diff --git a/spring-data-geode/src/main/java/org/springframework/data/gemfire/support/SingleCacheCacheResolver.java b/spring-data-geode/src/main/java/org/springframework/data/gemfire/support/SingleCacheCacheResolver.java new file mode 100644 index 00000000..59d16284 --- /dev/null +++ b/spring-data-geode/src/main/java/org/springframework/data/gemfire/support/SingleCacheCacheResolver.java @@ -0,0 +1,59 @@ +/* + * Copyright 2020 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 + * + * https://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.data.gemfire.support; + +import org.apache.geode.cache.Cache; +import org.apache.geode.cache.GemFireCache; +import org.apache.geode.cache.client.ClientCache; + +import org.springframework.data.gemfire.CacheResolver; +import org.springframework.lang.Nullable; + +/** + * {@link CacheResolver} implementation that resolves to a configured, single {@link GemFireCache} instance. + * + * @author John Blum + * @see org.apache.geode.cache.Cache + * @see org.apache.geode.cache.GemFireCache + * @see org.apache.geode.cache.client.ClientCache + * @since 2.3.0 + */ +public abstract class SingleCacheCacheResolver { + + /** + * Factory method used to resolve a single, configured instance of a {@literal peer} {@link Cache}. + * + * @param cache {@link Cache} to resolve. + * @return a single, configured instance of a {@literal peer} {@link Cache}. + * @see org.springframework.data.gemfire.CacheResolver + * @see org.apache.geode.cache.Cache + */ + public static CacheResolver from(@Nullable Cache cache) { + return () -> cache; + } + + /** + * Factory method used to resolve a single, configured instance of a {@literal peer} {@link ClientCache}. + * + * @param clientCache {@link ClientCache} to resolve. + * @return a single, configured instance of a {@literal peer} {@link ClientCache}. + * @see org.springframework.data.gemfire.CacheResolver + * @see org.apache.geode.cache.client.ClientCache + */ + public static CacheResolver from(@Nullable ClientCache clientCache) { + return () -> clientCache; + } +} diff --git a/spring-data-geode/src/test/java/org/springframework/data/gemfire/support/SingleCacheCacheResolverUnitTests.java b/spring-data-geode/src/test/java/org/springframework/data/gemfire/support/SingleCacheCacheResolverUnitTests.java new file mode 100644 index 00000000..aa7fd2cf --- /dev/null +++ b/spring-data-geode/src/test/java/org/springframework/data/gemfire/support/SingleCacheCacheResolverUnitTests.java @@ -0,0 +1,86 @@ +/* + * Copyright 2020 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 + * + * https://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.data.gemfire.support; + +import static org.assertj.core.api.Assertions.assertThat; +import static org.mockito.Mockito.mock; +import static org.mockito.Mockito.verifyNoInteractions; + +import org.junit.Test; + +import org.apache.geode.cache.Cache; +import org.apache.geode.cache.client.ClientCache; + +import org.springframework.data.gemfire.CacheResolver; + +/** + * Unit Tests for {@link SingleCacheCacheResolver}. + * + * @author John Blum + * @see org.junit.Test + * @see org.mockito.Mockito + * @see org.apache.geode.cache.Cache + * @see org.apache.geode.cache.client.ClientCache + * @see org.springframework.data.gemfire.CacheResolver + * @see org.springframework.data.gemfire.support.SingleCacheCacheResolver + * @since 2.3.0 + */ +public class SingleCacheCacheResolverUnitTests { + + @Test + public void fromCacheReturnsCacheResolverResolvingCache() { + + Cache mockCache = mock(Cache.class); + + CacheResolver cacheResolver = SingleCacheCacheResolver.from(mockCache); + + assertThat(cacheResolver).isNotNull(); + assertThat(cacheResolver.resolve()).isSameAs(mockCache); + + verifyNoInteractions(mockCache); + } + + @Test + public void fromNullCacheReturnsCacheResolverReturningNull() { + + CacheResolver cacheResolver = SingleCacheCacheResolver.from((Cache) null); + + assertThat(cacheResolver).isNotNull(); + assertThat(cacheResolver.resolve()).isNull(); + } + + @Test + public void fromClientCacheReturnsCacheResolverResolvingClientCache() { + + ClientCache mockClientCache = mock(ClientCache.class); + + CacheResolver clientCacheResolver = SingleCacheCacheResolver.from(mockClientCache); + + assertThat(clientCacheResolver).isNotNull(); + assertThat(clientCacheResolver.resolve()).isSameAs(mockClientCache); + + verifyNoInteractions(mockClientCache); + } + + @Test + public void fromNullClientCacheReturnsCacheResolverReturningNull() { + + CacheResolver cacheResolver = SingleCacheCacheResolver.from((ClientCache) null); + + assertThat(cacheResolver).isNotNull(); + assertThat(cacheResolver.resolve()).isNull(); + } +}