yueh
287 lines
9.0 KiB
Java
287 lines
9.0 KiB
Java
/*
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* This file is part of Applied Energistics 2.
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* Copyright (c) 2013 - 2014, AlgorithmX2, All rights reserved.
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*
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* Applied Energistics 2 is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Applied Energistics 2 is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with Applied Energistics 2. If not, see <http://www.gnu.org/licenses/lgpl>.
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*/
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package appeng.me.cache;
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import java.util.Collection;
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import java.util.Deque;
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import java.util.HashMap;
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import java.util.Iterator;
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import java.util.Map;
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import java.util.Map.Entry;
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import javax.annotation.Nonnegative;
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import javax.annotation.Nonnull;
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import javax.annotation.Nullable;
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import com.google.common.collect.ImmutableList;
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import com.google.common.collect.Queues;
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import appeng.api.config.AccessRestriction;
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import appeng.api.config.Actionable;
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import appeng.api.networking.events.MENetworkStorageEvent;
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import appeng.api.networking.security.IActionSource;
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import appeng.api.storage.IMEInventoryHandler;
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import appeng.api.storage.IMEMonitor;
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import appeng.api.storage.IMEMonitorHandlerReceiver;
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import appeng.api.storage.IStorageChannel;
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import appeng.api.storage.data.IAEStack;
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import appeng.api.storage.data.IItemList;
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import appeng.me.storage.ItemWatcher;
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public class NetworkMonitor<T extends IAEStack<T>> implements IMEMonitor<T> {
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@Nonnull
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private static final Deque<NetworkMonitor<?>> GLOBAL_DEPTH = Queues.newArrayDeque();
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@Nonnull
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private final GridStorageCache myGridCache;
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@Nonnull
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private final IStorageChannel<T> myChannel;
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@Nonnull
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private final IItemList<T> cachedList;
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@Nonnull
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private final Map<IMEMonitorHandlerReceiver<T>, Object> listeners;
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private boolean sendEvent = false;
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private boolean hasChanged = false;
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@Nonnegative
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private int localDepthSemaphore = 0;
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public NetworkMonitor(final GridStorageCache cache, final IStorageChannel<T> chan) {
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this.myGridCache = cache;
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this.myChannel = chan;
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this.cachedList = chan.createList();
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this.listeners = new HashMap<>();
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}
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@Override
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public void addListener(final IMEMonitorHandlerReceiver<T> l, final Object verificationToken) {
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this.listeners.put(l, verificationToken);
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}
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@Override
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public boolean canAccept(final T input) {
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return this.getHandler().canAccept(input);
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}
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@Override
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public T extractItems(final T request, final Actionable mode, final IActionSource src) {
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if (mode == Actionable.SIMULATE) {
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return this.getHandler().extractItems(request, mode, src);
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}
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this.localDepthSemaphore++;
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final T leftover = this.getHandler().extractItems(request, mode, src);
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this.localDepthSemaphore--;
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if (this.localDepthSemaphore == 0) {
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this.monitorDifference(request.copy(), leftover, true, src);
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}
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return leftover;
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}
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@Override
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public AccessRestriction getAccess() {
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return this.getHandler().getAccess();
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}
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@Override
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public IItemList<T> getAvailableItems(final IItemList<T> out) {
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return this.getHandler().getAvailableItems(out);
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}
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@Override
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public IStorageChannel<T> getChannel() {
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return this.getHandler().getChannel();
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}
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@Override
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public int getPriority() {
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return this.getHandler().getPriority();
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}
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@Override
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public int getSlot() {
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return this.getHandler().getSlot();
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}
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@Nonnull
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@Override
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public IItemList<T> getStorageList() {
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if (this.hasChanged) {
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this.hasChanged = false;
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this.cachedList.resetStatus();
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return this.getAvailableItems(this.cachedList);
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}
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return this.cachedList;
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}
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@Override
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public T injectItems(final T input, final Actionable mode, final IActionSource src) {
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if (mode == Actionable.SIMULATE) {
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return this.getHandler().injectItems(input, mode, src);
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}
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this.localDepthSemaphore++;
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final T leftover = this.getHandler().injectItems(input, mode, src);
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this.localDepthSemaphore--;
