在高负载情况下，Apache HttpAsyncClient会挂起几秒钟：
我尝试通过创建最大具有200个连接的连接池的连接管理器，并通过运行单独的可运行线程来消除空闲的，过期的连接。
这是代码段
public void init() {
PoolingNHttpClientConnectionManager connectionManager = null;
try {
connectionManager = new PoolingNHttpClientConnectionManager (new DefaultConnectingIOReactor(IOReactorConfig.DEFAULT));
} catch (IOReactorException e1) {
}
// Increase max total connection to 200
connectionManager.setMaxTotal(200));
// Increase default max connection per route to 20
connectionManager.setDefaultMaxPerRoute(20);
// Increase max connections for localhost:80 to 50
HttpHost localhost = new HttpHost(127.0.0.1, 8080);
int maxPerRoute = Integer.parseInt(20);
connectionManager.setMaxPerRoute(new HttpRoute(localhost), maxPerRoute);
client = HttpAsyncClients.custom()
.setConnectionManager((NHttpClientConnectionManager) connectionManager)
.build();
client.start();
try {
url = new URL(httpParams.getUrlParam());
} catch (MalformedURLException e) {
e.printStackTrace();
}
}
上面的方法将在服务器启动时调用，下面的方法用于发起请求。
private void invokePostMethodWithJsonContent(final JSONObject content, URL url2) throws HTTPException {
HttpPost request = null;
Future<HttpResponse> future = null;
HttpResponse httpResp = null;
String responseMsg = null;
try {
request = new HttpPost(url2.toString());
request.setEntity(new StringEntity(content.toString(), ContentType.APPLICATION_JSON));
final RequestConfig requestConfig = RequestConfig.custom()
.setSocketTimeout(Integer.parseInt(httpParams.getReadTimeout()))
.setConnectTimeout(Integer.parseInt(httpParams.getConnectionTimeout()))
.setConnectionRequestTimeout(Integer.parseInt(httpParams.getReadTimeout())).build();
request.setConfig(requestConfig);
Long startTime = new Date().getTime();
LOGGER.debug("time {}", new Date().getTime());
future = client.execute(request, null);
httpResp = (HttpResponse) future.get();
if (httpResp != null && httpResp.getEntity() != null) {
final HttpEntity responseEntity = httpResp.getEntity();
if (responseEntity != null) {
responseMsg = EntityUtils.toString(responseEntity);
}
}
} catch (final IOException e) {
throw new HTTPException("Error in http adapter", "MPYHA00001", e);
} catch (final JSONException e) {
throw new HTTPException("Unable to process due to json error", "MPYHA00002", e);
} catch (final InterruptedException e) {
throw new HTTPException("Unable to connect http adapter", "MPYHA00003", e);
} catch (final ExecutionException e) {
throw new HTTPException("Error in http adapter", errorCode, e);
} finally {
httpResp = null;
future = null;
request = null;
}
}