| /* |
| * 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.camel.component.jgroups.raft; |
| |
| import java.util.Map; |
| import java.util.concurrent.atomic.AtomicInteger; |
| |
| import org.apache.camel.Component; |
| import org.apache.camel.Consumer; |
| import org.apache.camel.Exchange; |
| import org.apache.camel.Processor; |
| import org.apache.camel.Producer; |
| import org.apache.camel.spi.Metadata; |
| import org.apache.camel.spi.UriEndpoint; |
| import org.apache.camel.spi.UriParam; |
| import org.apache.camel.spi.UriPath; |
| import org.apache.camel.support.DefaultEndpoint; |
| import org.jgroups.JChannel; |
| import org.jgroups.protocols.raft.StateMachine; |
| import org.jgroups.raft.RaftHandle; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * The jgroups component provides exchange of messages between Camel and JGroups clusters. |
| */ |
| @UriEndpoint(firstVersion = "2.24.0", scheme = "jgroups-raft", title = "JGroups raft", syntax = "jgroup-raft:clusterName", label = "clustering,messaging") |
| public class JGroupsRaftEndpoint extends DefaultEndpoint { |
| private static final Logger LOG = LoggerFactory.getLogger(JGroupsRaftEndpoint.class); |
| |
| private AtomicInteger connectCount = new AtomicInteger(0); |
| |
| private RaftHandle raftHandle; |
| private RaftHandle resolvedRaftHandle; |
| private StateMachine stateMachine; |
| private String raftId; |
| private String channelProperties; |
| |
| @UriPath @Metadata(required = true) |
| private String clusterName; |
| @UriParam(label = "consumer", defaultValue = "false") |
| private boolean enableRoleChangeEvents; |
| |
| public JGroupsRaftEndpoint(String endpointUri, String clusterName, Component component, String remaining, Map<String, Object> parameters, |
| String raftId, String channelProperties, StateMachine stateMachine, RaftHandle raftHandle) { |
| super(endpointUri, component); |
| this.clusterName = clusterName; |
| |
| this.raftId = raftId; |
| this.channelProperties = channelProperties; |
| this.stateMachine = stateMachine; |
| this.raftHandle = raftHandle; |
| } |
| |
| @Override |
| public Producer createProducer() throws Exception { |
| return new JGroupsRaftProducer(this, resolvedRaftHandle, clusterName); |
| } |
| |
| @Override |
| public Consumer createConsumer(Processor processor) throws Exception { |
| return new JGroupsRaftConsumer(this, processor, resolvedRaftHandle, clusterName, enableRoleChangeEvents); |
| } |
| |
| @Override |
| public Exchange createExchange() { |
| Exchange exchange = super.createExchange(); |
| populateJGroupsRaftHeaders(exchange); |
| return exchange; |
| } |
| |
| public void populateJGroupsRaftHeaders(Exchange exchange) { |
| exchange.getIn().setHeader(JGroupsRaftConstants.HEADER_JGROUPSRAFT_COMMIT_INDEX, resolvedRaftHandle.commitIndex()); |
| exchange.getIn().setHeader(JGroupsRaftConstants.HEADER_JGROUPSRAFT_CURRENT_TERM, resolvedRaftHandle.currentTerm()); |
| exchange.getIn().setHeader(JGroupsRaftConstants.HEADER_JGROUPSRAFT_IS_LEADER, resolvedRaftHandle.isLeader()); |
| exchange.getIn().setHeader(JGroupsRaftConstants.HEADER_JGROUPSRAFT_LAST_APPLIED, resolvedRaftHandle.lastApplied()); |
| exchange.getIn().setHeader(JGroupsRaftConstants.HEADER_JGROUPSRAFT_LEADER_ADDRESS, resolvedRaftHandle.leader()); |
| exchange.getIn().setHeader(JGroupsRaftConstants.HEADER_JGROUPSRAFT_LOG_SIZE, resolvedRaftHandle.logSize()); |
| exchange.getIn().setHeader(JGroupsRaftConstants.HEADER_JGROUPSRAFT_LOG_SIZE_BYTE, resolvedRaftHandle.logSizeInBytes()); |
| exchange.getIn().setHeader(JGroupsRaftConstants.HEADER_JGROUPSRAFT_RAFT_ID, resolvedRaftHandle.raftId()); |
| } |
| |
| @Override |
| protected void doStart() throws Exception { |
