DatabaseInstanceStatusRetryPolicyTest.java

/*
 * Copyright 2013-2014 the original author or authors.
 *
 * Licensed 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.springframework.cloud.aws.jdbc.retry;

import com.amazonaws.services.rds.AmazonRDS;
import com.amazonaws.services.rds.model.DBInstance;
import com.amazonaws.services.rds.model.DBInstanceNotFoundException;
import com.amazonaws.services.rds.model.DescribeDBInstancesRequest;
import com.amazonaws.services.rds.model.DescribeDBInstancesResult;
import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.ExpectedException;
import org.springframework.cloud.aws.core.env.ResourceIdResolver;
import org.springframework.dao.TransientDataAccessResourceException;
import org.springframework.retry.RetryContext;
import org.springframework.retry.context.RetryContextSupport;

import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.when;

/**
 * Unit test class for {@link DatabaseInstanceStatusRetryPolicy}
 *
 * @author Agim Emruli
 */
@SuppressWarnings("NonBooleanMethodNameMayNotStartWithQuestion")
public class DatabaseInstanceStatusRetryPolicyTest {

    @Rule
    public final ExpectedException expectedException = ExpectedException.none();

    @Test
    public void canRetry_retryPossibleDueToAvailableDatabase_returnsTrue() throws Exception {
        //Arrange
        AmazonRDS amazonRDS = mock(AmazonRDS.class);

        DatabaseInstanceStatusRetryPolicy policy = new DatabaseInstanceStatusRetryPolicy(amazonRDS, "test");
        when(amazonRDS.describeDBInstances(new DescribeDBInstancesRequest().withDBInstanceIdentifier("test"))).
                thenReturn(new DescribeDBInstancesResult().withDBInstances(new DBInstance().withDBInstanceStatus("available")));

        RetryContext retryContext = policy.open(new RetryContextSupport(null));

        //Act
        policy.registerThrowable(retryContext, new TransientDataAccessResourceException("not available"));

        //Assert
        assertTrue(policy.canRetry(retryContext));
        policy.close(retryContext);
    }

    @Test
    public void canRetry_withResourceIdResolver_returnsTrue() throws Exception {
        //Arrange
        AmazonRDS amazonRDS = mock(AmazonRDS.class);
        ResourceIdResolver resourceIdResolver = mock(ResourceIdResolver.class);

        DatabaseInstanceStatusRetryPolicy policy = new DatabaseInstanceStatusRetryPolicy(amazonRDS, "foo");
        when(amazonRDS.describeDBInstances(new DescribeDBInstancesRequest().withDBInstanceIdentifier("test"))).
                thenReturn(new DescribeDBInstancesResult().withDBInstances(new DBInstance().withDBInstanceStatus("available")));

        when(resourceIdResolver.resolveToPhysicalResourceId("foo")).thenReturn("test");

        policy.setResourceIdResolver(resourceIdResolver);


        RetryContext retryContext = policy.open(new RetryContextSupport(null));

        //Act
        policy.registerThrowable(retryContext, new TransientDataAccessResourceException("not available"));

        //Assert
        assertTrue(policy.canRetry(retryContext));
        policy.close(retryContext);
    }

    @Test
    public void canRetry_retryNotPossibleDueToNoDatabase_returnsFalse() throws Exception {
        //Arrange
        AmazonRDS amazonRDS = mock(AmazonRDS.class);

        DatabaseInstanceStatusRetryPolicy policy = new DatabaseInstanceStatusRetryPolicy(amazonRDS, "test");

        when(amazonRDS.describeDBInstances(new DescribeDBInstancesRequest().withDBInstanceIdentifier("test"))).
                thenThrow(new DBInstanceNotFoundException("test"));

        RetryContext retryContext = policy.open(new RetryContextSupport(null));

        //Act
        policy.registerThrowable(retryContext, new TransientDataAccessResourceException("not available"));

        //Assert
        assertFalse(policy.canRetry(retryContext));
        policy.close(retryContext);
    }

    @Test
    public void canRetry_multipleDatabasesFoundForInstanceIdentifier_reportsException() throws Exception {
        //Arrange
        this.expectedException.expect(IllegalStateException.class);
        this.expectedException.expectMessage("Multiple databases found for same identifier");

        AmazonRDS amazonRDS = mock(AmazonRDS.class);

        DatabaseInstanceStatusRetryPolicy policy = new DatabaseInstanceStatusRetryPolicy(amazonRDS, "test");

        DescribeDBInstancesResult describeDBInstancesResult = new DescribeDBInstancesResult().withDBInstances(new DBInstance(), new DBInstance());
        when(amazonRDS.describeDBInstances(new DescribeDBInstancesRequest().withDBInstanceIdentifier("test"))).
                thenReturn(describeDBInstancesResult);

        RetryContext retryContext = policy.open(new RetryContextSupport(null));

        //Act
        policy.registerThrowable(retryContext, new TransientDataAccessResourceException("not available"));

        //Assert
        policy.canRetry(retryContext);
    }

    @Test
    public void canRetry_noExceptionRegistered_returnsTrue() throws Exception {
        //Arrange
        AmazonRDS amazonRDS = mock(AmazonRDS.class);

        DatabaseInstanceStatusRetryPolicy policy = new DatabaseInstanceStatusRetryPolicy(amazonRDS, "test");

        RetryContext retryContext = new RetryContextSupport(null);

        //Act
        policy.open(retryContext);

        //Assert
        assertTrue(policy.canRetry(retryContext));
    }
}