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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.replicated;
import java.util.Collection;
import java.util.concurrent.atomic.AtomicReference;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import com.amazon.carbonado.ConfigurationException;
import com.amazon.carbonado.Repository;
import com.amazon.carbonado.RepositoryBuilder;
import com.amazon.carbonado.RepositoryException;
import com.amazon.carbonado.TriggerFactory;
import com.amazon.carbonado.spi.AbstractRepositoryBuilder;
import com.amazon.carbonado.spi.BelatedRepositoryCreator;
/**
* Repository builder for the replicated repository.
* <p>
* The following extra capabilities are supported:
* <ul>
* <li>{@link com.amazon.carbonado.capability.ResyncCapability ResyncCapability}
* </ul>
*
* @author Don Schneider
* @author Brian S O'Neill
*/
public class ReplicatedRepositoryBuilder extends AbstractRepositoryBuilder {
static final int DEFAULT_MASTER_TIMEOUT_MILLIS = 15000;
static final int DEFAULT_RETRY_MILLIS = 30000;
private String mName;
private boolean mIsMaster = true;
private RepositoryBuilder mReplicaRepositoryBuilder;
private RepositoryBuilder mMasterRepositoryBuilder;
public ReplicatedRepositoryBuilder() {
}
public Repository build(AtomicReference<Repository> rootRef) throws RepositoryException {
assertReady();
Repository replica, master;
{
boolean originalOption = mReplicaRepositoryBuilder.isMaster();
try {
mReplicaRepositoryBuilder.setMaster(false);
for (TriggerFactory factory : getTriggerFactories()) {
mReplicaRepositoryBuilder.addTriggerFactory(factory);
}
replica = mReplicaRepositoryBuilder.build(rootRef);
} finally {
mReplicaRepositoryBuilder.setMaster(originalOption);
}
}
{
// Create master using BelatedRepositoryCreator such that we can
// start up and read from replica even if master is down.
final boolean originalOption = mMasterRepositoryBuilder.isMaster();
mMasterRepositoryBuilder.setMaster(mIsMaster);
Log log = LogFactory.getLog(ReplicatedRepositoryBuilder.class);
BelatedRepositoryCreator creator = new BelatedRepositoryCreator
(log, mMasterRepositoryBuilder, rootRef, DEFAULT_RETRY_MILLIS) {
@Override
protected void createdNotification(Repository repo) {
// Don't need builder any more so restore it.
mMasterRepositoryBuilder.setMaster(originalOption);
}
};
master = creator.get(DEFAULT_MASTER_TIMEOUT_MILLIS);
}
Repository repo = new ReplicatedRepository(getName(), replica, master);
rootRef.set(repo);
return repo;
}
public String getName() {
String name = mName;
if (name == null) {
if (mReplicaRepositoryBuilder != null && mReplicaRepositoryBuilder.getName() != null) {
name = mReplicaRepositoryBuilder.getName();
} else if (mMasterRepositoryBuilder != null) {
name = mMasterRepositoryBuilder.getName();
}
}
return name;
}
public void setName(String name) {
mName = name;
}
public boolean isMaster() {
return mIsMaster;
}
public void setMaster(boolean b) {
mIsMaster = b;
}
/**
* @return "replica" respository to replicate to.
*/
public RepositoryBuilder getReplicaRepositoryBuilder() {
return mReplicaRepositoryBuilder;
}
/**
* Set "replica" respository to replicate to, which is required. This builder
* automatically sets the master option of the given repository builder to
* false.
*/
public void setReplicaRepositoryBuilder(RepositoryBuilder replicaRepositoryBuilder) {
mReplicaRepositoryBuilder = replicaRepositoryBuilder;
}
/**
* @return "master" respository to replicate from.
*/
public RepositoryBuilder getMasterRepositoryBuilder() {
return mMasterRepositoryBuilder;
}
/**
* Set "master" respository to replicate from, which is required. This
* builder automatically sets the master option of the given repository to
* true.
*/
public void setMasterRepositoryBuilder(RepositoryBuilder masterRepositoryBuilder) {
mMasterRepositoryBuilder = masterRepositoryBuilder;
}
@Override
public void errorCheck(Collection<String> messages) throws ConfigurationException {
super.errorCheck(messages);
if (null == getReplicaRepositoryBuilder()) {
messages.add("replicaRepositoryBuilder missing");
}
if (null == getMasterRepositoryBuilder()) {
messages.add("masterRepositoryBuilder missing");
}
}
}
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