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/*
* Copyright (c) 2010-2015 Pivotal Software, Inc. All rights reserved.
*
* Licensed 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. See accompanying
* LICENSE file.
*/
package com.gemstone.gemfire.admin.internal;
import com.gemstone.gemfire.CancelException;
import com.gemstone.gemfire.admin.*;
import com.gemstone.gemfire.internal.Assert;
import com.gemstone.gemfire.internal.admin.*;
import com.gemstone.gemfire.internal.i18n.LocalizedStrings;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.*;
/**
* Provides the implementation of the GemFireHealth
* administration API. This class is responsible for {@linkplain
* GemFireVM#addHealthListener sending} the {@link
* GemFireHealthConfig}s to the remote member VM in which the health
* is calcualted.
*
* @author David Whitlock
*
* @since 3.5
*/
public class GemFireHealthImpl
implements GemFireHealth, JoinLeaveListener, HealthListener {
/** The distributed system whose health is being monitored */
private final GfManagerAgent agent;
/** The default configuration for checking GemFire health */
protected GemFireHealthConfig defaultConfig;
/** Maps the name of a host to its GemFireHealthConfig.
* Note that the mappings are created lazily. */
private final Map hostConfigs;
/** Maps the name of a host to all of the members
* (GemFireVMs) that run on that host. */
private final Map hostMembers;
/** The members that are known to be in {@link #OKAY_HEALTH}. */
private Collection okayHealth;
/** The members that are known to be in {@link #POOR_HEALTH}. */
private Collection poorHealth;
/** The overall health of GemFire */
private GemFireHealth.Health overallHealth;
/** Is this GemFireHealthImpl closed? */
private boolean isClosed;
/** The configuration specifying how the health of the distributed
* system should be computed. */
protected volatile DistributedSystemHealthConfig dsHealthConfig;
/** Monitors the health of the entire distributed system */
private DistributedSystemHealthMonitor dsHealthMonitor = null;
/** The distributed system whose health is monitored by this
* GemFireHealth. */
private final AdminDistributedSystem system;
/////////////////////// Constructors ///////////////////////
/**
* Creates a new GemFireHealthImpl that monitors the
* health of member of the given distributed system.
*/
protected GemFireHealthImpl(GfManagerAgent agent,
AdminDistributedSystem system) {
// agent.getDM().getLogger().info("Creating GemFireHealthImpl",
// new Exception("Stack trace"));
this.agent = agent;
this.system = system;
this.hostConfigs = new HashMap();
this.hostMembers = new HashMap();
this.okayHealth = new HashSet();
this.poorHealth = new HashSet();
this.overallHealth = GOOD_HEALTH;
this.isClosed = false;
GemFireVM[] apps = this.agent.listApplications();
for (int i = 0; i < apps.length; i++) {
GemFireVM member = apps[i];
this.noteNewMember(member);
}
agent.addJoinLeaveListener(this);
setDefaultGemFireHealthConfig(createGemFireHealthConfig(null));
setDistributedSystemHealthConfig(createDistributedSystemHealthConfig());
}
@Override
public String toString() {
StringBuffer sb = new StringBuffer();
sb.append("closed=" + isClosed);
sb.append("; hostMembers=" + hostMembers);
sb.append("; okayHealth=" + okayHealth);
sb.append("; poorHealth=" + poorHealth);
sb.append("; overallHealth=" + overallHealth);
sb.append("; diagnosis=" + getDiagnosis());
return sb.toString();
}
////////////////////// Instance Methods //////////////////////
/**
* Returns the DistributedSystem whose health this
* GemFireHealth monitors.
*/
public AdminDistributedSystem getDistributedSystem() {
return this.system;
}
/**
* A "template factory" method for creating a
* DistributedSystemHealthConfig. It can be overridden
* by subclasses to produce instances of different
* DistributedSystemHealthConfig implementations.
*/
protected DistributedSystemHealthConfig
createDistributedSystemHealthConfig() {
return new DistributedSystemHealthConfigImpl();
}
/**
* A "template factory" method for creating a
* GemFireHealthConfig. It can be overridden by
* subclasses to produce instances of different
* GemFireHealthConfig implementations.
*
* @param hostName
* The host whose health we are configuring
*/
protected GemFireHealthConfig
createGemFireHealthConfig(String hostName) {
return new GemFireHealthConfigImpl(hostName);
}
/**
* Throws an {@link IllegalStateException} if this
* GemFireHealthImpl is closed.
*/
private void checkClosed() {
if (this.isClosed) {
throw new IllegalStateException(LocalizedStrings.GemFireHealthImpl_CANNOT_ACCESS_A_CLOSED_GEMFIREHEALTH_INSTANCE.toLocalizedString());
}
}
/**
* Returns the overall health of GemFire. Note that this method
* does not contact any of the member VMs. Instead, it relies on
* the members to alert it of changes in its health via a {@link
* HealthListener}.
