| /* |
| * 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.bookkeeper.clients.impl.container; |
| |
| import com.google.common.annotations.VisibleForTesting; |
| import com.google.common.collect.Lists; |
| import java.util.List; |
| import java.util.concurrent.CompletableFuture; |
| import java.util.concurrent.ScheduledExecutorService; |
| import java.util.concurrent.TimeUnit; |
| import javax.annotation.concurrent.GuardedBy; |
| import lombok.extern.slf4j.Slf4j; |
| import org.apache.bookkeeper.clients.exceptions.StorageContainerException; |
| import org.apache.bookkeeper.clients.impl.channel.StorageServerChannel; |
| import org.apache.bookkeeper.clients.impl.channel.StorageServerChannelManager; |
| import org.apache.bookkeeper.clients.impl.internal.api.LocationClient; |
| import org.apache.bookkeeper.clients.utils.ClientConstants; |
| import org.apache.bookkeeper.common.concurrent.FutureUtils; |
| import org.apache.bookkeeper.common.exceptions.ObjectClosedException; |
| import org.apache.bookkeeper.common.util.IRevisioned; |
| import org.apache.bookkeeper.common.util.Revisioned; |
| import org.apache.bookkeeper.stream.proto.common.Endpoint; |
| import org.apache.bookkeeper.stream.proto.storage.OneStorageContainerEndpointResponse; |
| import org.apache.bookkeeper.stream.proto.storage.StatusCode; |
| import org.apache.bookkeeper.stream.proto.storage.StorageContainerEndpoint; |
| |
| /** |
| * A client place holder for managing information of storage containers. |
| */ |
| @Slf4j |
| public class StorageContainerChannel { |
| |
| private final long scId; |
| private final StorageServerChannelManager channelManager; |
| private final LocationClient locationClient; |
| private final ScheduledExecutorService executor; |
| |
| @GuardedBy("this") |
| private StorageContainerInfo scInfo = null; |
| @GuardedBy("this") |
| private CompletableFuture<StorageServerChannel> rsChannelFuture = null; |
| |
| public StorageContainerChannel(long scId, |
| StorageServerChannelManager channelManager, |
| LocationClient locationClient, |
| ScheduledExecutorService executor) { |
| this.scId = scId; |
| this.channelManager = channelManager; |
| this.locationClient = locationClient; |
| this.executor = executor; |
| } |
| |
| public long getStorageContainerId() { |
| return this.scId; |
| } |
| |
| public synchronized StorageContainerInfo getStorageContainerInfo() { |
| return scInfo; |
| } |
| |
| public synchronized CompletableFuture<StorageServerChannel> getStorageServerChannelFuture() { |
| return rsChannelFuture; |
| } |
| |
| public synchronized void resetStorageServerChannelFuture() { |
| rsChannelFuture = null; |
| } |
| |
| public synchronized boolean resetStorageServerChannelFuture(CompletableFuture<StorageServerChannel> oldFuture) { |
| if (oldFuture != null) { |
| // we only reset the channel that we expect to reset |
| if (rsChannelFuture == oldFuture) { |
| rsChannelFuture = null; |
| return true; |
| } else { |
| return false; |
| } |
| } else { |
| rsChannelFuture = null; |
| return true; |
| } |
| } |
| |
| @VisibleForTesting |
| public synchronized void setStorageServerChannelFuture(CompletableFuture<StorageServerChannel> rsChannelFuture) { |
| this.rsChannelFuture = rsChannelFuture; |
| } |
| |
| public CompletableFuture<StorageServerChannel> getStorageContainerChannelFuture() { |
| CompletableFuture<StorageServerChannel> channelFuture; |
| synchronized (this) { |
| if (null != rsChannelFuture) { |
| return rsChannelFuture; |
| } |
| channelFuture = rsChannelFuture = FutureUtils.createFuture(); |