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if (this.localDepthSemaphore == 0) {
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this.monitorDifference(input.copy(), leftover, false, src);
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}
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return leftover;
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}
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@Override
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public boolean isPrioritized(final T input) {
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return this.getHandler().isPrioritized(input);
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}
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@Override
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public void removeListener(final IMEMonitorHandlerReceiver<T> l) {
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this.listeners.remove(l);
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}
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@Override
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public boolean validForPass(final int i) {
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return this.getHandler().validForPass(i);
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}
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@Nullable
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private IMEInventoryHandler<T> getHandler() {
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return this.myGridCache.getInventoryHandler(this.myChannel);
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}
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private Iterator<Entry<IMEMonitorHandlerReceiver<T>, Object>> getListeners() {
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return this.listeners.entrySet().iterator();
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}
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private T monitorDifference(final IAEStack<T> original, final T leftOvers, final boolean extraction,
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final IActionSource src) {
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final T diff = original.copy();
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if (extraction) {
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diff.setStackSize(leftOvers == null ? 0 : -leftOvers.getStackSize());
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} else if (leftOvers != null) {
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diff.decStackSize(leftOvers.getStackSize());
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}
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if (diff.getStackSize() != 0) {
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this.postChangesToListeners(ImmutableList.of(diff), src);
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}
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return leftOvers;
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}
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private void notifyListenersOfChange(final Iterable<T> diff, final IActionSource src) {
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this.hasChanged = true;
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final Iterator<Entry<IMEMonitorHandlerReceiver<T>, Object>> i = this.getListeners();
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while (i.hasNext()) {
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final Entry<IMEMonitorHandlerReceiver<T>, Object> o = i.next();
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final IMEMonitorHandlerReceiver<T> receiver = o.getKey();
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if (receiver.isValid(o.getValue())) {
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receiver.postChange(this, diff, src);
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} else {
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i.remove();
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}
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}
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}
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private void postChangesToListeners(final Iterable<T> changes, final IActionSource src) {
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this.postChange(true, changes, src);
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}
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protected void postChange(final boolean add, final Iterable<T> changes, final IActionSource src) {
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if (this.localDepthSemaphore > 0 || GLOBAL_DEPTH.contains(this)) {
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return;
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}
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GLOBAL_DEPTH.push(this);
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this.localDepthSemaphore++;
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this.sendEvent = true;
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this.notifyListenersOfChange(changes, src);
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for (final T changedItem : changes) {
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T difference = changedItem;
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if (!add && changedItem != null) {
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difference = changedItem.copy();
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difference.setStackSize(-changedItem.getStackSize());
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}
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if (this.myGridCache.getInterestManager().containsKey(changedItem)) {
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final Collection<ItemWatcher> list = this.myGridCache.getInterestManager().get(changedItem);
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if (!list.isEmpty()) {
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IAEStack<T> fullStack = this.getStorageList().findPrecise(changedItem);
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if (fullStack == null) {
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fullStack = changedItem.copy();
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fullStack.setStackSize(0);
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}
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this.myGridCache.getInterestManager().enableTransactions();
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for (final ItemWatcher iw : list) {
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iw.getHost().onStackChange(this.getStorageList(), fullStack, difference, src,
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this.getChannel());
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}
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this.myGridCache.getInterestManager().disableTransactions();
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}
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}
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}
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final NetworkMonitor<?> last = GLOBAL_DEPTH.pop();
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this.localDepthSemaphore--;
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if (last != this) {
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throw new IllegalStateException("Invalid Access to Networked Storage API detected.");
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}
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}
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void forceUpdate() {
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this.hasChanged = true;
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final Iterator<Entry<IMEMonitorHandlerReceiver<T>, Object>> i = this.getListeners();
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while (i.hasNext()) {
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final Entry<IMEMonitorHandlerReceiver<T>, Object> o = i.next();
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final IMEMonitorHandlerReceiver<T> receiver = o.getKey();
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if (receiver.isValid(o.getValue())) {
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receiver.onListUpdate();
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} else {
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i.remove();
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}
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}
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}
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void onTick() {
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if (this.sendEvent) {
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this.sendEvent = false;
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this.myGridCache.getGrid().postEvent(new MENetworkStorageEvent(this, this.myChannel));
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}
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}
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}
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