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Posted to notifications@shardingsphere.apache.org by me...@apache.org on 2022/07/10 15:58:06 UTC

[shardingsphere] branch master updated: Add more assertion for ResourceSwitchManagerTest (#19006)

This is an automated email from the ASF dual-hosted git repository.

menghaoran pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/shardingsphere.git


The following commit(s) were added to refs/heads/master by this push:
     new 666ada29945 Add more assertion for ResourceSwitchManagerTest (#19006)
666ada29945 is described below

commit 666ada29945242aed994efca0001bdc4013226f1
Author: Liang Zhang <zh...@apache.org>
AuthorDate: Sun Jul 10 23:58:00 2022 +0800

    Add more assertion for ResourceSwitchManagerTest (#19006)
    
    * Add more assertion for ResourceSwitchManagerTest
    
    * Refactor MockedDataSource
    
    * Fix test case
    
    * Fix test case
    
    * Fix test case
---
 .../props/DataSourcePropertiesCreator.java         |  2 +-
 .../resource/ShardingSphereResourceTest.java       |  5 +-
 .../switcher/ResourceSwitchManagerTest.java        | 72 +++++++++++++++++-----
 .../fixture/MockedDataSourcePoolFieldMetaData.java | 39 ++++++------
 .../fixture/MockedDataSourcePoolMetaData.java      | 65 +++++++++++++++++++
 ...datasource.pool.metadata.DataSourcePoolMetaData | 18 ++++++
 .../fixture/MockedDataSourcePoolFieldMetaData.java | 39 ++++++------
 .../fixture/MockedDataSourcePoolMetaData.java      | 65 +++++++++++++++++++
 ...datasource.pool.metadata.DataSourcePoolMetaData | 18 ++++++
 .../shardingsphere/test/mock/MockedDataSource.java |  2 +-
 10 files changed, 268 insertions(+), 57 deletions(-)

diff --git a/shardingsphere-infra/shardingsphere-infra-common/src/main/java/org/apache/shardingsphere/infra/datasource/props/DataSourcePropertiesCreator.java b/shardingsphere-infra/shardingsphere-infra-common/src/main/java/org/apache/shardingsphere/infra/datasource/props/DataSourcePropertiesCreator.java
index f3e4cacd0f8..4952f04bdf8 100644
--- a/shardingsphere-infra/shardingsphere-infra-common/src/main/java/org/apache/shardingsphere/infra/datasource/props/DataSourcePropertiesCreator.java
+++ b/shardingsphere-infra/shardingsphere-infra-common/src/main/java/org/apache/shardingsphere/infra/datasource/props/DataSourcePropertiesCreator.java
@@ -81,7 +81,7 @@ public final class DataSourcePropertiesCreator {
         for (Entry<String, Object> entry : new DataSourceReflection(dataSource).convertToProperties().entrySet()) {
             String propertyName = entry.getKey();
             Object propertyValue = entry.getValue();
-            if (!poolMetaData.isPresent() || isValidProperty(propertyName, propertyValue, poolMetaData.get())) {
+            if (!poolMetaData.isPresent() || isValidProperty(propertyName, propertyValue, poolMetaData.get()) && !poolMetaData.get().getTransientFieldNames().contains(propertyName)) {
                 result.put(propertyName, propertyValue);
             }
         }
diff --git a/shardingsphere-infra/shardingsphere-infra-common/src/test/java/org/apache/shardingsphere/infra/metadata/database/resource/ShardingSphereResourceTest.java b/shardingsphere-infra/shardingsphere-infra-common/src/test/java/org/apache/shardingsphere/infra/metadata/database/resource/ShardingSphereResourceTest.java
index 3b4bba1f031..44ec2b4668a 100644
--- a/shardingsphere-infra/shardingsphere-infra-common/src/test/java/org/apache/shardingsphere/infra/metadata/database/resource/ShardingSphereResourceTest.java
+++ b/shardingsphere-infra/shardingsphere-infra-common/src/test/java/org/apache/shardingsphere/infra/metadata/database/resource/ShardingSphereResourceTest.java
@@ -28,13 +28,14 @@ import static org.junit.Assert.assertTrue;
 
