usergrid-commits mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From toddn...@apache.org
Subject [09/10] git commit: adding rx to master
Date Wed, 30 Jul 2014 22:00:25 GMT
adding rx to master


Project: http://git-wip-us.apache.org/repos/asf/incubator-usergrid/repo
Commit: http://git-wip-us.apache.org/repos/asf/incubator-usergrid/commit/b1efc555
Tree: http://git-wip-us.apache.org/repos/asf/incubator-usergrid/tree/b1efc555
Diff: http://git-wip-us.apache.org/repos/asf/incubator-usergrid/diff/b1efc555

Branch: refs/heads/master
Commit: b1efc555a38c86e9d716e53f329d21e36cc17304
Parents: 8e4465d
Author: Shawn Feldman <sfeldman@apache.org>
Authored: Wed Jul 30 14:35:13 2014 -0600
Committer: Shawn Feldman <sfeldman@apache.org>
Committed: Wed Jul 30 14:35:13 2014 -0600

----------------------------------------------------------------------
 stack/core/pom.xml                              | 11 +++
 .../persistence/ObservableIterator.java         | 82 ++++++++++++++++++++
 stack/pom.xml                                   |  1 +
 3 files changed, 94 insertions(+)
----------------------------------------------------------------------


http://git-wip-us.apache.org/repos/asf/incubator-usergrid/blob/b1efc555/stack/core/pom.xml
----------------------------------------------------------------------
diff --git a/stack/core/pom.xml b/stack/core/pom.xml
index c6748aa..d9bc308 100644
--- a/stack/core/pom.xml
+++ b/stack/core/pom.xml
@@ -570,5 +570,16 @@
       <artifactId>metrics-graphite</artifactId>
       <version>${metrics.version}</version>
     </dependency>
+
+    <dependency>
+      <groupId>com.netflix.rxjava</groupId>
+      <artifactId>rxjava-core</artifactId>
+      <version>${rx.version}</version>
+    </dependency>
+    <dependency>
+      <groupId>com.netflix.rxjava</groupId>
+      <artifactId>rxjava-math</artifactId>
+      <version>${rx.version}</version>
+    </dependency>
   </dependencies>
 </project>

http://git-wip-us.apache.org/repos/asf/incubator-usergrid/blob/b1efc555/stack/core/src/main/java/org/apache/usergrid/persistence/ObservableIterator.java
----------------------------------------------------------------------
diff --git a/stack/core/src/main/java/org/apache/usergrid/persistence/ObservableIterator.java
b/stack/core/src/main/java/org/apache/usergrid/persistence/ObservableIterator.java
new file mode 100644
index 0000000..b91bd22
--- /dev/null
+++ b/stack/core/src/main/java/org/apache/usergrid/persistence/ObservableIterator.java
@@ -0,0 +1,82 @@
+/*
+ * 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.persistence;
+
+import com.google.common.base.Preconditions;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import rx.Observable;
+import rx.Subscriber;
+
+import java.util.Iterator;
+
+
+/**
+ * Converts an iterator to an observable.  Subclasses need to only implement getting the
iterator from the data source.
+ * This is used in favor of "Observable.just" when the initial fetch of the iterator will
require I/O.  This allows us
+ * to wrap the iterator in a deferred invocation to avoid the blocking on construction.
+ */
+public abstract class ObservableIterator<T> implements Observable.OnSubscribe<T>
{
+
+    private static final Logger log = LoggerFactory.getLogger(ObservableIterator.class);
+
+    private final String name;
+
+
+    /**
+     * @param name The simple name of the iterator, used for debugging
+     */
+    protected ObservableIterator( final String name ) {this.name = name;}
+
+
+    @Override
+    public void call( final Subscriber<? super T> subscriber ) {
+
+
+        try {
+            //get our iterator and push data to the observer
+            final Iterator<T> itr = getIterator();
+
+            Preconditions.checkNotNull(itr,
+                    "The observable must return an iterator.  Null was returned for iterator
" + name);
+
+
+            //while we have items to emit and our subscriber is subscribed, we want to keep
emitting items
+            while ( itr.hasNext() && !subscriber.isUnsubscribed() ) {
+                final T next = itr.next();
+
+                log.trace( "Iterator '{}' emitting item '{}'", name, next );
+
+                subscriber.onNext( next );
+            }
+
+
+            subscriber.onCompleted();
+        }
+
+        //if any error occurs, we need to notify the observer so it can perform it's own
error handling
+        catch ( Throwable t ) {
+            subscriber.onError( t );
+        }
+    }
+
+
+    /**
+     * Return the iterator to feed data to
+     */
+    protected abstract Iterator<T> getIterator();
+}

http://git-wip-us.apache.org/repos/asf/incubator-usergrid/blob/b1efc555/stack/pom.xml
----------------------------------------------------------------------
diff --git a/stack/pom.xml b/stack/pom.xml
index b58eafb..e16d470 100644
--- a/stack/pom.xml
+++ b/stack/pom.xml
@@ -114,6 +114,7 @@
     <antlr.version>3.4</antlr.version>
     <tika.version>1.4</tika.version>
     <metrics.version>3.0.0</metrics.version>
+    <rx.version>0.19.6</rx.version>
   </properties>
 
   <licenses>


Mime
View raw message