001/* 002 * Trident - A Multithreaded Server Alternative 003 * Copyright 2014 The TridentSDK Team 004 * 005 * Licensed under the Apache License, Version 2.0 (the "License"); 006 * you may not use this file except in compliance with the License. 007 * You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017package net.tridentsdk.server.service; 018 019import com.google.common.collect.ForwardingCollection; 020import com.google.common.collect.Lists; 021import net.tridentsdk.Trident; 022import net.tridentsdk.service.Transaction; 023import net.tridentsdk.service.Transactions; 024import net.tridentsdk.util.TridentLogger; 025 026import java.util.Collection; 027import java.util.List; 028import java.util.concurrent.ConcurrentHashMap; 029import java.util.concurrent.ConcurrentMap; 030import java.util.concurrent.atomic.AtomicInteger; 031 032/** 033 * Performs API transactions 034 * 035 * @author The TridentSDK Team 036 */ 037public class TransactionHandler extends ForwardingCollection<Transaction> implements Transactions { 038 private final ConcurrentMap<Object, TransactionAudit> transactions = new ConcurrentHashMap<>(); 039 private final AtomicInteger transactionIds = new AtomicInteger(2); 040 041 /** 042 * Do not instantiate. 043 * <p> 044 * <p>To access this handler, use this code: 045 * <pre><code> 046 * Transactions handler = Registered.transactions(); 047 * </code></pre></p> 048 */ 049 public TransactionHandler() { 050 if (!Trident.isTrident()) 051 TridentLogger.get().error(new IllegalAccessException("This class should only be instantiated by Trident")); 052 } 053 054 @Override 055 public int newAcount() { 056 return transactionIds.incrementAndGet(); 057 } 058 059 @Override 060 public int globalEconomy() { 061 return 1; 062 } 063 064 @Override 065 public int globalExchange() { 066 return 2; 067 } 068 069 @Override 070 public void deposit(int account, Transaction transaction) { 071 TransactionAudit audit = transactions.computeIfAbsent(transaction.receiver(), (k) -> new TransactionAudit()); 072 073 audit.put(account, transaction); 074 transaction.doTransaction(Transaction.Type.DEPOSIT); 075 } 076 077 @Override 078 public boolean withdraw(int account, final Transaction transaction) { 079 TransactionAudit audit = transactions.get(transaction.sender()); 080 if (audit == null) 081 return false; 082 083 Transaction withdrawl = 084 new Transaction( 085 transaction.item(), 086 transaction.sender(), 087 transaction.receiver(), 088 -Math.abs(transaction.amount())) { 089 @Override 090 public void doTransaction(Type type) { 091 transaction.doTransaction(type); 092 } 093 }; 094 095 audit.put(account, withdrawl); 096 withdrawl.doTransaction(Transaction.Type.WITHDRAW); 097 return true; 098 } 099 100 @Override 101 public int amount(int account, Object person, Object type) { 102 TransactionAudit audit = transactions.get(person); 103 if (audit == null) 104 return Integer.MIN_VALUE; 105 106 List<Transaction> queue = audit.transactionsFor(account); 107 if (queue == null) 108 return Integer.MAX_VALUE; 109 110 int amount = 0; 111 for (Transaction transaction : queue) { 112 if (type.equals(transaction.item())) { 113 amount += transaction.amount(); 114 } 115 } 116 117 return amount; 118 } 119 120 @Override 121 protected Collection<Transaction> delegate() { 122 List<Transaction> transactions = Lists.newArrayList(); 123 this.transactions.values().forEach(transactionAudit -> transactions.addAll(transactionAudit.concat())); 124 return transactions; 125 } 126}