 public final class ShardingSphereResourceTest {
     
+    @SuppressWarnings("BusyWait")
     @Test
     public void assertClose() throws SQLException, IOException, InterruptedException {
         MockedDataSource dataSource = new MockedDataSource();
         new ShardingSphereResource(Collections.singletonMap("foo_ds", dataSource)).close(dataSource);
-        while (null == dataSource.getClosed() || !dataSource.getClosed()) {
+        while (!dataSource.isClosed()) {
             Thread.sleep(10L);
         }
-        assertTrue(dataSource.getClosed());
+        assertTrue(dataSource.isClosed());
     }
 }
diff --git a/shardingsphere-mode/shardingsphere-mode-core/src/test/java/org/apache/shardingsphere/mode/manager/switcher/ResourceSwitchManagerTest.java b/shardingsphere-mode/shardingsphere-mode-core/src/test/java/org/apache/shardingsphere/mode/manager/switcher/ResourceSwitchManagerTest.java
index bf29b86f5c8..e4a4c3c6df4 100644
--- a/shardingsphere-mode/shardingsphere-mode-core/src/test/java/org/apache/shardingsphere/mode/manager/switcher/ResourceSwitchManagerTest.java
+++ b/shardingsphere-mode/shardingsphere-mode-core/src/test/java/org/apache/shardingsphere/mode/manager/switcher/ResourceSwitchManagerTest.java
@@ -17,32 +17,70 @@
 
 package org.apache.shardingsphere.mode.manager.switcher;
 
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.Map;
 import org.apache.shardingsphere.infra.datasource.props.DataSourceProperties;
 import org.apache.shardingsphere.infra.metadata.database.resource.ShardingSphereResource;
 import org.apache.shardingsphere.test.mock.MockedDataSource;
 import org.junit.Test;
 
-import static org.junit.Assert.assertTrue;
+import javax.sql.DataSource;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.Map;
 
-public class ResourceSwitchManagerTest {
+import static org.hamcrest.CoreMatchers.is;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertThat;
+import static org.junit.Assert.assertTrue;
 
+public final class ResourceSwitchManagerTest {
+    
     @Test
-    public void assertCreate() {
-        MockedDataSource dataSource = new MockedDataSource();
-        ShardingSphereResource resource = new ShardingSphereResource(Collections.singletonMap("foo_ds", dataSource));
-        DataSourceProperties dataSourceProperties =
-                new DataSourceProperties(MockedDataSource.class.getName(), createUserProperties("foo"));
-        ResourceSwitchManager manager = new ResourceSwitchManager();
-        SwitchingResource switchingResource = manager.create(resource, Collections.singletonMap("db", dataSourceProperties));
-        assertTrue(switchingResource.getNewDataSources().containsKey("db"));
+    public void assertCreate() throws InterruptedException {
+        Map<String, DataSource> dataSourceMap = createDataSourceMap();
+        SwitchingResource actual = new ResourceSwitchManager().create(new ShardingSphereResource(dataSourceMap), createToBeChangedDataSourcePropsMap());
+        assertNewDataSources(actual);
+        actual.closeStaleDataSources();
+        assertStaleDataSources(dataSourceMap);
     }
-
-    private Map<String, Object> createUserProperties(final String username) {
-        Map<String, Object> result = new LinkedHashMap<>(1, 1);
-        result.put("username", username);
+    
+    private Map<String, DataSource> createDataSourceMap() {
+        Map<String, DataSource> result = new HashMap<>(3, 1);
+        result.put("not_change", new MockedDataSource());
+        result.put("replace", new MockedDataSource());
+        result.put("delete", new MockedDataSource());
         return result;
     }
+    
+    private Map<String, DataSourceProperties> createToBeChangedDataSourcePropsMap() {
+        Map<String, DataSourceProperties> result = new HashMap<>(3, 1);
+        result.put("new", new DataSourceProperties(MockedDataSource.class.getName(), Collections.emptyMap()));
+        result.put("not_change", new DataSourceProperties(MockedDataSource.class.getName(), Collections.emptyMap()));
+        result.put("replace", new DataSourceProperties(MockedDataSource.class.getName(), Collections.singletonMap("password", "new_pwd")));
+        return result;
+    }
+    
+    private void assertNewDataSources(final SwitchingResource actual) {
+        assertThat(actual.getNewDataSources().size(), is(3));
+        assertTrue(actual.getNewDataSources().containsKey("not_change"));
+        assertTrue(actual.getNewDataSources().containsKey("new"));
+        assertTrue(actual.getNewDataSources().containsKey("replace"));
+    }
+    
+    private void assertStaleDataSources(final Map<String, DataSource> originalDataSourceMap) throws InterruptedException {
+        assertStaleDataSource((MockedDataSource) originalDataSourceMap.get("delete"));
+        assertStaleDataSource((MockedDataSource) originalDataSourceMap.get("replace"));
+        assertNotStaleDataSource((MockedDataSource) originalDataSourceMap.get("not_change"));
+    }
+    
+    @SuppressWarnings("BusyWait")
+    private void assertStaleDataSource(final MockedDataSource dataSource) throws InterruptedException {
+        while (!dataSource.isClosed()) {
+            Thread.sleep(10L);
+        }
+        assertTrue(dataSource.isClosed());
+    }
+    
+    private void assertNotStaleDataSource(final MockedDataSource dataSource) {
+        assertFalse(dataSource.isClosed());
+    }
 }
diff --git a/shardingsphere-infra/shardingsphere-infra-common/src/test/java/org/apache/shardingsphere/infra/metadata/database/resource/ShardingSphereResourceTest.java b/shardingsphere-mode/shardingsphere-mode-core/src/test/java/org/apache/shardingsphere/mode/metadata/persist/fixture/MockedDataSourcePoolFieldMetaData.java
similarity index 52%
copy from shardingsphere-infra/shardingsphere-infra-common/src/test/java/org/apache/shardingsphere/infra/metadata/database/resource/ShardingSphereResourceTest.java
copy to shardingsphere-mode/shardingsphere-mode-core/src/test/java/org/apache/shardingsphere/mode/metadata/persist/fixture/MockedDataSourcePoolFieldMetaData.java
index 3b4bba1f031..76bce640d74 100644
--- a/shardingsphere-infra/shardingsphere-infra-common/src/test/java/org/apache/shardingsphere/infra/metadata/database/resource/ShardingSphereResourceTest.java
+++ b/shardingsphere-mode/shardingsphere-mode-core/src/test/java/org/apache/shardingsphere/mode/metadata/persist/fixture/MockedDataSourcePoolFieldMetaData.java
@@ -15,26 +15,29 @@
  * limitations under the License.
  */
 
