Github user shawnfeldman commented on a diff in the pull request:
https://github.com/apache/incubator-usergrid/pull/255#discussion_r31182808
--- Diff:
stack/core/src/main/java/org/apache/usergrid/corepersistence/asyncevents/AmazonAsyncEventService.java
---
@@ -0,0 +1,425 @@
+/*
+ * 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.usergrid.corepersistence.asyncevents;
+
+
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.concurrent.atomic.AtomicLong;
+
+import com.google.common.base.Preconditions;
+import org.apache.usergrid.corepersistence.CpEntityManager;
+import org.apache.usergrid.corepersistence.asyncevents.model.*;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import org.apache.usergrid.corepersistence.index.EntityIndexOperation;
+import org.apache.usergrid.corepersistence.index.IndexProcessorFig;
+import org.apache.usergrid.corepersistence.index.IndexService;
+import org.apache.usergrid.persistence.collection.EntityCollectionManager;
+import
org.apache.usergrid.persistence.collection.EntityCollectionManagerFactory;
+import
org.apache.usergrid.persistence.collection.serialization.impl.migration.EntityIdScope;
+import org.apache.usergrid.persistence.core.metrics.MetricsFactory;
+import org.apache.usergrid.persistence.core.rx.RxTaskScheduler;
+import org.apache.usergrid.persistence.core.scope.ApplicationScope;
+import org.apache.usergrid.persistence.graph.Edge;
+import org.apache.usergrid.persistence.model.entity.Entity;
+import org.apache.usergrid.persistence.model.entity.Id;
+import org.apache.usergrid.persistence.queue.QueueManager;
+import org.apache.usergrid.persistence.queue.QueueManagerFactory;
+import org.apache.usergrid.persistence.queue.QueueMessage;
+import org.apache.usergrid.persistence.queue.QueueScope;
+import org.apache.usergrid.persistence.queue.impl.QueueScopeImpl;
+
+import com.codahale.metrics.Counter;
+import com.codahale.metrics.Gauge;
+import com.codahale.metrics.Timer;
+import com.google.inject.Inject;
+import com.google.inject.Singleton;
+
+import rx.Observable;
+import rx.Subscriber;
+import rx.Subscription;
+import rx.schedulers.Schedulers;
+
+
+@Singleton
+public class AmazonAsyncEventService implements AsyncEventService {
+
+
+ private static final Logger logger =
LoggerFactory.getLogger(AmazonAsyncEventService.class);
+ private static final int MAX_TAKE = 10;
+ private static final String QUEUE_NAME = "es_queue";
+
+ private final QueueManager queue;
+ private final IndexProcessorFig indexProcessorFig;
+ private final IndexService indexService;
+ private final EntityCollectionManagerFactory
entityCollectionManagerFactory;
+ private final RxTaskScheduler rxTaskScheduler;
+
+ private final Timer readTimer;
+ private final Timer writeTimer;
+ private final Timer messageProcessingTimer;
+
+ private final Object mutex = new Object();
+
+ private final Counter indexErrorCounter;
+ private final AtomicLong counter = new AtomicLong();
+ private final AtomicLong inFlight = new AtomicLong();
+
+ //the actively running subscription
+ private List<Subscription> subscriptions = new ArrayList<>();
+
+
+ @Inject
+ public AmazonAsyncEventService(final QueueManagerFactory
queueManagerFactory,
+ final IndexProcessorFig
indexProcessorFig,
+ final MetricsFactory metricsFactory,
+ final IndexService indexService,
+ final EntityCollectionManagerFactory
entityCollectionManagerFactory,
+ final RxTaskScheduler rxTaskScheduler) {
+
+ this.indexService = indexService;
+ this.entityCollectionManagerFactory =
entityCollectionManagerFactory;
+ this.rxTaskScheduler = rxTaskScheduler;
+
+ final QueueScope queueScope = new QueueScopeImpl(QUEUE_NAME);
+ this.queue = queueManagerFactory.getQueueManager(queueScope);
+ this.indexProcessorFig = indexProcessorFig;
+
+ this.writeTimer =
metricsFactory.getTimer(AmazonAsyncEventService.class, "write");
+ this.readTimer =
metricsFactory.getTimer(AmazonAsyncEventService.class, "read");
+ this.messageProcessingTimer =
metricsFactory.getTimer(AmazonAsyncEventService.class, "message.processing");
+ this.indexErrorCounter =
metricsFactory.getCounter(AmazonAsyncEventService.class, "error");
+
+
+ //wire up the gauge of inflight message
+ metricsFactory.addGauge(AmazonAsyncEventService.class,
"inflight.meter", new Gauge<Long>() {
+ @Override
+ public Long getValue() {
+ return inFlight.longValue();
+ }
+ });
+
+ start();
+ }
+
+
+ /**
+ * Offer the EntityIdScope to SQS
+ */
+ private void offer(final Object operation) {
+ final Timer.Context timer = this.writeTimer.time();
+
+ try {
+ //signal to SQS
+ this.queue.sendMessage(operation);
+ } catch (IOException e) {
+ throw new RuntimeException("Unable to queue message", e);
+ } finally {
+ timer.stop();
+ }
+ }
+
+
+ /**
+ * Take message from SQS
+ */
+ public List<QueueMessage> take() {
--- End diff --
should be Observable<QueueMessage>
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