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Subject [GitHub] [nifi] turcsanyip commented on a change in pull request #3858: NIFI-6032 CDC for Oracle using xstream
Date Tue, 05 Nov 2019 14:19:49 GMT
turcsanyip commented on a change in pull request #3858: NIFI-6032 CDC for Oracle using xstream
URL: https://github.com/apache/nifi/pull/3858#discussion_r342541000
 
 

 ##########
 File path: nifi-nar-bundles/nifi-oraclecdc-bundle/nifi-oraclecdc-processors/src/main/java/org/apache/nifi/processors/oraclecdc/OracleChangeCapture.java
 ##########
 @@ -0,0 +1,251 @@
+/*
+ * 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.processors.oraclecdc;
+
+import java.io.IOException;
+import java.io.OutputStream;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+
+import org.apache.commons.codec.binary.Base32;
+import org.apache.nifi.annotation.behavior.InputRequirement;
+import org.apache.nifi.annotation.behavior.InputRequirement.Requirement;
+import org.apache.nifi.annotation.behavior.ReadsAttribute;
+import org.apache.nifi.annotation.behavior.ReadsAttributes;
+import org.apache.nifi.annotation.behavior.Stateful;
+import org.apache.nifi.annotation.behavior.TriggerSerially;
+import org.apache.nifi.annotation.behavior.WritesAttribute;
+import org.apache.nifi.annotation.behavior.WritesAttributes;
+import org.apache.nifi.annotation.documentation.CapabilityDescription;
+import org.apache.nifi.annotation.documentation.SeeAlso;
+import org.apache.nifi.annotation.documentation.Tags;
+import org.apache.nifi.annotation.lifecycle.OnScheduled;
+import org.apache.nifi.annotation.lifecycle.OnShutdown;
+import org.apache.nifi.annotation.lifecycle.OnStopped;
+import org.apache.nifi.components.PropertyDescriptor;
+import org.apache.nifi.components.state.Scope;
+import org.apache.nifi.components.state.StateManager;
+import org.apache.nifi.components.state.StateMap;
+import org.apache.nifi.dbcp.DBCPService;
+import org.apache.nifi.flowfile.FlowFile;
+import org.apache.nifi.processor.AbstractProcessor;
+import org.apache.nifi.processor.ProcessContext;
+import org.apache.nifi.processor.ProcessSession;
+import org.apache.nifi.processor.ProcessorInitializationContext;
+import org.apache.nifi.processor.Relationship;
+import org.apache.nifi.processor.exception.ProcessException;
+import org.apache.nifi.processor.io.OutputStreamCallback;
+import org.apache.nifi.processor.util.StandardValidators;
+import org.nifi.oraclecdcservice.api.OracleCDCEventHandler;
+import org.nifi.oraclecdcservice.api.OracleCDCService;
+
+@TriggerSerially
+@Tags({ "Oracle", "CDC", "change capture" })
+@CapabilityDescription("capture oracle CDC changes using xstream api. "
+        + "Look at this link to see how to setup xstream outbound server on oracle db"
+        + " https://github.com/rkarthik29/oracle_cdc/blob/master/README.md")
+@SeeAlso({})
+@InputRequirement(Requirement.INPUT_FORBIDDEN)
+@ReadsAttributes({ @ReadsAttribute(attribute = "", description = "") })
+@WritesAttributes({ @WritesAttribute(attribute = "cdc_type", description = "provides the
type of cdc operation, "
+        + "ex.INSERT,UPDATE,DELETE,COMMIT") })
+@Stateful(scopes = Scope.CLUSTER, description = "After receiving cdc events from the xstream
out server "
+        + "the processor will store the last position received in the state map. "
+        + "It will be used to set the low watermark for the next call")
+
+public class OracleChangeCapture extends AbstractProcessor {
+
+    public static final PropertyDescriptor XS_OUT = new PropertyDescriptor.Builder().name("XS_OUT")
+            .displayName("XStream Outbound Server Name").description("xout").required(true)
+            .addValidator(StandardValidators.NON_EMPTY_VALIDATOR).build();
+
+    public static final PropertyDescriptor CDC_SERVICE = new PropertyDescriptor.Builder()
+            .name("Oracle CDC connection pooling service")
+            .description("The Controller Service that is used to obtain connection to database").required(true)
+            .identifiesControllerService(OracleCDCService.class).build();
+
+    public static final Relationship INSERTS = new Relationship.Builder().name("INSERTS").description("CDC
INSERTS")