-package org.apache.shardingsphere.infra.metadata.database.resource;
+package org.apache.shardingsphere.mode.metadata.persist.fixture;
 
-import org.apache.shardingsphere.test.mock.MockedDataSource;
-import org.junit.Test;
+import org.apache.shardingsphere.infra.datasource.pool.metadata.DataSourcePoolFieldMetaData;
 
-import java.io.IOException;
-import java.sql.SQLException;
-import java.util.Collections;
-
-import static org.junit.Assert.assertTrue;
-
-public final class ShardingSphereResourceTest {
+public final class MockedDataSourcePoolFieldMetaData implements DataSourcePoolFieldMetaData {
+    
+    @Override
+    public String getUsernameFieldName() {
+        return "username";
+    }
+    
+    @Override
+    public String getPasswordFieldName() {
+        return "password";
+    }
+    
+    @Override
+    public String getJdbcUrlFieldName() {
+        return "url";
+    }
     
-    @Test
-    public void assertClose() throws SQLException, IOException, InterruptedException {
-        MockedDataSource dataSource = new MockedDataSource();
-        new ShardingSphereResource(Collections.singletonMap("foo_ds", dataSource)).close(dataSource);
-        while (null == dataSource.getClosed() || !dataSource.getClosed()) {
-            Thread.sleep(10L);
-        }
-        assertTrue(dataSource.getClosed());
+    @Override
+    public String getJdbcUrlPropertiesFieldName() {
+        return "jdbcUrlProperties";
     }
 }
diff --git a/shardingsphere-mode/shardingsphere-mode-core/src/test/java/org/apache/shardingsphere/mode/metadata/persist/fixture/MockedDataSourcePoolMetaData.java b/shardingsphere-mode/shardingsphere-mode-core/src/test/java/org/apache/shardingsphere/mode/metadata/persist/fixture/MockedDataSourcePoolMetaData.java
new file mode 100644
index 00000000000..f4330b58ad9
--- /dev/null
+++ b/shardingsphere-mode/shardingsphere-mode-core/src/test/java/org/apache/shardingsphere/mode/metadata/persist/fixture/MockedDataSourcePoolMetaData.java
@@ -0,0 +1,65 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.shardingsphere.mode.metadata.persist.fixture;
+
+import org.apache.shardingsphere.infra.datasource.pool.metadata.DataSourcePoolFieldMetaData;
+import org.apache.shardingsphere.infra.datasource.pool.metadata.DataSourcePoolMetaData;
+
+import java.util.Collection;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.Map;
+
+public final class MockedDataSourcePoolMetaData implements DataSourcePoolMetaData {
+    
+    @Override
+    public Map<String, Object> getDefaultProperties() {
+        return Collections.singletonMap("maxPoolSize", 100);
+    }
+    
+    @Override
+    public Map<String, Object> getInvalidProperties() {
+        Map<String, Object> result = new HashMap<>(2, 1);
+        result.put("maxPoolSize", -1);
+        result.put("minPoolSize", -1);
+        return result;
+    }
+    
+    @Override
+    public Map<String, String> getPropertySynonyms() {
+        Map<String, String> result = new HashMap<>(2, 1);
+        result.put("maxPoolSize", "maxPoolSize");
+        result.put("minPoolSize", "minPoolSize");
+        return result;
+    }
+    
+    @Override
+    public Collection<String> getTransientFieldNames() {
