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https://issues.apache.org/jira/browse/FLINK-8159?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16692833#comment-16692833
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ASF GitHub Bot commented on FLINK-8159:
---------------------------------------
dawidwys commented on a change in pull request #7110: [FLINK-8159] [cep]
Pattern(Flat)SelectFunctions should support RichFunction interface
URL: https://github.com/apache/flink/pull/7110#discussion_r234906587
##########
File path:
flink-libraries/flink-cep/src/main/java/org/apache/flink/cep/CepRuntimeContext.java
##########
@@ -0,0 +1,196 @@
+/*
+ * 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.flink.cep;
+
+import org.apache.flink.api.common.ExecutionConfig;
+import org.apache.flink.api.common.accumulators.Accumulator;
+import org.apache.flink.api.common.accumulators.DoubleCounter;
+import org.apache.flink.api.common.accumulators.Histogram;
+import org.apache.flink.api.common.accumulators.IntCounter;
+import org.apache.flink.api.common.accumulators.LongCounter;
+import org.apache.flink.api.common.cache.DistributedCache;
+import org.apache.flink.api.common.functions.BroadcastVariableInitializer;
+import org.apache.flink.api.common.functions.RuntimeContext;
+import org.apache.flink.api.common.state.AggregatingState;
+import org.apache.flink.api.common.state.AggregatingStateDescriptor;
+import org.apache.flink.api.common.state.FoldingState;
+import org.apache.flink.api.common.state.FoldingStateDescriptor;
+import org.apache.flink.api.common.state.ListState;
+import org.apache.flink.api.common.state.ListStateDescriptor;
+import org.apache.flink.api.common.state.MapState;
+import org.apache.flink.api.common.state.MapStateDescriptor;
+import org.apache.flink.api.common.state.ReducingState;
+import org.apache.flink.api.common.state.ReducingStateDescriptor;
+import org.apache.flink.api.common.state.ValueState;
+import org.apache.flink.api.common.state.ValueStateDescriptor;
+import org.apache.flink.metrics.MetricGroup;
+
+import java.io.Serializable;
+import java.util.List;
+import java.util.Map;
+
+/**
+ * A wrapper class for pattern select function and iterative condition
function's {@link RuntimeContext}.
+ * The runtime context only supports basic operations. Consequently, state
access, accumulators,
+ * broadcast variables and the distributed cache are disabled.
+ */
+public class CepRuntimeContext implements RuntimeContext {
+
+ private final RuntimeContext runtimeContext;
+
+ public CepRuntimeContext(RuntimeContext runtimeContext) {
+ this.runtimeContext = runtimeContext;
+ }
+
+ @Override
+ public String getTaskName() {
+ return runtimeContext.getTaskName();
+ }
+
+ @Override
+ public MetricGroup getMetricGroup() {
+ return runtimeContext.getMetricGroup();
+ }
+
+ @Override
+ public int getNumberOfParallelSubtasks() {
+ return runtimeContext.getNumberOfParallelSubtasks();
+ }
+
+ @Override
+ public int getMaxNumberOfParallelSubtasks() {
+ return runtimeContext.getMaxNumberOfParallelSubtasks();
+ }
+
+ @Override
+ public int getIndexOfThisSubtask() {
+ return runtimeContext.getIndexOfThisSubtask();
+ }
+
+ @Override
+ public int getAttemptNumber() {
+ return runtimeContext.getAttemptNumber();
+ }
+
+ @Override
+ public String getTaskNameWithSubtasks() {
+ return runtimeContext.getTaskNameWithSubtasks();
+ }
+
+ @Override
+ public ExecutionConfig getExecutionConfig() {
+ return runtimeContext.getExecutionConfig();
+ }
+
+ @Override
+ public ClassLoader getUserCodeClassLoader() {
+ return runtimeContext.getUserCodeClassLoader();
+ }
+
+ //
-----------------------------------------------------------------------------------
+ // Unsupported operations
+ //
-----------------------------------------------------------------------------------
+
+ @Override
+ public <V, A extends Serializable> void addAccumulator(
+ String name, Accumulator<V, A> accumulator) {
+ throw new UnsupportedOperationException("Accumulators are not
supported.");
+ }
+
+ @Override
+ public <V, A extends Serializable> Accumulator<V, A>
getAccumulator(String name) {
+ throw new UnsupportedOperationException("Accumulators are not
supported.");
+ }
+
+ @Override
+ public Map<String, Accumulator<?, ?>> getAllAccumulators() {
+ throw new UnsupportedOperationException("Accumulators are not
supported.");
+ }
+
+ @Override
+ public IntCounter getIntCounter(String name) {
+ throw new UnsupportedOperationException("Int counters are not
supported.");
+ }
+
+ @Override
+ public LongCounter getLongCounter(String name) {
+ throw new UnsupportedOperationException("Long counters are not
supported.");
+ }
+
+ @Override
+ public DoubleCounter getDoubleCounter(String name) {
+ throw new UnsupportedOperationException("Double counters are
not supported.");
Review comment:
I don't think they have anything to do with metrics. I think they are rarely
used nowadays and I would like to limit the feature set of the context as much
as possible to decrease complexity of CEP.
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> Pattern(Flat)SelectFunctions should support RichFunction interface
> ------------------------------------------------------------------
>
> Key: FLINK-8159
> URL: https://issues.apache.org/jira/browse/FLINK-8159
> Project: Flink
> Issue Type: Sub-task
> Components: CEP
> Reporter: Dian Fu
> Assignee: Dian Fu
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.8.0
>
>
> {{SelectWrapper}} and {{FlatSelectWrapper}} should extends
> {{AbstractRichFucntion}} and process properly if the underlying functions
> extend RichFunction.
> Things to be very careful about:
> * backwards compatibility (we previously serialized conditions) - changes to
> those interfaces have to be done carefully
> * we want to be able to add dynamic patterns in the future, so at some point
> we have to open also on control message arrival
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