+            .build();
+
+    public static final Relationship UPDATES = new Relationship.Builder().name("UPDATES").description("CDC
UPDATES")
+            .build();
+
+    public static final Relationship DELETES = new Relationship.Builder().name("DELETES").description("CDC
DELETES")
+            .build();
+    public static final Relationship UNMATCHED = new Relationship.Builder().name("UNMATCHED")
+            .description("UNSUPPORTED OPERATION").build();
+
+    private List<PropertyDescriptor> descriptors;
+
+    private Set<Relationship> relationships;
+
+    protected DBCPService dbcpService;
+
+    protected Object xsOut;
+
+    private OracleCDCService cdcService;
+
+    @Override
+    protected void init(final ProcessorInitializationContext context) {
+        final List<PropertyDescriptor> descriptors = new ArrayList<PropertyDescriptor>();
+        descriptors.add(XS_OUT);
+        descriptors.add(CDC_SERVICE);
+        this.descriptors = Collections.unmodifiableList(descriptors);
+
+        final Set<Relationship> relationships = new HashSet<Relationship>();
+        relationships.add(INSERTS);
+        relationships.add(UPDATES);
+        relationships.add(DELETES);
+        relationships.add(UNMATCHED);
+        this.relationships = Collections.unmodifiableSet(relationships);
+    }
+
+    @Override
+    public Set<Relationship> getRelationships() {
+        return this.relationships;
+    }
+
+    @Override
+    public final List<PropertyDescriptor> getSupportedPropertyDescriptors() {
+        return descriptors;
+    }
+
+    @OnScheduled
+    public void onScheduled(final ProcessContext context) {
+        byte[] position = null;
+        final StateManager stateManager = context.getStateManager();
+        StateMap stateMap;
+        try {
+            stateMap = stateManager.getState(Scope.CLUSTER);
+        } catch (final IOException ioe) {
+            stateMap = null;
+            getLogger().warn("Failed to retrieve the low watermark from State Manager", ioe);
+        }
+        if (stateMap != null) {
+            System.out.println("position from statemap" + stateMap.get("positon"));
+            position = new Base32(true).decode(stateMap.get("positon"));
+        }
+        cdcService = context.getProperty(CDC_SERVICE).asControllerService(OracleCDCService.class);
+        String xsOutServerName = context.getProperty(XS_OUT).getValue();
+        xsOut = cdcService.attach(xsOutServerName, position);
+
+    }
+
+    @OnShutdown
+    @OnStopped
+    public void shutdown(final ProcessContext context) {
+        cdcService.detach(xsOut);
+    }
+
+    @Override
+    public void onTrigger(final ProcessContext context, final ProcessSession session) throws
ProcessException {
+        CDCHandler handler = new CDCHandler(session);
+        cdcService.receiveEvents(xsOut, handler);
+        if (handler.isMoveMarker()) {
+            cdcService.setProcessedLowWaterMark(xsOut, handler.getLastPosition());
+
+            final StateManager stateManager = context.getStateManager();
+            try {
+                HashMap<String, String> stateMap = new HashMap<String, String>();
+                System.out.println(
+                        "setting position in SM" + new String(new Base32(true).encode(handler.getLastPosition())));
+                stateMap.put("position", new String(new Base32(true).encode(handler.getLastPosition())));
+                stateManager.setState(stateMap, Scope.CLUSTER);
+            } catch (final IOException ioe) {
+                getLogger().warn("Failed to set the low watermark to State Manager", ioe);
+            }
+        }
+    }
+
+    class CDCHandler implements OracleCDCEventHandler {
+        private byte[] lastPosition = null;
+        private boolean moveMarker = false;
+
+        private final ProcessSession session;
+
+        public CDCHandler(final ProcessSession session) {
+            this.session = session;
+        }
+
+        @Override
+        public void inserts(String events, byte[] position) {
+            // TODO Auto-generated method stub
 
 Review comment:
   Please remove these generated comments.

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