+        return Collections.singleton("closed");
+    }
+    
+    @Override
+    public DataSourcePoolFieldMetaData getFieldMetaData() {
+        return new MockedDataSourcePoolFieldMetaData();
+    }
+    
+    @Override
+    public String getType() {
+        return "org.apache.shardingsphere.test.mock.MockedDataSource";
+    }
+}
diff --git a/shardingsphere-mode/shardingsphere-mode-core/src/test/resources/META-INF/services/org.apache.shardingsphere.infra.datasource.pool.metadata.DataSourcePoolMetaData b/shardingsphere-mode/shardingsphere-mode-core/src/test/resources/META-INF/services/org.apache.shardingsphere.infra.datasource.pool.metadata.DataSourcePoolMetaData
new file mode 100644
index 00000000000..33af3f7897f
--- /dev/null
+++ b/shardingsphere-mode/shardingsphere-mode-core/src/test/resources/META-INF/services/org.apache.shardingsphere.infra.datasource.pool.metadata.DataSourcePoolMetaData
@@ -0,0 +1,18 @@
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (the "License"); you may not use this file except in compliance with
+# the License.  You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+org.apache.shardingsphere.mode.metadata.persist.fixture.MockedDataSourcePoolMetaData
diff --git a/shardingsphere-infra/shardingsphere-infra-common/src/test/java/org/apache/shardingsphere/infra/metadata/database/resource/ShardingSphereResourceTest.java b/shardingsphere-proxy/shardingsphere-proxy-backend/src/test/java/org/apache/shardingsphere/proxy/backend/text/distsql/fixture/MockedDataSourcePoolFieldMetaData.java
similarity index 52%
copy from shardingsphere-infra/shardingsphere-infra-common/src/test/java/org/apache/shardingsphere/infra/metadata/database/resource/ShardingSphereResourceTest.java
copy to shardingsphere-proxy/shardingsphere-proxy-backend/src/test/java/org/apache/shardingsphere/proxy/backend/text/distsql/fixture/MockedDataSourcePoolFieldMetaData.java
index 3b4bba1f031..40fea341a32 100644
--- a/shardingsphere-infra/shardingsphere-infra-common/src/test/java/org/apache/shardingsphere/infra/metadata/database/resource/ShardingSphereResourceTest.java
+++ b/shardingsphere-proxy/shardingsphere-proxy-backend/src/test/java/org/apache/shardingsphere/proxy/backend/text/distsql/fixture/MockedDataSourcePoolFieldMetaData.java
@@ -15,26 +15,29 @@
  * limitations under the License.
  */
 
-package org.apache.shardingsphere.infra.metadata.database.resource;
+package org.apache.shardingsphere.proxy.backend.text.distsql.fixture;
 
-import org.apache.shardingsphere.test.mock.MockedDataSource;
-import org.junit.Test;
+import org.apache.shardingsphere.infra.datasource.pool.metadata.DataSourcePoolFieldMetaData;
 
-import java.io.IOException;
-import java.sql.SQLException;
-import java.util.Collections;
-
-import static org.junit.Assert.assertTrue;
-
-public final class ShardingSphereResourceTest {
+public final class MockedDataSourcePoolFieldMetaData implements DataSourcePoolFieldMetaData {
+    
+    @Override
+    public String getUsernameFieldName() {
+        return "username";
+    }
+    
+    @Override
+    public String getPasswordFieldName() {
+        return "password";
+    }
+    
+    @Override
+    public String getJdbcUrlFieldName() {
+        return "url";
+    }
     
