddr）である場合、ループ本体は、対応する方法HttpSimpleClient要求によって実行されます、その後、戻ります
- そこには例外はありませんか事前に戻る場合は真が、その後serverListMgr.getIterator（）を使用している場合、それは、（）。のhasNext（）と判断serverListMgr.getIteratorです。次の（）currentServerAddrを更新し、偽のMAXRETRYをデクリメントされ、その後、（）serverListMgr.refreshCurrentServerAddrを行います
概要
ServerHttpAgent HttpAgentはHTTPGET、httpPost、実質的に同一の構造httpDelete方法インタフェースを実装するループは、ループ状態が開始されてから実行時間以下である間、実行させるreadTimeoutMs