/*
* Copyright (c) 2005-2015, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
*
* WSO2 Inc. 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.wso2.carbon.inbound.endpoint.protocol.kafka;
import org.apache.axiom.om.OMElement;
import org.apache.axiom.om.util.UUIDGenerator;
import org.apache.axis2.AxisFault;
import org.apache.axis2.builder.Builder;
import org.apache.axis2.builder.BuilderUtil;
import org.apache.axis2.builder.SOAPBuilder;
import org.apache.axis2.context.MessageContext;
import org.apache.axis2.transport.TransportUtils;
import org.apache.commons.io.input.AutoCloseInputStream;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.synapse.core.SynapseEnvironment;
import org.apache.synapse.inbound.InboundEndpoint;
import org.apache.synapse.mediators.base.SequenceMediator;
import org.apache.synapse.transport.customlogsetter.CustomLogSetter;
import org.wso2.carbon.context.PrivilegedCarbonContext;
import org.wso2.carbon.utils.multitenancy.MultitenantConstants;
import java.io.ByteArrayInputStream;
import java.io.InputStream;
/**
* KafkaInjectHandler uses to mediate the received Kafka message
*/
public class KAFKAInjectHandler implements InjectHandler {
private static final Log log = LogFactory.getLog(KAFKAInjectHandler.class);
private String injectingSeq;
private String onErrorSeq;
private boolean sequential;
private SynapseEnvironment synapseEnvironment;
private String contentType;
public KAFKAInjectHandler(String injectingSeq, String onErrorSeq, boolean sequential,
SynapseEnvironment synapseEnvironment, String contentType) {
this.injectingSeq = injectingSeq;
this.onErrorSeq = onErrorSeq;
this.sequential = sequential;
this.synapseEnvironment = synapseEnvironment;
this.contentType = contentType;
}
/**
* Determine the message builder to use, set the message payload to the message context and
* inject the message to the sequence
*/
public boolean invoke(Object object, String name) {
byte[] msg = (byte[]) object;
org.apache.synapse.MessageContext msgCtx = createMessageContext();
msgCtx.setProperty("inbound.endpoint.name", name);
InboundEndpoint inboundEndpoint = msgCtx.getConfiguration().getInboundEndpoint(name);
CustomLogSetter.getInstance().setLogAppender(inboundEndpoint.getArtifactContainerName());
log.debug("Processed Kafka Message ");
MessageContext axis2MsgCtx = ((org.apache.synapse.core.axis2.Axis2MessageContext) msgCtx)
.getAxis2MessageContext();
// Determine the message builder to use
Builder builder = null;
if (contentType == null) {
log.debug("No content type specified. Using SOAP builder.");
builder = new SOAPBuilder();
} else {
int index = contentType.indexOf(';');
String type = index > 0 ? contentType.substring(0, index)
: contentType;
try {
builder = BuilderUtil.getBuilderFromSelector(type, axis2MsgCtx);
} catch (AxisFault axisFault) {
log.error("Error while creating message builder :: "
+ axisFault.getMessage(), axisFault);
}
if (builder == null) {
if (log.isDebugEnabled()) {
log.debug("No message builder found for type '" + type
+ "'. Falling back to SOAP.");
}
builder = new SOAPBuilder();
}
}
OMElement documentElement = null;
// set the message payload to the message context
InputStream in = new AutoCloseInputStream(new ByteArrayInputStream(msg));
try {
documentElement = builder.processDocument(in, contentType,
axis2MsgCtx);
} catch (AxisFault axisFault) {
log.error("Error while processing message :: "
+ axisFault.getMessage(), axisFault);
}
try {
msgCtx.setEnvelope(TransportUtils
.createSOAPEnvelope(documentElement));
} catch (AxisFault axisFault) {
log.error("Error while setting message payload to the message context :: "
+ axisFault.getMessage(), axisFault);
}
// Inject the message to the sequence.
if (injectingSeq == null || injectingSeq.equals("")) {
log.error("Sequence name not specified. Sequence : " + injectingSeq);
return false;
}
SequenceMediator seq = (SequenceMediator) synapseEnvironment
.getSynapseConfiguration().getSequence(injectingSeq);
if (seq != null) {
if (log.isDebugEnabled()) {
log.debug("injecting message to sequence : " + injectingSeq);
}
if (!seq.isInitialized()) {
seq.init(synapseEnvironment);
}
seq.setErrorHandler(onErrorSeq);
synapseEnvironment.injectInbound(msgCtx, seq, sequential);
} else {
log.error("Sequence: " + injectingSeq + " not found");
}
return true;
}
/**
* Create the initial message context for kafka
*/
private org.apache.synapse.MessageContext createMessageContext() {
org.apache.synapse.MessageContext msgCtx = synapseEnvironment
.createMessageContext();
MessageContext axis2MsgCtx = ((org.apache.synapse.core.axis2.Axis2MessageContext) msgCtx)
.getAxis2MessageContext();
axis2MsgCtx.setServerSide(true);
axis2MsgCtx.setMessageID(UUIDGenerator.getUUID());
msgCtx.setProperty(MessageContext.CLIENT_API_NON_BLOCKING, true);
PrivilegedCarbonContext carbonContext = PrivilegedCarbonContext.getThreadLocalCarbonContext();
axis2MsgCtx.setProperty(MultitenantConstants.TENANT_DOMAIN, carbonContext.getTenantDomain());
return msgCtx;
}
}