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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 org.apache.kafka.streams.state.internals;
import org.apache.kafka.streams.errors.InvalidStateStoreException;
import org.apache.kafka.streams.kstream.Windowed;
import org.apache.kafka.streams.state.KeyValueIterator;
import org.apache.kafka.streams.state.QueryableStoreType;
import org.apache.kafka.streams.state.ReadOnlySessionStore;
import java.util.List;
import java.util.Objects;
/**
* Wrapper over the underlying {@link ReadOnlySessionStore}s found in a {@link
* org.apache.kafka.streams.processor.internals.ProcessorTopology}
*/
public class CompositeReadOnlySessionStore implements ReadOnlySessionStore {
private final StateStoreProvider storeProvider;
private final QueryableStoreType> queryableStoreType;
private final String storeName;
public CompositeReadOnlySessionStore(final StateStoreProvider storeProvider,
final QueryableStoreType> queryableStoreType,
final String storeName) {
this.storeProvider = storeProvider;
this.queryableStoreType = queryableStoreType;
this.storeName = storeName;
}
@Override
public KeyValueIterator, V> findSessions(final K key,
final long earliestSessionEndTime,
final long latestSessionStartTime) {
Objects.requireNonNull(key, "key can't be null");
final List> stores = storeProvider.stores(storeName, queryableStoreType);
for (final ReadOnlySessionStore store : stores) {
try {
final KeyValueIterator, V> result =
store.findSessions(key, earliestSessionEndTime, latestSessionStartTime);
if (!result.hasNext()) {
result.close();
} else {
return result;
}
} catch (final InvalidStateStoreException ise) {
throw new InvalidStateStoreException(
"State store [" + storeName + "] is not available anymore" +
" and may have been migrated to another instance; " +
"please re-discover its location from the state metadata.",
ise
);
}
}
return KeyValueIterators.emptyIterator();
}
@Override
public KeyValueIterator, V> backwardFindSessions(final K key,
final long earliestSessionEndTime,
final long latestSessionStartTime) {
Objects.requireNonNull(key, "key can't be null");
final List> stores = storeProvider.stores(storeName, queryableStoreType);
for (final ReadOnlySessionStore store : stores) {
try {
final KeyValueIterator, V> result = store.backwardFindSessions(key, earliestSessionEndTime, latestSessionStartTime);
if (!result.hasNext()) {
result.close();
} else {
return result;
}
} catch (final InvalidStateStoreException ise) {
throw new InvalidStateStoreException(
"State store [" + storeName + "] is not available anymore" +
" and may have been migrated to another instance; " +
"please re-discover its location from the state metadata.",
ise
);
}
}
return KeyValueIterators.emptyIterator();
}
@Override
public KeyValueIterator, V> findSessions(final K keyFrom,
final K keyTo,
final long earliestSessionEndTime,
final long latestSessionStartTime) {
Objects.requireNonNull(keyFrom, "from can't be null");
Objects.requireNonNull(keyTo, "to can't be null");
final List> stores = storeProvider.stores(storeName, queryableStoreType);
for (final ReadOnlySessionStore store : stores) {
try {
final KeyValueIterator, V> result =
store.findSessions(keyFrom, keyTo, earliestSessionEndTime, latestSessionStartTime);
if (!result.hasNext()) {
result.close();
} else {
return result;
}
} catch (final InvalidStateStoreException ise) {
throw new InvalidStateStoreException(
"State store [" + storeName + "] is not available anymore" +
" and may have been migrated to another instance; " +
"please re-discover its location from the state metadata.",
ise
);
}
}
return KeyValueIterators.emptyIterator();
}
@Override
public KeyValueIterator, V> backwardFindSessions(final K keyFrom,
final K keyTo,
final long earliestSessionEndTime,
final long latestSessionStartTime) {
Objects.requireNonNull(keyFrom, "from can't be null");
Objects.requireNonNull(keyTo, "to can't be null");
final List> stores = storeProvider.stores(storeName, queryableStoreType);
for (final ReadOnlySessionStore store : stores) {
try {
final KeyValueIterator, V> result =
store.backwardFindSessions(keyFrom, keyTo, earliestSessionEndTime, latestSessionStartTime);
if (!result.hasNext()) {
result.close();
} else {
return result;
}
} catch (final InvalidStateStoreException ise) {
throw new InvalidStateStoreException(
"State store [" + storeName + "] is not available anymore" +
" and may have been migrated to another instance; " +
"please re-discover its location from the state metadata.",
ise
);
}
}
return KeyValueIterators.emptyIterator();
}
@Override
public V fetchSession(final K key, final long startTime, final long endTime) {
Objects.requireNonNull(key, "key can't be null");
final List> stores = storeProvider.stores(storeName, queryableStoreType);
for (final ReadOnlySessionStore store : stores) {
try {
return store.fetchSession(key, startTime, endTime);
} catch (final InvalidStateStoreException ise) {
throw new InvalidStateStoreException(
"State store [" + storeName + "] is not available anymore" +
" and may have been migrated to another instance; " +
"please re-discover its location from the state metadata.",
ise
);
}
}
return null;
}
@Override
public KeyValueIterator, V> fetch(final K key) {
Objects.requireNonNull(key, "key can't be null");
final List> stores = storeProvider.stores(storeName, queryableStoreType);
for (final ReadOnlySessionStore store : stores) {
try {
final KeyValueIterator, V> result = store.fetch(key);
if (!result.hasNext()) {
result.close();
} else {
return result;
}
} catch (final InvalidStateStoreException ise) {
throw new InvalidStateStoreException("State store [" + storeName + "] is not available anymore" +
" and may have been migrated to another instance; " +
"please re-discover its location from the state metadata. " +
"Original error message: " + ise.toString());
}
}
return KeyValueIterators.emptyIterator();
}
@Override
public KeyValueIterator, V> backwardFetch(final K key) {
Objects.requireNonNull(key, "key can't be null");
final List> stores = storeProvider.stores(storeName, queryableStoreType);
for (final ReadOnlySessionStore store : stores) {
try {
final KeyValueIterator, V> result = store.backwardFetch(key);
if (!result.hasNext()) {
result.close();
} else {
return result;
}
} catch (final InvalidStateStoreException ise) {
throw new InvalidStateStoreException(
"State store [" + storeName + "] is not available anymore" +
" and may have been migrated to another instance; " +
"please re-discover its location from the state metadata.",
ise
);
}
}
return KeyValueIterators.emptyIterator();
}
@Override
public KeyValueIterator, V> fetch(final K from, final K to) {
Objects.requireNonNull(from, "from can't be null");
Objects.requireNonNull(to, "to can't be null");
final NextIteratorFunction, V, ReadOnlySessionStore> nextIteratorFunction = store -> store.fetch(from, to);
return new DelegatingPeekingKeyValueIterator<>(storeName,
new CompositeKeyValueIterator<>(
storeProvider.stores(storeName, queryableStoreType).iterator(),
nextIteratorFunction));
}
@Override
public KeyValueIterator, V> backwardFetch(final K from, final K to) {
Objects.requireNonNull(from, "from can't be null");
Objects.requireNonNull(to, "to can't be null");
final NextIteratorFunction, V, ReadOnlySessionStore> nextIteratorFunction = store -> store.backwardFetch(from, to);
return new DelegatingPeekingKeyValueIterator<>(
storeName,
new CompositeKeyValueIterator<>(
storeProvider.stores(storeName, queryableStoreType).iterator(),
nextIteratorFunction
)
);
}
}