*/
public GemFireHealth.Health getHealth() {
checkClosed();
return this.overallHealth;
}
/**
* Resets the overall health to be {@link #GOOD_HEALTH}. It also
* resets the health in the member VMs.
*
* @see GemFireVM#resetHealthStatus
*/
public void resetHealth() {
checkClosed();
this.overallHealth = GOOD_HEALTH;
this.okayHealth.clear();
this.poorHealth.clear();
synchronized (this) {
for (Iterator iter = hostMembers.values().iterator();
iter.hasNext(); ) {
List members = (List) iter.next();
for (Iterator iter2 = members.iterator(); iter2.hasNext(); ) {
GemFireVM member = (GemFireVM) iter2.next();
member.resetHealthStatus();
}
}
}
}
/**
* Aggregates the diagnoses from all members of the distributed
* system.
*/
public String getDiagnosis() {
checkClosed();
StringBuilder sb = new StringBuilder();
synchronized (this) {
for (Iterator iter = hostMembers.values().iterator();
iter.hasNext(); ) {
List members = (List) iter.next();
for (Iterator iter2 = members.iterator(); iter2.hasNext(); ) {
GemFireVM member = (GemFireVM) iter2.next();
String[] diagnoses =
member.getHealthDiagnosis(this.overallHealth);
for (int i = 0; i < diagnoses.length; i++) {
sb.append(diagnoses[i]).append("\n");;
}
}
}
}
return sb.toString();
}
/**
* Starts a new {@link DistributedSystemHealthMonitor}
*/
public void setDistributedSystemHealthConfig(DistributedSystemHealthConfig
config) {
synchronized (this.hostConfigs) {
// If too many threads are changing the health config, then we
// will might get an OutOfMemoryError trying to start a new
// health monitor thread.
if (this.dsHealthMonitor != null) {
this.dsHealthMonitor.stop();
}
this.dsHealthConfig = config;
DistributedSystemHealthEvaluator eval =
new DistributedSystemHealthEvaluator(config, this.agent.getDM());
int interval =
this.getDefaultGemFireHealthConfig().getHealthEvaluationInterval();
this.dsHealthMonitor =
new DistributedSystemHealthMonitor(eval, this, interval,
this.agent.getDM().getLoggerI18n());
this.dsHealthMonitor.start();
}
}
public DistributedSystemHealthConfig
getDistributedSystemHealthConfig() {
checkClosed();
return this.dsHealthConfig;
}
public GemFireHealthConfig getDefaultGemFireHealthConfig() {
checkClosed();
return this.defaultConfig;
}
public void setDefaultGemFireHealthConfig(GemFireHealthConfig config) {
checkClosed();
if (config.getHostName() != null) {
throw new IllegalArgumentException(LocalizedStrings.GemFireHealthImpl_THE_GEMFIREHEALTHCONFIG_FOR_FOR_0_CANNOT_SERVE_AS_THE_DEFAULT_HEALTH_CONFIG.toLocalizedString(config.getHostName()));
}
this.defaultConfig = config;
synchronized (this) {
for (Iterator iter = this.hostMembers.entrySet().iterator();
iter.hasNext(); ) {
Map.Entry entry = (Map.Entry) iter.next();
InetAddress hostIpAddress = (InetAddress) entry.getKey();
List members = (List) entry.getValue();
GemFireHealthConfig hostConfig =
(GemFireHealthConfig) hostConfigs.get(hostIpAddress);
if (hostConfig == null) {
hostConfig = config;
}
for (Iterator iter2 = members.iterator(); iter2.hasNext(); ) {
GemFireVM member = (GemFireVM) iter2.next();
Assert.assertTrue(member.getHost().equals(hostIpAddress));
member.addHealthListener(this, hostConfig);
}
}
}
// We only need to do this if the health monitoring interval has
// change. This is probably not the most efficient way of doing
// things.
if (this.dsHealthConfig != null) {
setDistributedSystemHealthConfig(this.dsHealthConfig);
}
}
/**
* Returns the GemFireHealthConfig object for the given host name.
*
* @param hostName
* host name for which the GemFire Health Config is needed
*
* @throws IllegalArgumentException
* if host with given name could not be found
*/
public synchronized GemFireHealthConfig
getGemFireHealthConfig(String hostName){
checkClosed();
InetAddress hostIpAddress = null;
try {
hostIpAddress = InetAddress.getByName(hostName);
} catch (UnknownHostException e) {
throw new IllegalArgumentException(
LocalizedStrings.GemFireHealthImpl_COULD_NOT_FIND_A_HOST_WITH_NAME_0
.toLocalizedString(hostName), e);
}
GemFireHealthConfig config =
(GemFireHealthConfig) this.hostConfigs.get(hostIpAddress);
if (config == null) {
config = createGemFireHealthConfig(hostName);
this.hostConfigs.put(hostIpAddress, config);
}
return config;
}
/**
* Sets the GemFireHealthConfig object for the given host name.
