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* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch 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.elasticsearch.action.support.nodes;
import org.elasticsearch.ElasticsearchException;
import org.elasticsearch.action.ActionListener;
import org.elasticsearch.action.FailedNodeException;
import org.elasticsearch.action.NoSuchNodeException;
import org.elasticsearch.action.support.ActionFilters;
import org.elasticsearch.action.support.TransportAction;
import org.elasticsearch.cluster.ClusterName;
import org.elasticsearch.cluster.ClusterService;
import org.elasticsearch.cluster.ClusterState;
import org.elasticsearch.cluster.node.DiscoveryNode;
import org.elasticsearch.cluster.node.DiscoveryNodes;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.threadpool.ThreadPool;
import org.elasticsearch.transport.*;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.AtomicReferenceArray;
/**
*
*/
public abstract class TransportNodesOperationAction<Request extends NodesOperationRequest, Response extends NodesOperationResponse, NodeRequest extends NodeOperationRequest, NodeResponse extends NodeOperationResponse> extends TransportAction<Request, Response> {
protected final ClusterName clusterName;
protected final ClusterService clusterService;
protected final TransportService transportService;
final String transportNodeAction;
final String executor;
protected TransportNodesOperationAction(Settings settings, String actionName, ClusterName clusterName, ThreadPool threadPool,
ClusterService clusterService, TransportService transportService, ActionFilters actionFilters) {
super(settings, actionName, threadPool, actionFilters);
this.clusterName = clusterName;
this.clusterService = clusterService;
this.transportService = transportService;
this.transportNodeAction = actionName + "[n]";
this.executor = executor();
transportService.registerHandler(actionName, new TransportHandler());
transportService.registerHandler(transportNodeAction, new NodeTransportHandler());
}
@Override
protected void doExecute(Request request, ActionListener<Response> listener) {
new AsyncAction(request, listener).start();
}
protected boolean transportCompress() {
return false;
}
protected abstract String executor();
protected abstract Request newRequest();
protected abstract Response newResponse(Request request, AtomicReferenceArray nodesResponses);
protected abstract NodeRequest newNodeRequest();
protected abstract NodeRequest newNodeRequest(String nodeId, Request request);
protected abstract NodeResponse newNodeResponse();
protected abstract NodeResponse nodeOperation(NodeRequest request) throws ElasticsearchException;
protected abstract boolean accumulateExceptions();
protected String[] filterNodeIds(DiscoveryNodes nodes, String[] nodesIds) {
return nodesIds;
}
private class AsyncAction {
private final Request request;
private final String[] nodesIds;
private final ActionListener<Response> listener;
private final ClusterState clusterState;
private final AtomicReferenceArray<Object> responses;
private final AtomicInteger counter = new AtomicInteger();
private AsyncAction(Request request, ActionListener<Response> listener) {
this.request = request;
this.listener = listener;
clusterState = clusterService.state();
String[] nodesIds = clusterState.nodes().resolveNodesIds(request.nodesIds());
this.nodesIds = filterNodeIds(clusterState.nodes(), nodesIds);
this.responses = new AtomicReferenceArray<>(this.nodesIds.length);
}
private void start() {
if (nodesIds.length == 0) {
// nothing to notify
threadPool.generic().execute(new Runnable() {
@Override
public void run() {
listener.onResponse(newResponse(request, responses));
}
});
return;
}
TransportRequestOptions transportRequestOptions = TransportRequestOptions.options();
if (request.timeout() != null) {
transportRequestOptions.withTimeout(request.timeout());
}
transportRequestOptions.withCompress(transportCompress());
for (int i = 0; i < nodesIds.length; i++) {
final String nodeId = nodesIds[i];
final int idx = i;
final DiscoveryNode node = clusterState.nodes().nodes().get(nodeId);
try {
if (nodeId.equals("_local") || nodeId.equals(clusterState.nodes().localNodeId())) {
threadPool.executor(executor()).execute(new Runnable() {
@Override
public void run() {
try {
onOperation(idx, nodeOperation(newNodeRequest(clusterState.nodes().localNodeId(), request)));
} catch (Throwable e) {
onFailure(idx, clusterState.nodes().localNodeId(), e);
}
}
});
} else if (nodeId.equals("_master")) {
threadPool.executor(executor()).execute(new Runnable() {
@Override
public void run() {
try {
onOperation(idx, nodeOperation(newNodeRequest(clusterState.nodes().masterNodeId(), request)));
} catch (Throwable e) {
onFailure(idx, clusterState.nodes().masterNodeId(), e);
}
}
});
} else {
if (node == null) {
onFailure(idx, nodeId, new NoSuchNodeException(nodeId));
} else if (!clusterService.localNode().shouldConnectTo(node)) {
onFailure(idx, nodeId, new NodeShouldNotConnectException(clusterService.localNode(), node));
} else {
NodeRequest nodeRequest = newNodeRequest(nodeId, request);
transportService.sendRequest(node, transportNodeAction, nodeRequest, transportRequestOptions, new BaseTransportResponseHandler<NodeResponse>() {
@Override
public NodeResponse newInstance() {
return newNodeResponse();
}
@Override
public void handleResponse(NodeResponse response) {
onOperation(idx, response);
}
@Override
public void handleException(TransportException exp) {
onFailure(idx, node.id(), exp);
}
@Override
public String executor() {
return ThreadPool.Names.SAME;
}
});
}
}
} catch (Throwable t) {
onFailure(idx, nodeId, t);
}
}
}
private void onOperation(int idx, NodeResponse nodeResponse) {
responses.set(idx, nodeResponse);
if (counter.incrementAndGet() == responses.length()) {
finishHim();
}
}
private void onFailure(int idx, String nodeId, Throwable t) {
if (logger.isDebugEnabled() && !(t instanceof NodeShouldNotConnectException)) {
logger.debug("failed to execute on node [{}]", t, nodeId);
}
if (accumulateExceptions()) {
responses.set(idx, new FailedNodeException(nodeId, "Failed node [" + nodeId + "]", t));
}
if (counter.incrementAndGet() == responses.length()) {
finishHim();
}
}
private void finishHim() {
Response finalResponse;
try {
finalResponse = newResponse(request, responses);
} catch (Throwable t) {
logger.debug("failed to combine responses from nodes", t);
listener.onFailure(t);
return;
}
listener.onResponse(finalResponse);
}
}
private class TransportHandler extends BaseTransportRequestHandler<Request> {
@Override
public Request newInstance() {
return newRequest();
}
@Override
public void messageReceived(final Request request, final TransportChannel channel) throws Exception {
request.listenerThreaded(false);
execute(request, new ActionListener<Response>() {
@Override
public void onResponse(Response response) {
TransportResponseOptions options = TransportResponseOptions.options().withCompress(transportCompress());
try {
channel.sendResponse(response, options);
} catch (Throwable e) {
onFailure(e);
}
}
@Override
public void onFailure(Throwable e) {
try {
channel.sendResponse(e);
} catch (Exception e1) {
logger.warn("Failed to send response", e);
}
}
});
}
@Override
public String executor() {
return ThreadPool.Names.SAME;
}
@Override
public String toString() {
return actionName;
}
}
private class NodeTransportHandler extends BaseTransportRequestHandler<NodeRequest> {
@Override
public NodeRequest newInstance() {
return newNodeRequest();
}
@Override
public void messageReceived(final NodeRequest request, final TransportChannel channel) throws Exception {
channel.sendResponse(nodeOperation(request));
}
@Override
public String toString() {
return transportNodeAction;
}
@Override
public String executor() {
return executor;
}
}
}