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https://issues.apache.org/jira/browse/NIFI-5229?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16491484#comment-16491484
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ASF GitHub Bot commented on NIFI-5229:
--------------------------------------
Github user mattyb149 commented on a diff in the pull request:
https://github.com/apache/nifi/pull/2735#discussion_r191038289
--- Diff:
nifi-nar-bundles/nifi-standard-services/nifi-dbcp-service-bundle/nifi-dbcp-service/src/main/java/org/apache/nifi/dbcp/DBCPConnectionPoolLookup.java
---
@@ -0,0 +1,140 @@
+/*
+ * 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.nifi.dbcp;
+
+import org.apache.commons.lang3.StringUtils;
+import org.apache.nifi.annotation.behavior.DynamicProperty;
+import org.apache.nifi.annotation.documentation.CapabilityDescription;
+import org.apache.nifi.annotation.documentation.Tags;
+import org.apache.nifi.annotation.lifecycle.OnDisabled;
+import org.apache.nifi.annotation.lifecycle.OnEnabled;
+import org.apache.nifi.components.PropertyDescriptor;
+import org.apache.nifi.components.ValidationContext;
+import org.apache.nifi.components.ValidationResult;
+import org.apache.nifi.controller.AbstractControllerService;
+import org.apache.nifi.controller.ConfigurationContext;
+import org.apache.nifi.expression.ExpressionLanguageScope;
+import org.apache.nifi.processor.exception.ProcessException;
+import org.apache.nifi.processor.util.StandardValidators;
+
+import java.sql.Connection;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+@Tags({ "dbcp", "jdbc", "database", "connection", "pooling", "store" })
+@CapabilityDescription("Provides a DBCPService that can be used to
dynamically select another DBCPService. This service " +
+ "requires an attribute named 'database.name' to be passed in when
asking for a connection, and will throw an exception " +
+ "if the attribute is missing. The value of 'database.name' will be
used to select the DBCPService that has been " +
+ "registered with that name. This will allow multiple DBCPServices
to be defined and registered, and then selected " +
+ "dynamically at runtime by tagging flow files with the appropriate
'database.name' attribute.")
+@DynamicProperty(name = "The ", value = "JDBC property value",
expressionLanguageScope = ExpressionLanguageScope.NONE,
+ description = "")
+public class DBCPConnectionPoolLookup extends AbstractControllerService
implements DBCPService {
--- End diff --
This has the suffix "Lookup" but is really a Delegate in our terminology
right? I'm thinking of (was it Joey's?) DB Lookup CS, or when/wherever we get a
LookupService impl that can access RDBMS tables...
> Implement a DBCPConnectionPool that dynamically selects a connection pool
> -------------------------------------------------------------------------
>
> Key: NIFI-5229
> URL: https://issues.apache.org/jira/browse/NIFI-5229
> Project: Apache NiFi
> Issue Type: Improvement
> Reporter: Bryan Bende
> Priority: Major
> Fix For: 1.7.0
>
>
> In NIFI-5121 we modified the DBCPConnectionPool interface to allow passing a
> map of attributes (https://issues.apache.org/jira/browse/NIFI-5121).
> We should implement a DBCPConnectionPool that lets you register multiple
> other connection pools via dynamic properties, and then selects one based on
> looking for an incoming attribute.
> For example, lets say you create two regular connection pools A and B, then
> in the new connection pool you would register:
> a = pool1
> b = pool2
> and then the new connection pool will look in the attribute map for an
> attribute like "database.id" and select the pool with the given id.
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