diff options
Diffstat (limited to 'v3po/data-impl/src/main/java/io/fd/honeycomb/v3po/data/impl/ReadOnlyTransaction.java')
| -rw-r--r-- | v3po/data-impl/src/main/java/io/fd/honeycomb/v3po/data/impl/ReadOnlyTransaction.java | 105 |
1 files changed, 105 insertions, 0 deletions
diff --git a/v3po/data-impl/src/main/java/io/fd/honeycomb/v3po/data/impl/ReadOnlyTransaction.java b/v3po/data-impl/src/main/java/io/fd/honeycomb/v3po/data/impl/ReadOnlyTransaction.java new file mode 100644 index 000000000..83c9e30bd --- /dev/null +++ b/v3po/data-impl/src/main/java/io/fd/honeycomb/v3po/data/impl/ReadOnlyTransaction.java @@ -0,0 +1,105 @@ +/* + * 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.v3po.data.impl; + +import com.google.common.base.Function; +import com.google.common.base.Optional; +import com.google.common.base.Preconditions; +import com.google.common.util.concurrent.CheckedFuture; +import com.google.common.util.concurrent.Futures; +import com.google.common.util.concurrent.ListenableFuture; +import io.fd.honeycomb.v3po.data.ReadableDataTree; +import io.fd.honeycomb.v3po.data.DataTreeSnapshot; +import javax.annotation.Nonnull; +import javax.annotation.Nullable; +import org.opendaylight.controller.md.sal.common.api.data.LogicalDatastoreType; +import org.opendaylight.controller.md.sal.common.api.data.ReadFailedException; +import org.opendaylight.controller.md.sal.dom.api.DOMDataReadOnlyTransaction; +import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier; +import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +final class ReadOnlyTransaction implements DOMDataReadOnlyTransaction { + + private static final Logger LOG = LoggerFactory.getLogger(ReadOnlyTransaction.class); + private volatile ReadableDataTree operationalData; + private volatile DataTreeSnapshot configSnapshot; + + ReadOnlyTransaction(@Nonnull final ReadableDataTree operationalData, + @Nonnull final DataTreeSnapshot configSnapshot) { + this.operationalData = Preconditions.checkNotNull(operationalData, "operationalData should not be null"); + this.configSnapshot = Preconditions.checkNotNull(configSnapshot, "config should not be null"); + } + + @Override + public void close() { + configSnapshot = null; + operationalData = null; + } + + @Override + public CheckedFuture<Optional<NormalizedNode<?, ?>>, ReadFailedException> read( + final LogicalDatastoreType store, + final YangInstanceIdentifier path) { + LOG.debug("ReadOnlyTransaction.read(), store={}, path={}", store, path); + + Preconditions.checkState(configSnapshot != null, "Transaction was closed"); + + if (store == LogicalDatastoreType.OPERATIONAL) { + return operationalData.read(path); + } else { + return configSnapshot.read(path); + } + } + + @Override + public CheckedFuture<Boolean, ReadFailedException> exists(final LogicalDatastoreType store, + final YangInstanceIdentifier path) { + LOG.debug("ReadOnlyTransaction.exists() store={}, path={}", store, path); + + ListenableFuture<Boolean> listenableFuture = Futures.transform(read(store, path), IS_NODE_PRESENT); + + return Futures.makeChecked(listenableFuture, ANY_EX_TO_READ_FAILED_EXCEPTION_MAPPER); + } + + @Nonnull + @Override + public Object getIdentifier() { + return this; + } + + + private static final Function<? super Optional<NormalizedNode<?, ?>>, ? extends Boolean> IS_NODE_PRESENT = + new Function<Optional<NormalizedNode<?, ?>>, Boolean>() { + @Nullable + @Override + public Boolean apply(@Nullable final Optional<NormalizedNode<?, ?>> input) { + return input == null + ? Boolean.FALSE + : input.isPresent(); + } + }; + + private static final Function<? super Exception, ReadFailedException> ANY_EX_TO_READ_FAILED_EXCEPTION_MAPPER = + new Function<Exception, ReadFailedException>() { + @Override + public ReadFailedException apply(@Nullable final Exception e) { + return new ReadFailedException("Exists failed", e); + } + }; +}
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