/*
* Licensed to Elastic Search and Shay Banon under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. Elastic Search 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.BaseAction;
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.inject.Inject;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.threadpool.ThreadPool;
import org.elasticsearch.transport.BaseTransportRequestHandler;
import org.elasticsearch.transport.BaseTransportResponseHandler;
import org.elasticsearch.transport.TransportChannel;
import org.elasticsearch.transport.TransportException;
import org.elasticsearch.transport.TransportRequestOptions;
import org.elasticsearch.transport.TransportResponseOptions;
import org.elasticsearch.transport.TransportService;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.AtomicReferenceArray;
/**
* @author kimchy (shay.banon)
*/
public abstract class TransportNodesOperationAction<Request extends NodesOperationRequest, Response extends NodesOperationResponse, NodeRequest extends NodeOperationRequest, NodeResponse extends NodeOperationResponse> extends BaseAction<Request, Response> {
protected final ClusterName clusterName;
protected final ClusterService clusterService;
protected final TransportService transportService;
final String transportAction;
final String transportNodeAction;
final String executor;
@Inject public TransportNodesOperationAction(Settings settings, ClusterName clusterName, ThreadPool threadPool,
ClusterService clusterService, TransportService transportService) {
super(settings, threadPool);
this.clusterName = clusterName;
this.clusterService = clusterService;
this.transportService = transportService;
this.transportAction = transportAction();
this.transportNodeAction = transportNodeAction();
this.executor = executor();
transportService.registerHandler(transportAction, new TransportHandler());
transportService.registerHandler(transportNodeAction, new NodeTransportHandler());
}
@Override protected void doExecute(Request request, ActionListener<Response> listener) {
new AsyncAction(request, listener).start();
}
protected abstract String transportAction();
protected abstract String transportNodeAction();
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 index = new AtomicInteger();
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().resolveNodes(request.nodesIds());
this.nodesIds = filterNodeIds(clusterState.nodes(), nodesIds);
this.responses = new AtomicReferenceArray<Object>(this.nodesIds.length);
}
private void start() {
if (nodesIds.length == 0) {
// nothing to notify
threadPool.cached().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 (final String nodeId : nodesIds) {
final DiscoveryNode node = clusterState.nodes().nodes().get(nodeId);
if (nodeId.equals("_local") || nodeId.equals(clusterState.nodes().localNodeId())) {
threadPool.executor(executor()).execute(new Runnable() {
@Override public void run() {
try {
onOperation(nodeOperation(newNodeRequest(clusterState.nodes().localNodeId(), request)));
} catch (Exception e) {
onFailure(clusterState.nodes().localNodeId(), e);
}
}
});
} else if (nodeId.equals("_master")) {
threadPool.executor(executor()).execute(new Runnable() {
@Override public void run() {
try {
onOperation(nodeOperation(newNodeRequest(clusterState.nodes().masterNodeId(), request)));
} catch (Exception e) {
onFailure(clusterState.nodes().masterNodeId(), e);
}
}
});
} else {
if (node == null) {
onFailure(nodeId, new NoSuchNodeException(nodeId));
} 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(response);
}
@Override public void handleException(TransportException exp) {
onFailure(node.id(), exp);
}
@Override public String executor() {
return ThreadPool.Names.SAME;
}
});
}
}
}
}
private void onOperation(NodeResponse nodeResponse) {
// need two counters to avoid race conditions
responses.set(index.getAndIncrement(), nodeResponse);
if (counter.incrementAndGet() == responses.length()) {
finishHim();
}
}
private void onFailure(String nodeId, Throwable t) {
if (logger.isDebugEnabled()) {
logger.debug("failed to execute on node [{}]", t, nodeId);
}
int idx = index.getAndIncrement();
if (accumulateExceptions()) {
responses.set(idx, new FailedNodeException(nodeId, "Failed node [" + nodeId + "]", t));
}
if (counter.incrementAndGet() == responses.length()) {
finishHim();
}
}
private void finishHim() {
listener.onResponse(newResponse(request, responses));
}
}
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 (Exception 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 transportAction;
}
}
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;
}
}
}