components/camel-aws-ddb/src/test/java/org/apache/camel/component/aws/ddbstream/DdbStreamEndpointTest.java

/*
 * 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
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package org.apache.camel.component.aws.ddbstream;

import com.amazonaws.services.dynamodbv2.AmazonDynamoDBStreams;
import org.apache.camel.CamelContext;
import org.apache.camel.impl.DefaultCamelContext;
import org.apache.camel.support.SimpleRegistry;
import org.junit.Before;
import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.ExpectedException;
import org.junit.runner.RunWith;
import org.mockito.Mock;
import org.mockito.junit.MockitoJUnitRunner;

import static org.hamcrest.CoreMatchers.containsString;
import static org.hamcrest.CoreMatchers.is;
import static org.junit.Assert.assertThat;
import static org.mockito.Mockito.never;
import static org.mockito.Mockito.verify;
import static org.mockito.Mockito.when;

@RunWith(MockitoJUnitRunner.class)
public class DdbStreamEndpointTest {
    @Rule
    public ExpectedException expectedException = ExpectedException.none();

    private CamelContext context;

    @Mock
    private SequenceNumberProvider sequenceNumberProvider;
    @Mock
    private AmazonDynamoDBStreams amazonDynamoDBStreams;

    @Before
    public void setup() throws Exception {
        SimpleRegistry registry = new SimpleRegistry();
        registry.bind("someSeqNumProv", sequenceNumberProvider);
        registry.bind("ddbStreamsClient", amazonDynamoDBStreams);

        context = new DefaultCamelContext(registry);
    }

    @Test
    public void itExtractsTheSequenceNumber() throws Exception {
        when(sequenceNumberProvider.getSequenceNumber()).thenReturn("seq");

        DdbStreamEndpoint undertest = (DdbStreamEndpoint)context.getEndpoint("aws-ddbstream://table"
                + "?amazonDynamoDbStreamsClient=#ddbStreamsClient"
                + "&iteratorType=AFTER_SEQUENCE_NUMBER"
                + "&sequenceNumberProvider=#someSeqNumProv");

        assertThat(undertest.getSequenceNumber(), is("seq"));
    }

    @Test
    public void itExtractsTheSequenceNumberFromALiteralString() throws Exception {

        DdbStreamEndpoint undertest = (DdbStreamEndpoint)context.getEndpoint("aws-ddbstream://table"
                + "?amazonDynamoDbStreamsClient=#ddbStreamsClient"
                + "&iteratorType=AFTER_SEQUENCE_NUMBER"
                + "&sequenceNumberProvider=seq");

        assertThat(undertest.getSequenceNumber(), is("seq"));
    }

    @Test
    public void onSequenceNumberAgnosticIteratorsTheProviderIsIgnored() throws Exception {
        DdbStreamEndpoint undertest = (DdbStreamEndpoint)context.getEndpoint("aws-ddbstream://table"
                + "?amazonDynamoDbStreamsClient=#ddbStreamsClient"
                + "&iteratorType=LATEST"
                + "&sequenceNumberProvider=#someSeqNumProv");

        assertThat(undertest.getSequenceNumber(), is(""));
        verify(sequenceNumberProvider, never()).getSequenceNumber();
    }

    @Test
    public void sequenceNumberFetchingThrowsSomethingUsefulIfMisconfigurered() throws Exception {
        expectedException.expectMessage(containsString("sequenceNumberProvider"));

        DdbStreamEndpoint undertest = (DdbStreamEndpoint)context.getEndpoint("aws-ddbstream://table"
                + "?amazonDynamoDbStreamsClient=#ddbStreamsClient"
                + "&iteratorType=AT_SEQUENCE_NUMBER"); // NOTE: missing sequence number provider parameter

        undertest.getSequenceNumber();
    }
}