diff options
Diffstat (limited to 'vpp-common/vpp-translate-utils/src/main/java/io/fd/honeycomb/translate/v3po/util/cache/DumpCacheManager.java')
-rw-r--r-- | vpp-common/vpp-translate-utils/src/main/java/io/fd/honeycomb/translate/v3po/util/cache/DumpCacheManager.java | 124 |
1 files changed, 124 insertions, 0 deletions
diff --git a/vpp-common/vpp-translate-utils/src/main/java/io/fd/honeycomb/translate/v3po/util/cache/DumpCacheManager.java b/vpp-common/vpp-translate-utils/src/main/java/io/fd/honeycomb/translate/v3po/util/cache/DumpCacheManager.java new file mode 100644 index 000000000..e5adb54ad --- /dev/null +++ b/vpp-common/vpp-translate-utils/src/main/java/io/fd/honeycomb/translate/v3po/util/cache/DumpCacheManager.java @@ -0,0 +1,124 @@ +/* + * Copyright (c) 2016 Cisco and/or its affiliates. + * + * 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 io.fd.honeycomb.translate.v3po.util.cache; + +import static com.google.common.base.Preconditions.checkNotNull; + +import com.google.common.base.Optional; +import io.fd.honeycomb.translate.v3po.util.cache.exceptions.check.DumpCheckFailedException; +import io.fd.honeycomb.translate.v3po.util.cache.exceptions.execution.DumpExecutionFailedException; +import io.fd.honeycomb.translate.v3po.util.cache.noop.NoopDumpPostProcessingFunction; +import io.fd.honeycomb.v3po.translate.ModificationCache; +import javax.annotation.Nonnull; +import org.openvpp.jvpp.dto.JVppReplyDump; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +/** + * Manager responsible for returning Data object dumps<br> either from cache or by invoking specified {@link + * EntityDumpExecutor} + */ +public final class DumpCacheManager<T extends JVppReplyDump, U> { + + private static final Logger LOG = LoggerFactory.getLogger(DumpCacheManager.class); + + private final EntityDumpExecutor<T, U> dumpExecutor; + private final EntityDumpNonEmptyCheck<T> dumpNonEmptyCheck; + private final EntityDumpPostProcessingFunction<T> postProcessor; + + private DumpCacheManager(DumpCacheManagerBuilder<T, U> builder) { + this.dumpExecutor = builder.dumpExecutor; + this.dumpNonEmptyCheck = builder.dumpNonEmptyCheck; + this.postProcessor = builder.postProcessingFunction; + } + + /** + * Returns {@link Optional<T>} of dump + */ + public Optional<T> getDump(@Nonnull String entityKey, @Nonnull ModificationCache cache) + throws DumpExecutionFailedException { + + //this key binding to every log has its logic ,because every customizer have its own cache manager and if + //there is need for debugging/fixing some complex call with a lot of data,you can get lost in those logs + LOG.debug("Loading dump for KEY[{}]", entityKey); + + T dump = (T) cache.get(entityKey); + + if (dump == null) { + LOG.debug("Dump for KEY[{}] not present in cache,invoking dump executor", entityKey); + + dump = dumpExecutor.executeDump(); + + //this is not a critical exception, so its only logged here + try { + dumpNonEmptyCheck.assertNotEmpty(dump); + } catch (DumpCheckFailedException e) { + LOG.warn("Dump for KEY[{}] has been resolved as empty", entityKey, e); + return Optional.absent(); + } + + //no need to check if post processor active,if wasnt set,default no-op will be used + LOG.debug("Post-processing dump for KEY[{}]", entityKey); + dump = postProcessor.apply(dump); + + LOG.debug("Caching dump for KEY[{}]", entityKey); + cache.put(entityKey, dump); + return Optional.of(dump); + } else { + return Optional.of(dump); + } + } + + public static final class DumpCacheManagerBuilder<T extends JVppReplyDump, U> { + + private EntityDumpExecutor<T, U> dumpExecutor; + private EntityDumpNonEmptyCheck<T> dumpNonEmptyCheck; + private EntityDumpPostProcessingFunction<T> postProcessingFunction; + + public DumpCacheManagerBuilder() { + //for cases when user does not set specific post-processor + postProcessingFunction = new NoopDumpPostProcessingFunction<T>(); + } + + public DumpCacheManagerBuilder<T, U> withExecutor(@Nonnull EntityDumpExecutor<T, U> executor) { + this.dumpExecutor = executor; + return this; + } + + public DumpCacheManagerBuilder<T, U> withNonEmptyPredicate(@Nonnull EntityDumpNonEmptyCheck<T> check) { + this.dumpNonEmptyCheck = check; + return this; + } + + public DumpCacheManagerBuilder<T, U> withPostProcessingFunction( + EntityDumpPostProcessingFunction<T> postProcessingFunction) { + this.postProcessingFunction = postProcessingFunction; + return this; + } + + public DumpCacheManager<T, U> build() { + checkNotNull(dumpExecutor, "Dump executor cannot be null"); + checkNotNull(dumpNonEmptyCheck, "Dump verifier cannot be null"); + checkNotNull(postProcessingFunction, + "Dump post-processor cannot be null cannot be null, default implementation is used if its not set"); + + return new DumpCacheManager<>(this); + } + } +} + + |