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/*
* Copyright (c) 2017 Pantheon Technologies, s.r.o. and others. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v1.0 which accompanies this distribution,
* and is available at http://www.eclipse.org/legal/epl-v10.html
*/
package org.opendaylight.netconf.sal.restconf.impl;
import com.google.common.util.concurrent.FutureCallback;
import com.google.common.util.concurrent.MoreExecutors;
import com.google.common.util.concurrent.SettableFuture;
import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
import java.util.AbstractMap.SimpleImmutableEntry;
import java.util.Collection;
import java.util.Map.Entry;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.atomic.AtomicIntegerFieldUpdater;
import org.opendaylight.mdsal.common.api.LogicalDatastoreType;
import org.opendaylight.mdsal.common.api.ReadFailedException;
import org.opendaylight.mdsal.dom.api.DOMDataTreeReadOperations;
import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
final class BatchedExistenceCheck {
private static final AtomicIntegerFieldUpdater<BatchedExistenceCheck> UPDATER =
AtomicIntegerFieldUpdater.newUpdater(BatchedExistenceCheck.class, "outstanding");
private final SettableFuture<Entry<YangInstanceIdentifier, ReadFailedException>> future = SettableFuture.create();
@SuppressWarnings("unused")
private volatile int outstanding;
private BatchedExistenceCheck(final int total) {
this.outstanding = total;
}
static BatchedExistenceCheck start(final DOMDataTreeReadOperations readTx,
final LogicalDatastoreType datastore, final YangInstanceIdentifier parentPath,
final Collection<? extends NormalizedNode> children) {
final BatchedExistenceCheck ret = new BatchedExistenceCheck(children.size());
for (NormalizedNode child : children) {
final YangInstanceIdentifier path = parentPath.node(child.getIdentifier());
readTx.exists(datastore, path).addCallback(new FutureCallback<Boolean>() {
@Override
public void onSuccess(final Boolean result) {
ret.complete(path, result);
}
@Override
@SuppressFBWarnings("BC_UNCONFIRMED_CAST_OF_RETURN_VALUE")
public void onFailure(final Throwable throwable) {
final Exception e;
if (throwable instanceof Exception) {
e = (Exception) throwable;
} else {
e = new ExecutionException(throwable);
}
ret.complete(path, ReadFailedException.MAPPER.apply(e));
}
}, MoreExecutors.directExecutor());
}
return ret;
}
Entry<YangInstanceIdentifier, ReadFailedException> getFailure() throws InterruptedException {
try {
return future.get();
} catch (ExecutionException e) {
// This should never happen
throw new IllegalStateException(e);
}
}
private void complete(final YangInstanceIdentifier childPath, final boolean present) {
final int count = UPDATER.decrementAndGet(this);
if (present) {
future.set(new SimpleImmutableEntry<>(childPath, null));
} else if (count == 0) {
future.set(null);
}
}
private void complete(final YangInstanceIdentifier childPath, final ReadFailedException cause) {
UPDATER.decrementAndGet(this);
future.set(new SimpleImmutableEntry<>(childPath, cause));
}
}
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