/*
* Copyright 2012-2014 Continuuity, Inc.
*
* 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.continuuity.tephra.inmemory;
import com.continuuity.tephra.Transaction;
import com.continuuity.tephra.TransactionCouldNotTakeSnapshotException;
import com.continuuity.tephra.TransactionManager;
import com.continuuity.tephra.TransactionNotInProgressException;
import com.continuuity.tephra.TransactionSystemClient;
import com.continuuity.tephra.TxConstants;
import com.google.inject.Inject;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Collection;
/**
*
*/
public class InMemoryTxSystemClient implements TransactionSystemClient {
private static final Logger LOG = LoggerFactory.getLogger(InMemoryTxSystemClient.class);
TransactionManager txManager;
@Inject
public InMemoryTxSystemClient(TransactionManager txmgr) {
txManager = txmgr;
}
@Override
public Transaction startLong() {
return txManager.startLong();
}
@Override
public Transaction startShort() {
return txManager.startShort();
}
@Override
public Transaction startShort(int timeout) {
return txManager.startShort(timeout);
}
@Override
public boolean canCommit(Transaction tx, Collection<byte[]> changeIds) throws TransactionNotInProgressException {
return changeIds.isEmpty() || txManager.canCommit(tx, changeIds);
}
@Override
public boolean commit(Transaction tx) throws TransactionNotInProgressException {
return txManager.commit(tx);
}
@Override
public void abort(Transaction tx) {
txManager.abort(tx);
}
@Override
public boolean invalidate(long tx) {
return txManager.invalidate(tx);
}
@Override
public InputStream getSnapshotInputStream() throws TransactionCouldNotTakeSnapshotException {
try {
ByteArrayOutputStream out = new ByteArrayOutputStream();
try {
boolean snapshotTaken = txManager.takeSnapshot(out);
if (!snapshotTaken) {
throw new TransactionCouldNotTakeSnapshotException("Transaction manager did not take a snapshot.");
}
} finally {
out.close();
}
return new ByteArrayInputStream(out.toByteArray());
} catch (IOException e) {
LOG.error("Snapshot could not be taken", e);
throw new TransactionCouldNotTakeSnapshotException(e.getMessage());
}
}
@Override
public String status() {
return txManager.isRunning() ? TxConstants.STATUS_OK : TxConstants.STATUS_NOTOK;
}
@Override
public void resetState() {
txManager.resetState();
}
}