| /* |
| * 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.drill.exec.rpc.control; |
| |
| import java.util.concurrent.ConcurrentHashMap; |
| import java.util.concurrent.ConcurrentMap; |
| |
| import org.apache.drill.exec.proto.BitControl.FragmentStatus; |
| import org.apache.drill.exec.proto.ExecProtos.FragmentHandle; |
| import org.apache.drill.exec.proto.UserBitShared.QueryId; |
| import org.apache.drill.exec.proto.helper.QueryIdHelper; |
| import org.apache.drill.exec.work.foreman.FragmentStatusListener; |
| import org.apache.drill.exec.work.foreman.ForemanSetupException; |
| import org.apache.drill.exec.work.fragment.FragmentManager; |
| |
| import org.apache.drill.shaded.guava.com.google.common.collect.Maps; |
| |
| public class WorkEventBus { |
| private static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(WorkEventBus.class); |
| private final ConcurrentMap<FragmentHandle, FragmentManager> managers = Maps.newConcurrentMap(); |
| private final ConcurrentMap<QueryId, FragmentStatusListener> listeners = |
| new ConcurrentHashMap<>(16, 0.75f, 16); |
| |
| public void removeFragmentStatusListener(final QueryId queryId) { |
| if (logger.isDebugEnabled()) { |
| logger.debug("Removing fragment status listener for queryId {}.", QueryIdHelper.getQueryId(queryId)); |
| } |
| listeners.remove(queryId); |
| } |
| |
| public void addFragmentStatusListener(final QueryId queryId, final FragmentStatusListener listener) |
| throws ForemanSetupException { |
| if (logger.isDebugEnabled()) { |
| logger.debug("Adding fragment status listener for queryId {}.", QueryIdHelper.getQueryId(queryId)); |
| } |
| final FragmentStatusListener old = listeners.putIfAbsent(queryId, listener); |
| if (old != null) { |
| throw new ForemanSetupException ( |
| "Failure. The provided handle already exists in the listener pool. You need to remove one listener before adding another."); |
| } |
| } |
| |
| public void statusUpdate(final FragmentStatus status) { |
| final FragmentStatusListener listener = listeners.get(status.getHandle().getQueryId()); |
| if (listener == null) { |
| logger.warn("A fragment message arrived but there was no registered listener for that message: {}.", status); |
| } else { |
| listener.statusUpdate(status); |
| } |
| } |
| |
| public void addFragmentManager(final FragmentManager fragmentManager) { |
| if (logger.isDebugEnabled()) { |
| logger.debug("Fragment {} manager created: {}", QueryIdHelper.getQueryIdentifier(fragmentManager.getHandle()), fragmentManager); |
| } |
| final FragmentManager old = managers.putIfAbsent(fragmentManager.getHandle(), fragmentManager); |
| if (old != null) { |
| throw new IllegalStateException( |
| String.format("Manager %s for fragment %s already exists.", old, QueryIdHelper.getQueryIdentifier(fragmentManager.getHandle()))); |
| } |
| } |
| |
| public FragmentManager getFragmentManager(final FragmentHandle handle) { |
| return managers.get(handle); |
| } |
| |
| /** |
| * Optionally cancels and removes fragment manager (for the corresponding the handle) from the work event bus. Currently, used |
| * for fragments waiting on data (root and intermediate). This method can be called multiple times. The manager will be removed |
| * only once (the first call). |
| * @param handle the handle to the fragment |
| * @param cancel |
| * @return if the fragment was found and removed from the event bus |
| */ |
| public boolean removeFragmentManager(final FragmentHandle handle, final boolean cancel) { |
| final FragmentManager manager = managers.remove(handle); |
| if (manager != null) { |
| assert !manager.isCancelled() : String.format("Fragment %s manager %s is already cancelled.", QueryIdHelper.getQueryIdentifier(handle), manager); |
| if (cancel) { |
| manager.cancel(); |
| } |
| if (logger.isDebugEnabled()) { |
| logger.debug("{} fragment {} manager {} from the work bus.", cancel ? "Cancel and removed" : "Removed", |
| QueryIdHelper.getQueryIdentifier(handle), manager); |
| } |
| return true; |
| } else if (logger.isWarnEnabled()) { |
| logger.warn("Fragment {} manager is not found in the work bus.", QueryIdHelper.getQueryIdentifier(handle)); |
| } |
| return false; |
| } |
| } |