| /* |
| * 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 |
| * |
| * 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 org.apache.ignite.internal.processors.platform.cache.query; |
| |
| import java.io.Externalizable; |
| import java.io.IOException; |
| import java.io.ObjectInput; |
| import java.io.ObjectOutput; |
| import java.util.concurrent.locks.ReadWriteLock; |
| import java.util.concurrent.locks.ReentrantReadWriteLock; |
| import javax.cache.event.CacheEntryEvent; |
| import javax.cache.event.CacheEntryListenerException; |
| import org.apache.ignite.Ignite; |
| import org.apache.ignite.internal.binary.BinaryRawWriterEx; |
| import org.apache.ignite.internal.processors.platform.PlatformContext; |
| import org.apache.ignite.internal.processors.platform.memory.PlatformMemory; |
| import org.apache.ignite.internal.processors.platform.memory.PlatformOutputStream; |
| import org.apache.ignite.internal.processors.platform.utils.PlatformUtils; |
| import org.apache.ignite.internal.util.typedef.internal.S; |
| import org.apache.ignite.resources.IgniteInstanceResource; |
| |
| /** |
| * Continuous query filter deployed on remote nodes. |
| */ |
| public class PlatformContinuousQueryRemoteFilter implements PlatformContinuousQueryFilter, Externalizable { |
| /** */ |
| private static final long serialVersionUID = 0L; |
| |
| /** Lock for concurrency control. */ |
| private final ReadWriteLock lock = new ReentrantReadWriteLock(); |
| |
| /** Native filter in serialized form. */ |
| private Object filter; |
| |
| /** Grid hosting the filter. */ |
| @IgniteInstanceResource |
| private transient Ignite grid; |
| |
| /** Native platform pointer. */ |
| private transient volatile long ptr; |
| |
| /** Close flag. Once set, none requests to native platform is possible. */ |
| private transient boolean closed; |
| |
| /** |
| * {@link java.io.Externalizable} support. |
| */ |
| public PlatformContinuousQueryRemoteFilter() { |
| // No-op. |
| } |
| |
| /** |
| * Constructor. |
| * |
| * @param filter Serialized native filter. |
| */ |
| public PlatformContinuousQueryRemoteFilter(Object filter) { |
| assert filter != null; |
| |
| this.filter = filter; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override public boolean evaluate(CacheEntryEvent evt) throws CacheEntryListenerException { |
| long ptr0 = ptr; |
| |
| if (ptr0 == 0) |
| deploy(); |
| |
| lock.readLock().lock(); |
| |
| try { |
| if (closed) |
| throw new CacheEntryListenerException("Failed to evaluate the filter because it has been closed."); |
| |
| PlatformContext platformCtx = PlatformUtils.platformContext(grid); |
| |
| return PlatformUtils.evaluateContinuousQueryEvent(platformCtx, ptr, evt); |
| } |
| finally { |
| lock.readLock().unlock(); |
| } |
| } |
| |
| /** |
| * Deploy filter to native platform. |
| */ |
| private void deploy() { |
| lock.writeLock().lock(); |
| |
| try { |
| // 1. Do not deploy if the filter has been closed concurrently. |
| if (closed) |
| throw new CacheEntryListenerException("Failed to deploy the filter because it has been closed."); |
| |
| // 2. Deploy. |
| PlatformContext ctx = PlatformUtils.platformContext(grid); |
| |
| try (PlatformMemory mem = ctx.memory().allocate()) { |
| PlatformOutputStream out = mem.output(); |
| |
| BinaryRawWriterEx writer = ctx.writer(out); |
| |
| writer.writeObject(filter); |
| |
| out.synchronize(); |
| |
| ptr = ctx.gateway().continuousQueryFilterCreate(mem.pointer()); |
| } |
| catch (Exception e) { |
| // 3. Close in case of failure. |
| close(); |
| |
| throw new CacheEntryListenerException("Failed to deploy the filter.", e); |
| } |
| } |
| finally { |
| lock.writeLock().unlock(); |
| } |
| } |
| |
| /** {@inheritDoc} */ |
| @Override public void onQueryUnregister() { |
| lock.writeLock().lock(); |
| |
| try { |
| close(); |
| } |
| finally { |
| lock.writeLock().unlock(); |
| } |
| } |
| |
| /** |
| * Close the filter. |
| */ |
| private void close() { |
| if (!closed) { |
| try { |
| if (ptr != 0) { |
| try { |
| PlatformUtils.platformContext(grid).gateway().continuousQueryFilterRelease(ptr); |
| } |
| finally { |
| // Nullify the pointer in any case. |
| ptr = 0; |
| } |
| } |
| } |
| finally { |
| closed = true; |
| } |
| } |
| } |
| |
| /** {@inheritDoc} */ |
| @Override public void writeExternal(ObjectOutput out) throws IOException { |
| out.writeObject(filter); |
| } |
| |
| /** {@inheritDoc} */ |
| @Override public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException { |
| filter = in.readObject(); |
| |
| assert filter != null; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override public String toString() { |
| return S.toString(PlatformContinuousQueryRemoteFilter.class, this); |
| } |
| } |