Simplify Eureka HTTP client synchronization

Signed-off-by: Prahlad Bhakat <prahladbhakat05@gmail.com>

Author: PRAHLAD09-dev

spring-cloud-netflix-eureka-client/src/main/java/org/springframework/cloud/netflix/eureka/http/DefaultEurekaClientHttpRequestFactorySupplier.java

@@ -55,9 +55,7 @@ public class DefaultEurekaClientHttpRequestFactorySupplier implements EurekaClie
 
 	private final Set<RequestConfigCustomizer> requestConfigCustomizers;
 
-	private final Object lock = new Object();
-
-	private volatile CloseableHttpClient sharedHttpClient;
+	private CloseableHttpClient sharedHttpClient;
 
 	public DefaultEurekaClientHttpRequestFactorySupplier(TimeoutProperties timeoutProperties,
 			Set<RequestConfigCustomizer> requestConfigCustomizers) {
@@ -66,38 +64,34 @@ public DefaultEurekaClientHttpRequestFactorySupplier(TimeoutProperties timeoutPr
 	}
 
 	@Override
-	public ClientHttpRequestFactory get(SSLContext sslContext, @Nullable HostnameVerifier hostnameVerifier) {
-		CloseableHttpClient httpClient;
-		synchronized (this.lock) {
-			httpClient = this.sharedHttpClient;
-			if (httpClient == null) {
-				HttpClientBuilder httpClientBuilder = HttpClientBuilder.create();
-				if (sslContext != null || hostnameVerifier != null || timeoutProperties != null) {
-					httpClientBuilder
-						.setConnectionManager(buildConnectionManager(sslContext, hostnameVerifier, timeoutProperties));
-				}
-				httpClientBuilder.setDefaultRequestConfig(buildRequestConfig());
-				httpClient = httpClientBuilder.build();
-				this.sharedHttpClient = httpClient;
+	public synchronized ClientHttpRequestFactory get(SSLContext sslContext,
+			@Nullable HostnameVerifier hostnameVerifier) {
+		CloseableHttpClient httpClient = this.sharedHttpClient;
+		if (httpClient == null) {
+			HttpClientBuilder httpClientBuilder = HttpClientBuilder.create();
+			if (sslContext != null || hostnameVerifier != null || timeoutProperties != null) {
+				httpClientBuilder
+					.setConnectionManager(buildConnectionManager(sslContext, hostnameVerifier, timeoutProperties));
 			}
+			httpClientBuilder.setDefaultRequestConfig(buildRequestConfig());
+			httpClient = httpClientBuilder.build();
+			this.sharedHttpClient = httpClient;
 		}
 		HttpComponentsClientHttpRequestFactory requestFactory = new HttpComponentsClientHttpRequestFactory();
 		requestFactory.setHttpClient(httpClient);
 		return requestFactory;
 	}
 
 	@Override
-	public void close() {
-		synchronized (this.lock) {
-			CloseableHttpClient httpClient = this.sharedHttpClient;
-			this.sharedHttpClient = null;
-			if (httpClient != null) {
-				try {
-					httpClient.close();
-				}
-				catch (IOException ex) {
-					// best-effort close during shutdown; nothing actionable if it fails
-				}
+	public synchronized void close() {
+		CloseableHttpClient httpClient = this.sharedHttpClient;
+		this.sharedHttpClient = null;
+		if (httpClient != null) {
+			try {
+				httpClient.close();
+			}
+			catch (IOException ex) {
+				// best-effort close during shutdown; nothing actionable if it fails
 			}
 		}
 	}