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/*
* Copyright 2008-2012 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.map;
import java.util.concurrent.atomic.AtomicReference;
import java.util.concurrent.TimeUnit;
import com.amazon.carbonado.Repository;
import com.amazon.carbonado.RepositoryException;
import com.amazon.carbonado.repo.indexed.IndexedRepositoryBuilder;
import com.amazon.carbonado.spi.AbstractRepositoryBuilder;
/**
* Volatile repository implementation backed by a concurrent map. Locks used by
* repository are coarse, much like <i>table locks</i>. Loads and queries
* acquire read locks, and modifications acquire write locks. Within
* transactions, loads and queries always acquire upgradable locks, to reduce
* the likelihood of deadlock.
*
* <p>This repository supports transactions, which also may be
* nested. Supported isolation levels are read committed and serializable. Read
* uncommitted is promoted to read committed, and repeatable read is promoted
* to serializable.
*
* <p>
* The following extra capabilities are supported:
* <ul>
* <li>{@link com.amazon.carbonado.capability.IndexInfoCapability IndexInfoCapability}
* <li>{@link com.amazon.carbonado.capability.ShutdownCapability ShutdownCapability}
* <li>{@link com.amazon.carbonado.sequence.SequenceCapability SequenceCapability}
* </ul>
*
* <p>Note: This repository uses concurrent navigable map classes, which became
* available in JDK1.6.
*
* @author Brian S O'Neill
* @since 1.2
*/
public class MapRepositoryBuilder extends AbstractRepositoryBuilder {
/**
* Convenience method to build a new MapRepository.
*/
public static Repository newRepository() {
try {
MapRepositoryBuilder builder = new MapRepositoryBuilder();
return builder.build();
} catch (RepositoryException e) {
// Not expected.
throw new RuntimeException(e);
}
}
private String mName = "";
private boolean mIsMaster = true;
private boolean mIndexSupport = true;
private int mLockTimeout;
private TimeUnit mLockTimeoutUnit;
public MapRepositoryBuilder() {
setLockTimeoutMillis(500);
}
public Repository build(AtomicReference<Repository> rootRef) throws RepositoryException {
if (mIndexSupport) {
// Temporarily set to false to avoid infinite recursion.
mIndexSupport = false;
try {
IndexedRepositoryBuilder ixBuilder = new IndexedRepositoryBuilder();
ixBuilder.setWrappedRepository(this);
ixBuilder.setMaster(isMaster());
ixBuilder.setAllClustered(true);
return ixBuilder.build(rootRef);
} finally {
mIndexSupport = true;
}
}
assertReady();
Repository repo = new MapRepository(rootRef, this);
rootRef.set(repo);
return repo;
}
public String getName() {
return mName;
}
public void setName(String name) {
mName = name;
}
public boolean isMaster() {
return mIsMaster;
}
public void setMaster(boolean b) {
mIsMaster = b;
}
/**
* Set the lock timeout, in milliseconds. Default value is 500 milliseconds.
*/
public void setLockTimeoutMillis(int timeout) {
setLockTimeout(timeout, TimeUnit.MILLISECONDS);
}
/**
* Set the lock timeout. Default value is 500 milliseconds.
*/
public void setLockTimeout(int timeout, TimeUnit unit) {
if (timeout < 0 || unit == null) {
throw new IllegalArgumentException();
}
mLockTimeout = timeout;
mLockTimeoutUnit = unit;
}
/**
* Returns the lock timeout. Call getLockTimeoutUnit to get the unit.
*/
public int getLockTimeout() {
return mLockTimeout;
}
/**
* Returns the lock timeout unit. Call getLockTimeout to get the timeout.
*/
public TimeUnit getLockTimeoutUnit() {
return mLockTimeoutUnit;
}
}
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