Github user huafengw commented on a diff in the pull request:
https://github.com/apache/incubator-gearpump/pull/190#discussion_r123428767
--- Diff:
streaming/src/main/scala/org/apache/gearpump/streaming/refactor/state/StateSpecs.scala
---
@@ -0,0 +1,208 @@
+/*
+ * 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.gearpump.streaming.refactor.state
+
+import java.util.Objects
+
+import org.apache.gearpump.streaming.refactor.coder.Coder
+import org.apache.gearpump.streaming.refactor.state.api.{BagState,
MapState, SetState, ValueState}
+
+/**
+ * a utility object for StateSpec
+ */
+object StateSpecs {
+
+ private class ValueStateSpec[T](coder: Coder[T]) extends
StateSpec[ValueState[T]] {
+
+ var aCoder: Coder[T] = coder
+
+ override def bind(id: String, binder: StateBinder): ValueState[T] = {
+ binder.bindValue(id, this, aCoder)
+ }
+
+ override def offerCoders(coders: Array[Coder[ValueState[T]]]): Unit = {
+ if (this.aCoder == null) {
+ if (coders(0) != null) {
+ this.aCoder = coders(0).asInstanceOf[Coder[T]]
+ }
+ }
+ }
+
+ override def finishSpecifying: Unit = {
+ if (aCoder == null) throw new IllegalStateException(
+ "Unable to infer a coder for ValueState and no Coder"
+ + " was specified. Please set a coder by either invoking"
+ + " StateSpecs.value(Coder<T> valueCoder) or by registering the
coder in the"
+ + " Pipeline's CoderRegistry.")
+ }
+
+ override def equals(obj: Any): Boolean = {
+ if (obj == this) true
+
+ if (!(obj.isInstanceOf[ValueStateSpec[T]])) false
+
+ val that: ValueStateSpec[_] = obj.asInstanceOf[ValueStateSpec[_]]
+ Objects.equals(this.aCoder, that.aCoder)
+ }
+
+ override def hashCode(): Int = {
+ Objects.hashCode(this.aCoder)
+ }
+ }
+
+ private class BagStateSpec[T](coder: Coder[T]) extends
StateSpec[BagState[T]] {
+
+ private implicit var elemCoder = coder
+
+ override def bind(id: String, binder: StateBinder): BagState[T] =
+ binder.bindBag(id, this, elemCoder)
+
+ override def offerCoders(coders: Array[Coder[BagState[T]]]): Unit = {
+ if (this.elemCoder == null) {
+ if (coders(0) != null) {
+ this.elemCoder = coders(0).asInstanceOf[Coder[T]]
+ }
+ }
+ }
+
+ override def finishSpecifying: Unit = {
+ if (elemCoder == null) {
+ throw new IllegalStateException("Unable to infer a coder for
BagState and no Coder"
+ + " was specified. Please set a coder by either invoking"
+ + " StateSpecs.bag(Coder<T> elemCoder) or by registering the
coder in the"
+ + " Pipeline's CoderRegistry.");
+ }
+ }
+
+ override def equals(obj: Any): Boolean = {
+ if (obj == this) true
+
+ if (!obj.isInstanceOf[BagStateSpec[_]]) false
+
+ val that = obj.asInstanceOf[BagStateSpec[_]]
+ Objects.equals(this.elemCoder, that.elemCoder)
+ }
+
+ override def hashCode(): Int = Objects.hash(getClass, elemCoder)
+ }
+
+ private class MapStateSpec[K, V](keyCoder: Coder[K], valueCoder:
Coder[V])
+ extends StateSpec[MapState[K, V]] {
+
+ private implicit var kCoder = keyCoder
+ private implicit var vCoder = valueCoder
+
+ override def bind(id: String, binder: StateBinder): MapState[K, V] =
+ binder.bindMap(id, this, keyCoder, valueCoder)
+
+ override def offerCoders(coders: Array[Coder[MapState[K, V]]]): Unit =
{
+ if (this.kCoder == null) {
+ if (coders(0) != null) {
+ this.kCoder = coders(0).asInstanceOf[Coder[K]]
+ }
+ }
+
+ if (this.vCoder == null) {
+ if (coders(1) != null) {
+ this.vCoder = coders(1).asInstanceOf[Coder[V]]
+ }
+ }
+ }
+
+ override def finishSpecifying: Unit = {
+ if (keyCoder == null || valueCoder == null) {
+ throw new IllegalStateException("Unable to infer a coder for
MapState and no Coder"
+ + " was specified. Please set a coder by either invoking"
+ + " StateSpecs.map(Coder<K> keyCoder, Coder<V> valueCoder) or by
registering the"
+ + " coder in the Pipeline's CoderRegistry.");
+ }
+ }
+
+ override def hashCode(): Int = Objects.hash(getClass, kCoder, vCoder)
+
+ override def equals(obj: Any): Boolean = {
+ if (obj == this) true
+
+ if (!obj.isInstanceOf[MapStateSpec[_, _]]) false
+
+ implicit var that = obj.asInstanceOf[MapStateSpec[_, _]]
+ Objects.equals(this.kCoder, that.vCoder) &&
Objects.equals(this.vCoder, that.vCoder)
+ }
+ }
+
+ private class SetStateSpec[T](coder: Coder[T]) extends
StateSpec[SetState[T]] {
+
+ private implicit var elemCoder = coder
+
+ override def bind(id: String, binder: StateBinder): SetState[T] =
+ binder.bindSet(id, this, elemCoder)
+
+ override def offerCoders(coders: Array[Coder[SetState[T]]]): Unit = {
+ if (this.elemCoder == null) {
+ if (coders(0) != null) {
+ this.elemCoder = coders(0).asInstanceOf[Coder[T]]
+ }
+ }
+ }
+
+ override def finishSpecifying: Unit = {
+ if (elemCoder == null) {
+ throw new IllegalStateException("Unable to infer a coder for
SetState and no Coder"
+ + " was specified. Please set a coder by either invoking"
+ + " StateSpecs.set(Coder<T> elemCoder) or by registering the
coder in the"
+ + " Pipeline's CoderRegistry.");
+ }
+ }
+
+ override def equals(obj: Any): Boolean = {
+ if (obj == this) true
--- End diff --
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