| } |
| fetchStorageContainerInfo(); |
| return channelFuture; |
| } |
| |
| /** |
| * Retrieve the latest storage container info. |
| */ |
| private void fetchStorageContainerInfo() { |
| long scRevision; |
| synchronized (this) { |
| if (null == scInfo) { |
| scRevision = IRevisioned.ANY_REVISION; |
| } else { |
| scRevision = scInfo.getRevision(); |
| } |
| } |
| Revisioned<Long> groupId = Revisioned.of(scId, scRevision); |
| this.locationClient |
| .locateStorageContainers(Lists.newArrayList(groupId)) |
| .whenCompleteAsync((scEndpoints, cause) -> { |
| if (null != cause) { |
| handleFetchStorageContainerInfoFailure(cause); |
| return; |
| } |
| handleFetchStorageContainerInfoSuccess(scEndpoints); |
| }, executor); |
| } |
| |
| private void handleFetchStorageContainerInfoFailure(Throwable cause) { |
| log.info("Failed to fetch info of storage container ({}) - '{}'. Retry in {} ms ...", |
| new Object[]{scId, cause.getMessage(), ClientConstants.DEFAULT_BACKOFF_START_MS}); |
| executor.schedule(() -> { |
| fetchStorageContainerInfo(); |
| }, ClientConstants.DEFAULT_BACKOFF_START_MS, TimeUnit.MILLISECONDS); |
| } |
| |
| private void handleFetchStorageContainerInfoSuccess( |
| List<OneStorageContainerEndpointResponse> storageContainerEndpoints) { |
| if (storageContainerEndpoints.size() != 1) { |
| handleFetchStorageContainerInfoFailure(new Exception( |
| "Expected only one storage container endpoint. But found " + storageContainerEndpoints.size() |
| + " storage container endpoints.")); |
| return; |
| } |
| OneStorageContainerEndpointResponse response = storageContainerEndpoints.get(0); |
| if (StatusCode.SUCCESS != response.getStatusCode()) { |
| handleFetchStorageContainerInfoFailure( |
| new StorageContainerException(response.getStatusCode(), |
| "fail to fetch location for storage container (" + scId + ")")); |
| return; |
| } |
| StorageContainerEndpoint endpoint = response.getEndpoint(); |
| if (null != scInfo && scInfo.getRevision() >= endpoint.getRevision()) { |
| handleFetchStorageContainerInfoFailure( |
| new StorageContainerException(StatusCode.STALE_GROUP_INFO, |
| "Fetched a stale storage container info : current = " + scInfo.getRevision() |
| + ", fetched = " + endpoint.getRevision() + "")); |
| return; |
| } |
| // we got the updated location |
| List<Endpoint> readEndpoints = |
| Lists.newArrayListWithExpectedSize(1 + endpoint.getRoEndpointCount()); |
| readEndpoints.add(endpoint.getRwEndpoint()); |
| readEndpoints.addAll(endpoint.getRoEndpointList()); |
| scInfo = StorageContainerInfo.of( |
| scId, |
| endpoint.getRevision(), |
| endpoint.getRwEndpoint(), |
| readEndpoints); |
| // get the channel from channel manager (if it doesn't exist create one) |
| StorageServerChannel serverChannel = channelManager.getOrCreateChannel(endpoint.getRwEndpoint()); |
| if (null == serverChannel) { |
| log.info("No channel found/created for range server {}. The channel manager must be shutting down." |
| + " Stop the process of fetching storage container ({}).", endpoint.getRwEndpoint(), scId); |
| synchronized (this) { |
| rsChannelFuture.completeExceptionally( |
| new ObjectClosedException("StorageServerChannelManager is closed")); |
| } |
| return; |
| } |
| |
| // intercept the storage server channel with additional sc metadata |
| StorageServerChannel interceptedChannel = serverChannel.intercept(scId); |
| |
| // update the future |
| synchronized (this) { |
| rsChannelFuture.complete(interceptedChannel); |
| } |
| } |
| |
| } |