/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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
 * <p/>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p/>
 * 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 storm.trident.windowing;

import storm.trident.state.State;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * {@code State} implementation for windowing operation. This is mainly used to get callback of commit txId of batches
 * in which triggers are emitted.
 */
public class WindowsState implements State {
    private static final Logger LOG = LoggerFactory.getLogger(WindowsState.class);

    private Long currentTxId;

    public WindowsState() {
    }

    @Override
    public void beginCommit(Long txId) {
        currentTxId = txId;
        LOG.debug(" WindowsState.beginCommit:: [{}] ", txId);
    }

    @Override
    public void commit(Long txId) {
        LOG.debug("WindowsState.commit :: [{}]", txId);
    }

    public Long getCurrentTxId() {
        return currentTxId;
    }
}