add httpclient close option to minio client builder (#1587)

Author: SerhiiKryvokin

Diff for: api/src/main/java/io/minio/MinioAsyncClient.java

@@ -3223,6 +3223,7 @@ public static final class Builder {
     private String region;
     private Provider provider;
     private OkHttpClient httpClient;
+    private boolean closeHttpClient;
 
     private void setAwsInfo(String host, boolean https) {
       this.awsS3Prefix = null;
@@ -3329,6 +3330,13 @@ public Builder httpClient(OkHttpClient httpClient) {
       return this;
     }
 
+    public Builder httpClient(OkHttpClient httpClient, boolean close) {
+      HttpUtils.validateNotNull(httpClient, "http client");
+      this.httpClient = httpClient;
+      this.closeHttpClient = close;
+      return this;
+    }
+
     public MinioAsyncClient build() {
       HttpUtils.validateNotNull(this.baseUrl, "endpoint");
 
@@ -3340,12 +3348,11 @@ public MinioAsyncClient build() {
             "Region missing in Amazon S3 China endpoint " + this.baseUrl);
       }
 
-      boolean closeHttpClient = false;
       if (this.httpClient == null) {
+        this.closeHttpClient = true;
         this.httpClient =
             HttpUtils.newDefaultHttpClient(
                 DEFAULT_CONNECTION_TIMEOUT, DEFAULT_CONNECTION_TIMEOUT, DEFAULT_CONNECTION_TIMEOUT);
-        closeHttpClient = true;
       }
 
       return new MinioAsyncClient(

Diff for: api/src/main/java/io/minio/MinioClient.java

@@ -2509,6 +2509,11 @@ public Builder httpClient(OkHttpClient httpClient) {
       return this;
     }
 
+    public Builder httpClient(OkHttpClient httpClient, boolean close) {
+      asyncClientBuilder.httpClient(httpClient, close);
+      return this;
+    }
+
     public MinioClient build() {
       MinioAsyncClient asyncClient = asyncClientBuilder.build();
       return new MinioClient(asyncClient);

Diff for: api/src/test/java/io/minio/MinioClientTest.java

@@ -27,6 +27,7 @@
 import java.util.HashMap;
 import java.util.Map;
 import javax.crypto.KeyGenerator;
+import okhttp3.OkHttpClient;
 import okhttp3.mockwebserver.MockResponse;
 import okhttp3.mockwebserver.MockWebServer;
 import okio.Buffer;
@@ -362,6 +363,25 @@ public void testAwsEndpoints()
         "https://s3-accelerate.dualstack.amazonaws.com.cn/mybucket/myobject", url.split("\\?")[0]);
   }
 
+  @Test
+  public void testCustomHttpClientClose() throws Exception {
+    OkHttpClient httpClient = new OkHttpClient().newBuilder().build();
+    Assert.assertFalse(httpClient.dispatcher().executorService().isShutdown());
+
+    MinioClient clientThatDoesntCloseHttpClient =
+        MinioClient.builder().endpoint("https://s3.amazonaws.com").httpClient(httpClient).build();
+    clientThatDoesntCloseHttpClient.close();
+    Assert.assertFalse(httpClient.dispatcher().executorService().isShutdown());
+
+    MinioClient clientThatClosesHttpClient =
+        MinioClient.builder()
+            .endpoint("https://s3.amazonaws.com")
+            .httpClient(httpClient, true)
+            .build();
+    clientThatClosesHttpClient.close();
+    Assert.assertTrue(httpClient.dispatcher().executorService().isShutdown());
+  }
+
   @Test(expected = IllegalArgumentException.class)
   public void testBucketName1()
       throws NoSuchAlgorithmException, IOException, InvalidKeyException, MinioException {