-    @Test
-    public void assertClose() throws SQLException, IOException, InterruptedException {
-        MockedDataSource dataSource = new MockedDataSource();
-        new ShardingSphereResource(Collections.singletonMap("foo_ds", dataSource)).close(dataSource);
-        while (null == dataSource.getClosed() || !dataSource.getClosed()) {
-            Thread.sleep(10L);
-        }
-        assertTrue(dataSource.getClosed());
+    @Override
+    public String getJdbcUrlPropertiesFieldName() {
+        return "jdbcUrlProperties";
     }
 }
diff --git a/shardingsphere-proxy/shardingsphere-proxy-backend/src/test/java/org/apache/shardingsphere/proxy/backend/text/distsql/fixture/MockedDataSourcePoolMetaData.java b/shardingsphere-proxy/shardingsphere-proxy-backend/src/test/java/org/apache/shardingsphere/proxy/backend/text/distsql/fixture/MockedDataSourcePoolMetaData.java
new file mode 100644
index 00000000000..05dcdc3dc2e
--- /dev/null
+++ b/shardingsphere-proxy/shardingsphere-proxy-backend/src/test/java/org/apache/shardingsphere/proxy/backend/text/distsql/fixture/MockedDataSourcePoolMetaData.java
@@ -0,0 +1,65 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.shardingsphere.proxy.backend.text.distsql.fixture;
+
+import org.apache.shardingsphere.infra.datasource.pool.metadata.DataSourcePoolFieldMetaData;
+import org.apache.shardingsphere.infra.datasource.pool.metadata.DataSourcePoolMetaData;
+
+import java.util.Collection;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.Map;
+
+public final class MockedDataSourcePoolMetaData implements DataSourcePoolMetaData {
+    
+    @Override
+    public Map<String, Object> getDefaultProperties() {
+        return Collections.singletonMap("maxPoolSize", 100);
+    }
+    
+    @Override
+    public Map<String, Object> getInvalidProperties() {
+        Map<String, Object> result = new HashMap<>(2, 1);
+        result.put("maxPoolSize", -1);
+        result.put("minPoolSize", -1);
+        return result;
+    }
+    
+    @Override
+    public Map<String, String> getPropertySynonyms() {
+        Map<String, String> result = new HashMap<>(2, 1);
+        result.put("maxPoolSize", "maxPoolSize");
+        result.put("minPoolSize", "minPoolSize");
+        return result;
+    }
+    
+    @Override
+    public Collection<String> getTransientFieldNames() {
+        return Collections.singleton("closed");
+    }
+    
+    @Override
+    public DataSourcePoolFieldMetaData getFieldMetaData() {
+        return new MockedDataSourcePoolFieldMetaData();
+    }
+    
+    @Override
+    public String getType() {
+        return "org.apache.shardingsphere.test.mock.MockedDataSource";
+    }
+}
diff --git a/shardingsphere-proxy/shardingsphere-proxy-backend/src/test/resources/META-INF/services/org.apache.shardingsphere.infra.datasource.pool.metadata.DataSourcePoolMetaData b/shardingsphere-proxy/shardingsphere-proxy-backend/src/test/resources/META-INF/services/org.apache.shardingsphere.infra.datasource.pool.metadata.DataSourcePoolMetaData
new file mode 100644
index 00000000000..7cad279d417
--- /dev/null
+++ b/shardingsphere-proxy/shardingsphere-proxy-backend/src/test/resources/META-INF/services/org.apache.shardingsphere.infra.datasource.pool.metadata.DataSourcePoolMetaData
@@ -0,0 +1,18 @@
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (the "License"); you may not use this file except in compliance with
+# the License.  You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+org.apache.shardingsphere.proxy.backend.text.distsql.fixture.MockedDataSourcePoolMetaData
diff --git a/shardingsphere-test/shardingsphere-test-common/src/main/java/org/apache/shardingsphere/test/mock/MockedDataSource.java b/shardingsphere-test/shardingsphere-test-common/src/main/java/org/apache/shardingsphere/test/mock/MockedDataSource.java
index 66c8893dff0..9347514d085 100644
--- a/shardingsphere-test/shardingsphere-test-common/src/main/java/org/apache/shardingsphere/test/mock/MockedDataSource.java
+++ b/shardingsphere-test/shardingsphere-test-common/src/main/java/org/apache/shardingsphere/test/mock/MockedDataSource.java
@@ -64,7 +64,7 @@ public final class MockedDataSource implements DataSource, AutoCloseable {
     private Connection connection;
     
     @Setter(AccessLevel.NONE)
-    private Boolean closed;
+    private boolean closed;
     
     public MockedDataSource(final String url, final String username, final String password) {
         this.url = url;