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/*******************************************************************************
* ============LICENSE_START========================================================================
* ONAP : ccsdk feature sdnr wt
* =================================================================================================
* Copyright (C) 2019 highstreet technologies GmbH Intellectual Property. All rights reserved.
* =================================================================================================
* 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.
* ============LICENSE_END==========================================================================
******************************************************************************/
package org.onap.ccsdk.features.sdnr.wt.netconfnodestateservice.impl;
import com.google.common.base.Preconditions;
import com.google.common.util.concurrent.FluentFuture;
import java.util.NoSuchElementException;
import java.util.Optional;
import java.util.concurrent.CancellationException;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicReference;
import org.eclipse.jdt.annotation.NonNull;
import org.eclipse.jdt.annotation.Nullable;
import org.onap.ccsdk.features.sdnr.wt.common.util.StackTrace;
import org.onap.ccsdk.features.sdnr.wt.netconfnodestateservice.TransactionUtils;
import org.opendaylight.mdsal.binding.api.DataBroker;
import org.opendaylight.mdsal.binding.api.ReadTransaction;
import org.opendaylight.mdsal.common.api.LogicalDatastoreType;
import org.opendaylight.yangtools.yang.binding.DataObject;
import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public final class GenericTransactionUtils implements TransactionUtils {
static final Logger LOG = LoggerFactory.getLogger(GenericTransactionUtils.class);
/**
* Deliver the data back or null. Warning
*
* @param <T> SubType of the DataObject to be handled
* @param dataBroker for accessing data
* @param dataStoreType to address datastore
* @param iid id to access data
* @return null or object
*/
@Override
@Nullable
public <T extends DataObject> T readData(DataBroker dataBroker, LogicalDatastoreType dataStoreType,
InstanceIdentifier<T> iid) {
AtomicBoolean noErrorIndication = new AtomicBoolean();
AtomicReference<String> statusText = new AtomicReference<>();
@Nullable T obj = readDataOptionalWithStatus(dataBroker, dataStoreType, iid, noErrorIndication, statusText);
if (!noErrorIndication.get()) {
LOG.warn("Read transaction for identifier " + iid + " failed with status " + statusText.get());
}
return obj;
}
/**
* Deliver the data back or null
*
* @param <T> SubType of the DataObject to be handled
* @param dataBroker for accessing data
* @param dataStoreType to address datastore
* @param iid id to access data
* @param noErrorIndication (Output) true if data could be read and are available and is not null
* @param statusIndicator (Output) String with status indications during the read.
* @return null or object
*/
@Override
@SuppressWarnings("null")
public @Nullable <T extends DataObject> T readDataOptionalWithStatus(DataBroker dataBroker,
LogicalDatastoreType dataStoreType, InstanceIdentifier<T> iid, AtomicBoolean noErrorIndication,
AtomicReference<String> statusIndicator) {
@Nullable T data = null;
noErrorIndication.set(false);
statusIndicator.set("Preconditions");
Preconditions.checkNotNull(dataBroker);
int retry = 0;
int retryDelayMilliseconds = 2000;
int maxRetries = 0; // 0 no Retry
do {
if (retry > 0) {
try {
LOG.debug("Sleep {}ms", retryDelayMilliseconds);
Thread.sleep(retryDelayMilliseconds);
} catch (InterruptedException e) {
LOG.debug("Sleep interrupted", e);
Thread.currentThread().interrupt();
}
}
LOG.debug("Sending message with retry {} ", retry);
statusIndicator.set("Create Read Transaction");
ReadTransaction readTransaction = dataBroker.newReadOnlyTransaction();
try {
@NonNull FluentFuture<Optional<T>> od = readTransaction.read(dataStoreType, iid);
statusIndicator.set("Read done");
if (od != null) {
statusIndicator.set("Unwrap checkFuture done");
Optional<T> optionalData = od.get();
if (optionalData != null) {
statusIndicator.set("Unwrap optional done");
data = optionalData.orElse(null);
statusIndicator.set("Read transaction done");
noErrorIndication.set(true);
} else {
statusIndicator.set("optional Data is null");
}
} else {
statusIndicator.set("od feature is null");
}
} catch (CancellationException | ExecutionException | InterruptedException | NoSuchElementException e) {
statusIndicator.set(StackTrace.toString(e));
if (e instanceof InterruptedException) {
Thread.currentThread().interrupt();
}
LOG.debug("Exception during read", e);
}
} while (noErrorIndication.get() == false && retry++ < maxRetries);
LOG.debug("stage 2 noErrorIndication {} status text {}", noErrorIndication.get(), statusIndicator.get());
return data;
}
}
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