| /* |
| * 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.sling.distribution.journal.impl.subscriber; |
| |
| import java.io.Closeable; |
| import java.util.Objects; |
| import java.util.Set; |
| import java.util.concurrent.Executors; |
| import java.util.concurrent.ScheduledExecutorService; |
| import java.util.concurrent.TimeUnit; |
| import java.util.function.Consumer; |
| |
| import javax.annotation.ParametersAreNonnullByDefault; |
| |
| import org.apache.sling.distribution.journal.messages.Messages; |
| import org.apache.sling.distribution.journal.messages.Messages.DiscoveryMessage; |
| import org.apache.sling.distribution.journal.messages.Messages.SubscriberConfiguration; |
| import org.apache.sling.distribution.journal.messages.Messages.SubscriberState; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| @ParametersAreNonnullByDefault |
| class Announcer implements Runnable, Closeable { |
| |
| private static final Logger LOG = LoggerFactory.getLogger(Announcer.class); |
| |
| private final BookKeeper bookKeeper; |
| |
| private final Consumer<DiscoveryMessage> sender; |
| |
| private final String subSlingId; |
| |
| private final String subAgentName; |
| |
| private final Set<String> pubAgentNames; |
| |
| private final boolean editable; |
| |
| private final int maxRetries; |
| |
| private final ScheduledExecutorService executor; |
| |
| public Announcer(String subSlingId, |
| String subAgentName, |
| Set<String> pubAgentNames, |
| Consumer<DiscoveryMessage> disSender, |
| BookKeeper bookKeeper, |
| int maxRetries, |
| boolean editable, |
| int announceDelay) { |
| this.subSlingId = Objects.requireNonNull(subSlingId); |
| this.subAgentName = Objects.requireNonNull(subAgentName); |
| this.pubAgentNames = Objects.requireNonNull(pubAgentNames); |
| this.sender = Objects.requireNonNull(disSender); |
| this.bookKeeper = Objects.requireNonNull(bookKeeper); |
| this.maxRetries = maxRetries; |
| this.editable = editable; |
| executor = Executors.newSingleThreadScheduledExecutor(); |
| executor.scheduleAtFixedRate(this, 0, announceDelay, TimeUnit.MILLISECONDS); |
| } |
| |
| @Override |
| public void run() { |
| LOG.debug("Sending discovery message for agent {}", subAgentName); |
| try { |
| DiscoveryMessage msg = createDiscoveryMessage(); |
| sender.accept(msg); |
| } catch (Exception e) { |
| LOG.info("Failed to send discovery message for agent {}, {}", subAgentName, e.getMessage(), e); |
| } |
| } |
| |
| private DiscoveryMessage createDiscoveryMessage() { |
| long offset = bookKeeper.loadOffset(); |
| SubscriberConfiguration subscriberConfiguration = SubscriberConfiguration.newBuilder() |
| .setEditable(editable) |
| .setMaxRetries(maxRetries) |
| .build(); |
| DiscoveryMessage.Builder disMsgBuilder = DiscoveryMessage |
| .newBuilder() |
| .setSubSlingId(subSlingId) |
| .setSubAgentName(subAgentName) |
| .setSubscriberConfiguration(subscriberConfiguration); |
| for (String pubAgentName : pubAgentNames) { |
| disMsgBuilder.addSubscriberState(subscriberState(pubAgentName, offset)); |
| } |
| return disMsgBuilder.build(); |
| } |
| |
| private SubscriberState subscriberState(String pubAgentName, long offset) { |
| int retries = bookKeeper.getRetries(pubAgentName); |
| return Messages.SubscriberState.newBuilder() |
| .setPubAgentName(pubAgentName) |
| .setRetries(retries) |
| .setOffset(offset) |
| .build(); |
| } |
| |
| @Override |
| public void close() { |
| executor.shutdown(); |
| } |
| } |