| LOG.info("Resolving JGroupsraft handle {}", getEndpointUri()); |
| super.doStart(); |
| resolvedRaftHandle = resolveHandle(); |
| } |
| |
| @Override |
| protected void doStop() throws Exception { |
| LOG.info("Closing JGroupsraft Channel {}", getEndpointUri()); |
| if (resolvedRaftHandle != null && resolvedRaftHandle.channel() != null) { |
| resolvedRaftHandle.channel().close(); |
| LOG.info("Closed JGroupsraft Channel {}", getEndpointUri()); |
| } |
| LOG.info("Closing Log {}", getEndpointUri()); |
| if (resolvedRaftHandle != null && resolvedRaftHandle.log() != null) { |
| resolvedRaftHandle.log().close(); |
| LOG.info("Closed Log Channel {}", getEndpointUri()); |
| } |
| super.doStop(); |
| } |
| |
| private RaftHandle resolveHandle() throws Exception { |
| if (raftHandle != null) { |
| LOG.trace("Raft Handle resolved as passed by Component: {}", raftHandle); |
| return raftHandle; |
| } |
| if (channelProperties != null && !channelProperties.isEmpty()) { |
| LOG.trace("Raft Handle created with configured channelProperties: {} and state machine: {}", channelProperties, stateMachine); |
| return new RaftHandle(new JChannel(channelProperties).name(raftId), stateMachine).raftId(raftId); |
| } |
| LOG.trace("Raft Handle created with defaults: {}, {},", JGroupsRaftConstants.DEFAULT_JGROUPSRAFT_CONFIG, stateMachine); |
| return new RaftHandle(new JChannel(JGroupsRaftConstants.DEFAULT_JGROUPSRAFT_CONFIG).name(raftId), stateMachine).raftId(raftId); |
| } |
| |
| /** |
| * Connect shared RaftHandle channel, called by producer and consumer. |
| * @throws Exception |
| */ |
| public void connect() throws Exception { |
| connectCount.incrementAndGet(); |
| LOG.trace("Connecting JGroups-raft Channel {} with cluster name: {}, raftHandle: {} and using config: {}", |
| getEndpointUri(), clusterName, resolvedRaftHandle, channelProperties == null ? "default" : channelProperties); |
| resolvedRaftHandle.channel().connect(clusterName); |
| } |
| |
| /** |
| * Disconnect shared RaftHandle channel, called by producer and consumer. |
| */ |
| public void disconnect() { |
| if (connectCount.decrementAndGet() == 0) { |
| LOG.trace("Disconnecting JGroupsraft Channel {}", getEndpointUri()); |
| resolvedRaftHandle.channel().disconnect(); |
| } |
| } |
| |
| public String getClusterName() { |
| return clusterName; |
| } |
| |
| /** |
| * The name of the JGroupsraft cluster the component should connect to. |
| */ |
| public void setClusterName(String clusterName) { |
| this.clusterName = clusterName; |
| } |
| |
| public boolean isEnableRoleChangeEvents() { |
| return enableRoleChangeEvents; |
| } |
| |
| /** |
| * If set to true, the consumer endpoint will receive roleChange event as well (not just connecting and/or using the state machine). |
| * By default it is set to false. |
| */ |
| public void setEnableRoleChangeEvents(boolean enableRoleChangeEvents) { |
| this.enableRoleChangeEvents = enableRoleChangeEvents; |
| } |
| |
| public String getChannelProperties() { |
| return channelProperties; |
| } |
| |
| public void setChannelProperties(String channelProperties) { |
| this.channelProperties = channelProperties; |
| } |
| |
| public String getRaftId() { |
| return raftId; |
| } |
| |
| public void setRaftId(String raftId) { |
| this.raftId = raftId; |
| } |
| |
| public RaftHandle getRaftHandle() { |
| return raftHandle; |
| } |
| |
| public void setRaftHandle(RaftHandle raftHandle) { |
| this.raftHandle = raftHandle; |
| } |
| |
| public StateMachine getStateMachine() { |
| return stateMachine; |
| } |
| |
| public void setStateMachine(StateMachine stateMachine) { |
| this.stateMachine = stateMachine; |
| } |
| |
| public RaftHandle getResolvedRaftHandle() { |
| return resolvedRaftHandle; |
| } |
| } |