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/*
* Copyright 2006-2012 Amazon Technologies, Inc. or its affiliates.
* Amazon, Amazon.com and Carbonado are trademarks or registered trademarks
* of Amazon Technologies, Inc. or its affiliates. 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.
*/
package com.amazon.carbonado.repo.indexed;
import org.apache.commons.logging.LogFactory;
import com.amazon.carbonado.CorruptEncodingException;
import com.amazon.carbonado.FetchException;
import com.amazon.carbonado.PersistException;
import com.amazon.carbonado.Storable;
import com.amazon.carbonado.Transaction;
import com.amazon.carbonado.Trigger;
import com.amazon.carbonado.UniqueConstraintException;
/**
* Handles index updates.
*
* @author Brian S O'Neill
*/
class IndexesTrigger<S extends Storable> extends Trigger<S> {
private final ManagedIndex<S>[] mManagedIndexes;
/**
* @param managedIndexes all the indexes that need to be updated.
*/
IndexesTrigger(ManagedIndex<S>[] managedIndexes) {
mManagedIndexes = managedIndexes;
}
@Override
public void afterInsert(S storable, Object state) throws PersistException {
for (ManagedIndex<S> managed : mManagedIndexes) {
if (!managed.insertIndexEntry(storable)) {
throw new UniqueConstraintException
("Alternate key constraint: " + storable.toString() +
", " + managed);
}
}
}
@Override
public void afterTryInsert(S storable, Object state) throws PersistException {
for (ManagedIndex<S> managed : mManagedIndexes) {
if (!managed.insertIndexEntry(storable)) {
throw abortTry();
}
}
}
@Override
public Object beforeUpdate(S storable) throws PersistException {
// Return old storable for afterUpdate.
S copy = (S) storable.copy();
try {
if (copy.tryLoad()) {
return copy;
}
} catch (FetchException e) {
throw e.toPersistException();
}
// If this point is reached, then afterUpdate is not called because
// update will fail.
return null;
}
@Override
public void afterUpdate(S storable, Object state) throws PersistException {
// Cast old storable as provided by beforeUpdate.
S oldStorable = (S) state;
for (ManagedIndex<S> managed : mManagedIndexes) {
managed.updateIndexEntry(storable, oldStorable);
}
}
@Override
public Object beforeDelete(S storable) throws PersistException {
// Delete index entries referenced by existing storable.
S copy = (S) storable.copy();
try {
try {
if (!copy.tryLoad()) {
return null;
}
} catch (CorruptEncodingException e) {
LogFactory.getLog(IndexedStorage.class)
.warn("Unable to delete index entries because primary record is corrupt: " +
copy.toStringKeyOnly(), e);
return null;
}
for (ManagedIndex<S> managed : mManagedIndexes) {
managed.deleteIndexEntry(copy);
}
} catch (FetchException e) {
throw e.toPersistException();
}
return null;
}
/**
* Ensure old storable instance is loaded with an upgradable lock, allowing change to
* proceed without deadlock.
*/
final static class Strict<S extends Storable> extends IndexesTrigger<S> {
Strict(ManagedIndex<S>[] managedIndexes) {
super(managedIndexes);
}
@Override
public Object beforeTryUpdate(Transaction txn, S storable) throws PersistException {
return beforeUpdate(txn, storable);
}
@Override
public Object beforeUpdate(Transaction txn, S storable) throws PersistException {
txn.setForUpdate(true);
return super.beforeUpdate(storable);
}
@Override
public Object beforeTryDelete(Transaction txn, S storable) throws PersistException {
return beforeDelete(txn, storable);
}
@Override
public Object beforeDelete(Transaction txn, S storable) throws PersistException {
txn.setForUpdate(true);
return super.beforeDelete(storable);
}
}
}
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