/*
* Copyright 1999-2015 dangdang.com.
* <p>
* 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.
* </p>
*/
package com.dangdang.ddframe.rdb.transaction.soft.storage.impl;
import com.dangdang.ddframe.rdb.transaction.soft.constants.SoftTransactionType;
import com.dangdang.ddframe.rdb.transaction.soft.storage.TransactionLog;
import com.dangdang.ddframe.rdb.transaction.soft.storage.TransactionLogStorage;
import lombok.RequiredArgsConstructor;
import java.sql.Connection;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.atomic.AtomicInteger;
/**
* 基于内存的事务日志存储器接口.
*
* @author zhangliang
*/
@RequiredArgsConstructor
public final class MemoryTransactionLogStorage implements TransactionLogStorage {
private static final ConcurrentHashMap<String, TransactionLog> DATA = new ConcurrentHashMap<>();
@Override
public void add(final TransactionLog transactionLog) {
DATA.putIfAbsent(transactionLog.getId(), transactionLog);
}
@Override
public void remove(final String id) {
DATA.remove(id);
}
@Override
public List<TransactionLog> findEligibleTransactionLogs(final int size, final int maxDeliveryTryTimes, final long maxDeliveryTryDelayMillis) {
List<TransactionLog> result = new ArrayList<>();
int count = 0;
for (TransactionLog each : DATA.values()) {
if (count >= size) {
break;
}
if (each.getAsyncDeliveryTryTimes() < maxDeliveryTryTimes
&& SoftTransactionType.BestEffortsDelivery == each.getTransactionType()
&& each.getCreationTime() < System.currentTimeMillis() - maxDeliveryTryDelayMillis) {
result.add(each);
}
count++;
}
return result;
}
@Override
public void increaseAsyncDeliveryTryTimes(final String id) {
if (DATA.containsKey(id)) {
TransactionLog transactionLog = DATA.get(id);
transactionLog.setAsyncDeliveryTryTimes(new AtomicInteger(transactionLog.getAsyncDeliveryTryTimes()).incrementAndGet());
DATA.put(id, transactionLog);
}
}
@Override
public boolean processData(final Connection connection, final TransactionLog transactionLog, final int maxDeliveryTryTimes) {
return false;
}
}