/**
* 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.ambari.server.metadata;
import java.util.HashMap;
import java.util.LinkedHashSet;
import java.util.Map;
import org.apache.ambari.server.AmbariException;
import org.apache.ambari.server.state.Cluster;
import org.apache.ambari.server.state.Clusters;
import org.apache.commons.lang.builder.HashCodeBuilder;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.google.inject.Inject;
import com.google.inject.Injector;
/**
* RoleCommandOrderProvider which caches RoleCommandOrder objects for a cluster to avoid the cost of construction of
* RoleCommandOrder objects each time.
*/
public class CachedRoleCommandOrderProvider implements RoleCommandOrderProvider {
private static Logger LOG = LoggerFactory.getLogger(CachedRoleCommandOrderProvider.class);
@Inject
private Injector injector;
@Inject
private Clusters clusters;
private Map<Integer, RoleCommandOrder> rcoMap = new HashMap<>();
@Inject
public CachedRoleCommandOrderProvider() {
}
@Override
public RoleCommandOrder getRoleCommandOrder(Long clusterId) {
Cluster cluster = null;
try {
cluster = clusters.getCluster(clusterId);
return getRoleCommandOrder(cluster);
} catch (AmbariException e) {
return null;
}
}
@Override
public RoleCommandOrder getRoleCommandOrder(Cluster cluster) {
boolean hasGLUSTERFS = false;
boolean isNameNodeHAEnabled = false;
boolean isResourceManagerHAEnabled = false;
try {
if (cluster != null && cluster.getService("GLUSTERFS") != null) {
hasGLUSTERFS = true;
}
} catch (AmbariException ignored) {
}
try {
if (cluster != null &&
cluster.getService("HDFS") != null &&
cluster.getService("HDFS").getServiceComponent("JOURNALNODE") != null) {
isNameNodeHAEnabled = true;
}
} catch (AmbariException ignored) {
}
try {
if (cluster != null &&
cluster.getService("YARN") != null &&
cluster.getService("YARN").getServiceComponent("RESOURCEMANAGER").getServiceComponentHosts().size() > 1) {
isResourceManagerHAEnabled = true;
}
} catch (AmbariException ignored) {
}
int clusterCacheId = new HashCodeBuilder().append(cluster.getClusterId()).append(hasGLUSTERFS).append(isNameNodeHAEnabled).append
(isResourceManagerHAEnabled).toHashCode();
RoleCommandOrder rco = rcoMap.get(clusterCacheId);
if (rco == null) {
rco = injector.getInstance(RoleCommandOrder.class);
LinkedHashSet<String> sectionKeys = new LinkedHashSet<>();
if (hasGLUSTERFS) {
sectionKeys.add(RoleCommandOrder.GLUSTERFS_DEPS_KEY);
} else {
sectionKeys.add(RoleCommandOrder.NO_GLUSTERFS_DEPS_KEY);
}
if (isNameNodeHAEnabled) {
sectionKeys.add(RoleCommandOrder.NAMENODE_HA_DEPS_KEY);
}
if (isResourceManagerHAEnabled) {
sectionKeys.add(RoleCommandOrder.RESOURCEMANAGER_HA_DEPS_KEY);
}
rco.initialize(cluster, sectionKeys);
rcoMap.put(clusterCacheId, rco);
}
return rco;
}
}