*
* @param hostName
* host name for which the GemFire Health Config is needed
* @param config
* GemFireHealthConfig object to set
*
* @throws IllegalArgumentException
* if (1) given host name & the host name in the given config do not
* match OR (2) host with given name could not be found OR (3) there
* are no GemFire components running on the given host
*/
public void setGemFireHealthConfig(String hostName,
GemFireHealthConfig config) {
checkClosed();
synchronized (this) {
String configHost = config.getHostName();
if (configHost == null || !configHost.equals(hostName)) {
StringBuffer sb = new StringBuffer();
sb.append("The GemFireHealthConfig configures ");
if (configHost == null) {
sb.append("the default host ");
} else {
sb.append("host \"");
sb.append(config.getHostName());
sb.append("\" ");
}
sb.append("not \"" + hostName + "\"");
throw new IllegalArgumentException(sb.toString());
}
InetAddress hostIpAddress = null;
try {
hostIpAddress = InetAddress.getByName(hostName);
} catch (UnknownHostException e) {
throw new IllegalArgumentException(
LocalizedStrings.GemFireHealthImpl_COULD_NOT_FIND_A_HOST_WITH_NAME_0
.toLocalizedString(hostName), e);
}
List members = (List) this.hostMembers.get(hostIpAddress);
if (members == null || members.isEmpty()) {
throw new IllegalArgumentException(
LocalizedStrings.GemFireHealthImpl_THERE_ARE_NO_GEMFIRE_COMPONENTS_ON_HOST_0
.toLocalizedString(hostName));
}
for (Iterator iter = members.iterator(); iter.hasNext(); ) {
GemFireVM member = (GemFireVM) iter.next();
member.addHealthListener(this, config);
}
}
}
/**
* Tells the members of the distributed system that we are no longer
* interested in monitoring their health.
*
* @see GemFireVM#removeHealthListener
*/
public void close(){
this.agent.removeJoinLeaveListener(this);
synchronized (this) {
if (this.isClosed) {
return;
}
this.isClosed = true;
if (this.dsHealthMonitor != null) {
this.dsHealthMonitor.stop();
this.dsHealthMonitor = null;
}
try {
for (Iterator iter = hostMembers.values().iterator();
iter.hasNext(); ) {
List members = (List) iter.next();
for (Iterator iter2 = members.iterator(); iter2.hasNext(); ) {
GemFireVM member = (GemFireVM) iter2.next();
member.removeHealthListener();
}
}
} catch (CancelException e) {
// if the DS is disconnected, stop trying to distribute to other members
}
hostConfigs.clear();
hostMembers.clear();
okayHealth.clear();
poorHealth.clear();
}
}
public boolean isClosed() {
return this.isClosed;
}
/**
* Makes note of the newly-joined member
*/
private void noteNewMember(GemFireVM member) {
InetAddress hostIpAddress = member.getHost();
List members = (List) this.hostMembers.get(hostIpAddress);
if (members == null) {
members = new ArrayList();
this.hostMembers.put(hostIpAddress, members);
}
members.add(member);
}
public synchronized void nodeJoined(GfManagerAgent source,
GemFireVM joined) {
noteNewMember(joined);
InetAddress hostIpAddress = joined.getHost();
GemFireHealthConfig config =
(GemFireHealthConfig) this.hostConfigs.get(hostIpAddress);
if (config == null) {
config = this.getDefaultGemFireHealthConfig();
}
joined.addHealthListener(this, config);
}
/**
* Makes note of the newly-left member
*/
public synchronized void nodeLeft(GfManagerAgent source,
GemFireVM left) {
InetAddress hostIpAddress = left.getHost();
List members = (List) this.hostMembers.get(hostIpAddress);
if (members != null) {
members.remove(left);
if (members.isEmpty()) {
// No more members on the host
this.hostConfigs.remove(hostIpAddress);
this.hostMembers.remove(hostIpAddress);
}
}
this.okayHealth.remove(left);
this.poorHealth.remove(left);
reevaluateHealth();
}
/**
* Does the same thing as {@link #nodeLeft}
*/
public void nodeCrashed(GfManagerAgent source, GemFireVM crashed) {
nodeLeft(source, crashed);
}
/**
* Re-evaluates the overall health of GemFire
*/
private void reevaluateHealth() {
if (!this.poorHealth.isEmpty()) {
this.overallHealth = POOR_HEALTH;
} else if (!this.okayHealth.isEmpty()) {
this.overallHealth = OKAY_HEALTH;
} else {
this.overallHealth = GOOD_HEALTH;
}
}
public void healthChanged(GemFireVM member, GemFireHealth.Health status) {
if (status == GOOD_HEALTH) {
this.okayHealth.remove(member);
this.poorHealth.remove(member);
} else if (status == OKAY_HEALTH) {
this.okayHealth.add(member);
this.poorHealth.remove(member);
} else if (status == POOR_HEALTH) {
this.okayHealth.remove(member);
this.poorHealth.add(member);
} else {
Assert.assertTrue(false, "Unknown health code: " + status);
}
reevaluateHealth();
}
}