| /* |
| * 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.cassandra.hints; |
| |
| import java.util.concurrent.atomic.AtomicBoolean; |
| |
| import org.apache.cassandra.gms.ApplicationState; |
| import org.apache.cassandra.gms.Gossiper; |
| import org.apache.cassandra.schema.Schema; |
| |
| import static org.apache.cassandra.utils.FBUtilities.getBroadcastAddressAndPort; |
| |
| /** |
| * A simple dispatch trigger that's being run every 10 seconds. |
| * |
| * Goes through all hint stores and schedules for dispatch all the hints for hosts that are: |
| * 1. Not currently scheduled for dispatch, and |
| * 2. Either have some hint files, or an active hint writer, and |
| * 3. Are live, and |
| * 4. Have matching schema versions |
| * |
| * What does triggering a hints store for dispatch mean? |
| * - If there are existing hint files, it means submitting them for dispatch; |
| * - If there is an active writer, closing it, for the next run to pick it up. |
| */ |
| final class HintsDispatchTrigger implements Runnable |
| { |
| private final HintsCatalog catalog; |
| private final HintsWriteExecutor writeExecutor; |
| private final HintsDispatchExecutor dispatchExecutor; |
| private final AtomicBoolean isPaused; |
| |
| HintsDispatchTrigger(HintsCatalog catalog, |
| HintsWriteExecutor writeExecutor, |
| HintsDispatchExecutor dispatchExecutor, |
| AtomicBoolean isPaused) |
| { |
| this.catalog = catalog; |
| this.writeExecutor = writeExecutor; |
| this.dispatchExecutor = dispatchExecutor; |
| this.isPaused = isPaused; |
| } |
| |
| public void run() |
| { |
| if (isPaused.get()) |
| return; |
| |
| catalog.stores() |
| .filter(store -> !isScheduled(store)) |
| .filter(HintsStore::isLive) |
| .filter(store -> store.isWriting() || store.hasFiles()) |
| .filter(store -> Schema.instance.isSameVersion(Gossiper.instance.getSchemaVersion(store.address()))) |
| .forEach(this::schedule); |
| } |
| |
| private void schedule(HintsStore store) |
| { |
| if (store.hasFiles()) |
| dispatchExecutor.dispatch(store); |
| |
| if (store.isWriting()) |
| writeExecutor.closeWriter(store); |
| } |
| |
| private boolean isScheduled(HintsStore store) |
| { |
| return dispatchExecutor.isScheduled(store); |
| } |
| } |