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GeodeBackend.java
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GeodeBackend.java
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/*
* Copyright 2019 Immutables Authors and Contributors
*
* 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 org.immutables.criteria.geode;
import io.reactivex.BackpressureStrategy;
import io.reactivex.Flowable;
import io.reactivex.FlowableEmitter;
import org.apache.geode.cache.Region;
import org.apache.geode.cache.query.CqAttributesFactory;
import org.apache.geode.cache.query.CqQuery;
import org.apache.geode.cache.query.QueryService;
import org.immutables.criteria.backend.Backend;
import org.immutables.criteria.backend.DefaultResult;
import org.immutables.criteria.backend.KeyExtractor;
import org.immutables.criteria.backend.PathNaming;
import org.immutables.criteria.backend.StandardOperations;
import org.immutables.criteria.backend.WatchEvent;
import org.reactivestreams.Publisher;
import java.util.Objects;
import java.util.logging.Logger;
/**
* Backend for <a href="https://geode.apache.org/">Apache Geode</a>
*/
public class GeodeBackend implements Backend {
static final Logger logger = Logger.getLogger(GeodeBackend.class.getName());
private final GeodeSetup setup;
private final PathNaming pathNaming;
public GeodeBackend(GeodeSetup setup) {
this.setup = Objects.requireNonNull(setup, "setup");
this.pathNaming = ReservedWordNaming.of(PathNaming.defaultNaming());
}
@Override
public Backend.Session open(Class<?> entityType) {
Objects.requireNonNull(entityType, "context");
return new Session(entityType, this);
}
static class Session implements Backend.Session {
final Class<?> entityType;
final Region<Object, Object> region;
final KeyExtractor keyExtractor;
final QueryService queryService;
final PathNaming pathNaming;
final KeyLookupAnalyzer keyLookupAnalyzer;
private Session(Class<?> entityType, GeodeBackend backend) {
this.entityType = Objects.requireNonNull(entityType, "entityType");
GeodeSetup setup = backend.setup;
@SuppressWarnings("unchecked")
Region<Object, Object> region = (Region<Object, Object>) setup.regionResolver().resolve(entityType);
this.region = region;
KeyExtractor keyExtractor = setup.keyExtractorFactory().create(entityType);
if (!keyExtractor.metadata().isKeyDefined()) {
throw new IllegalArgumentException(String.format("Key on %s is required for %s", entityType, GeodeBackend.class.getSimpleName()));
}
this.keyExtractor = keyExtractor;
this.queryService = setup.queryServiceResolver().resolve(region);
this.pathNaming = backend.pathNaming;
this.keyLookupAnalyzer = KeyLookupAnalyzer.fromExtractor(keyExtractor);
}
@Override
public Class<?> entityType() {
return entityType;
}
@Override
public Result execute(Operation operation) {
return DefaultResult.of(Flowable.defer(() -> executeInternal(operation)));
}
private Publisher<?> executeInternal(Operation operation) {
if (operation instanceof StandardOperations.Select) {
return Flowable.fromCallable(new SyncSelect(this, (StandardOperations.Select) operation)).flatMapIterable(x -> x);
} else if (operation instanceof StandardOperations.Update) {
return Flowable.fromCallable(new SyncUpdate(this, (StandardOperations.Update) operation));
} else if (operation instanceof StandardOperations.Insert) {
return Flowable.fromCallable(new SyncInsert(this, (StandardOperations.Insert) operation));
} else if (operation instanceof StandardOperations.Delete) {
return Flowable.fromCallable(new SyncDelete(this, (StandardOperations.Delete) operation));
} else if (operation instanceof StandardOperations.Watch) {
return watch((StandardOperations.Watch) operation);
} else if (operation instanceof StandardOperations.DeleteByKey) {
return Flowable.fromCallable(new SyncDeleteByKey(this, (StandardOperations.DeleteByKey) operation));
} else if (operation instanceof StandardOperations.GetByKey) {
return Flowable.fromCallable(new SyncGetByKey(this, (StandardOperations.GetByKey) operation)).flatMapIterable(x -> x);
}
return Flowable.error(new UnsupportedOperationException(String.format("Operation %s not supported by %s",
operation, GeodeBackend.class.getSimpleName())));
}
private <T> Publisher<WatchEvent<T>> watch(StandardOperations.Watch operation) {
return Flowable.create(e -> {
final FlowableEmitter<WatchEvent<T>> emitter = e.serialize();
final String oql = oqlGenerator().withoutBindVariables().generate(operation.query()).oql();
final CqAttributesFactory factory = new CqAttributesFactory();
factory.addCqListener(new GeodeEventListener<>(oql, emitter));
final CqQuery cqQuery = queryService.newCq(oql, factory.create());
emitter.setDisposable(new CqDisposable(cqQuery));
cqQuery.execute();
}, BackpressureStrategy.ERROR);
}
OqlGenerator oqlGenerator() {
return OqlGenerator.of(region.getFullPath(), pathNaming);
}
}
}