forked from community/device-mgt-core
parent
c566d95f77
commit
a5218f538e
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package org.wso2.carbon.policy.mgt.core.cache.guava;
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import org.wso2.carbon.policy.mgt.common.PolicyManagementException;
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public class GuavaPolicyCacheException extends PolicyManagementException {
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private static final long serialVersionUID = 458698541247633587L;
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private String errorMessage;
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public void setErrorMessage(String errorMessage) {
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this.errorMessage = errorMessage;
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}
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public String getErrorMessage() {
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return errorMessage;
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}
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public GuavaPolicyCacheException() {
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super();
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}
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public GuavaPolicyCacheException(Throwable cause) {
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super(cause);
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}
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public GuavaPolicyCacheException(String errorMessage, Throwable cause) {
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super(cause);
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setErrorMessage(errorMessage);
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}
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}
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package org.wso2.carbon.policy.mgt.core.cache.guava;
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import org.wso2.carbon.context.PrivilegedCarbonContext;
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import java.util.Objects;
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public class GuavaPolicyCacheKey {
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private final int tenantId;
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private final int policyId;
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private volatile int hashCode;
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public GuavaPolicyCacheKey(int policyId) {
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int tenantId = PrivilegedCarbonContext.getThreadLocalCarbonContext().getTenantId();
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this.tenantId = tenantId;
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this.policyId = policyId;
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}
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public int getTenantId() {
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return tenantId;
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}
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public int getPolicyId() {
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return policyId;
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}
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@Override
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public String toString() {
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return tenantId+"/"+policyId;
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}
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@Override
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public boolean equals(Object other) {
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if(!(other instanceof GuavaPolicyCacheKey)) {
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return false;
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}
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GuavaPolicyCacheKey otherPolicyCacheKey = (GuavaPolicyCacheKey) other;
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return (tenantId == otherPolicyCacheKey.tenantId
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&& policyId == otherPolicyCacheKey.policyId);
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}
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@Override
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public int hashCode() {
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if(hashCode == 0) {
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hashCode = Objects.hash(tenantId, policyId);
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}
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return hashCode;
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}
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}
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package org.wso2.carbon.policy.mgt.core.cache.guava;
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import org.wso2.carbon.device.mgt.common.policy.mgt.Policy;
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import org.wso2.carbon.policy.mgt.common.PolicyManagementException;
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import java.util.List;
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public interface GuavaPolicyCacheManager {
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/*
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* return list of policies requested by policy ids,
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* if the requested ids contains invalid policy ids this will only return policies for valid ids
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* */
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List<Policy> getPolicies(List<Integer> policyIds) throws PolicyManagementException;
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/* return all polices - ensures to return all the policies exists in the database */
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List<Policy> getAllPolicies() throws PolicyManagementException;
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List<Policy> getAllPolicies(String deviceType) throws PolicyManagementException;
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/*
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* return the policy requested by policy id,
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* if the requested id invalid this will return null
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* */
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Policy getPolicy(Policy policy) throws PolicyManagementException;
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/*
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* return the policy requested by policy id,
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* if the requested id invalid this will return null
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* */
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Policy getPolicy(int policyId) throws PolicyManagementException;
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/* add policy to the cache - make sure to execute when creating policies */
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void addPolicies(List<Policy> policies);
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/* add policy to the cache - make sure to run when creating a policy */
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void addPolicy(Policy policy);
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/* update the policies using provided policies */
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void updatePolicies(List<Policy> policies);
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/* update the policies using provided policy */
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void updatePolicy(Policy policy);
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void refreshPolicy(Policy policy);
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void refreshPolicy(int policyId);
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void invalidatePolicy(Policy policy);
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void invalidatePolicy(int policyId);
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void invalidateAll();
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/* refresh the cache with newly loaded values from the database */
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void rePopulateCache() throws PolicyManagementException;
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}
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package org.wso2.carbon.policy.mgt.core.cache.guava.impl;
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import com.google.common.cache.LoadingCache;
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import org.apache.commons.logging.Log;
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import org.apache.commons.logging.LogFactory;
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import org.wso2.carbon.device.mgt.common.policy.mgt.Policy;
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import org.wso2.carbon.policy.mgt.common.PolicyManagementException;
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import org.wso2.carbon.policy.mgt.core.cache.guava.GuavaPolicyCacheKey;
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import org.wso2.carbon.policy.mgt.core.cache.guava.GuavaPolicyCacheManager;
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import org.wso2.carbon.policy.mgt.core.cache.guava.utils.GuavaPolicyCacheBuilder;
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import org.wso2.carbon.policy.mgt.core.mgt.PolicyManager;
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import org.wso2.carbon.policy.mgt.core.mgt.impl.PolicyManagerImpl;
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import java.util.*;
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import java.util.concurrent.ExecutionException;
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import java.util.stream.Collectors;
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public class GuavaPolicyCacheManagerImpl implements GuavaPolicyCacheManager {
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private static final Log log = LogFactory.getLog(GuavaPolicyCacheManagerImpl.class);
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private static LoadingCache<GuavaPolicyCacheKey, Policy> policyCache;
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private static volatile GuavaPolicyCacheManagerImpl policyCacheManager;
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private GuavaPolicyCacheManagerImpl() {
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}
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public static GuavaPolicyCacheManagerImpl getInstance() {
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if(policyCacheManager == null) {
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synchronized (GuavaPolicyCacheManagerImpl.class) {
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if(policyCacheManager == null) {
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policyCacheManager = new GuavaPolicyCacheManagerImpl();
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setPolicyCache();
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}
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}
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}
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return policyCacheManager;
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}
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@Override
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public List<Policy> getPolicies(List<Integer> policyIds) throws PolicyManagementException {
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List<Policy> resultPolicyList;
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Map<GuavaPolicyCacheKey, Policy> cacheMap;
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try {
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cacheMap = policyCache.getAll(generateCacheKeys(policyIds));
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resultPolicyList = cacheMap.values().stream().
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filter(policy -> policy != GuavaPolicyCacheBuilder.NULL).
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collect(Collectors.toList());
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} catch (ExecutionException ex) {
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log.error("Error occurred when retrieving policies from cache");
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throw new PolicyManagementException("Error occurred (fails to return policies for policy ids "+policyIds.toString()+")", ex);
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}
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return resultPolicyList;
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}
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@Override
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public List<Policy> getAllPolicies() throws PolicyManagementException {
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PolicyManager policyManager = new PolicyManagerImpl();
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List<Integer> tenantSpecificPolicyIds = policyManager.getAllPolicyIds();
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return getPolicies(tenantSpecificPolicyIds);
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}
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@Override
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public List<Policy> getAllPolicies(String deviceType) throws PolicyManagementException {
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List<Policy> allPolicies = getAllPolicies();
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return allPolicies.stream().
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filter(policy -> deviceType.equals(policy.getOwnershipType())).
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collect(Collectors.toList());
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}
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@Override
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public Policy getPolicy(Policy policy) throws PolicyManagementException {
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return getPolicy(policy.getId());
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}
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@Override
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public Policy getPolicy(int policyId) throws PolicyManagementException {
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Policy resultPolicy;
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try {
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GuavaPolicyCacheKey key = new GuavaPolicyCacheKey(policyId);
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resultPolicy = policyCache.get(key);
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if(resultPolicy == GuavaPolicyCacheBuilder.NULL) {
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resultPolicy = null;
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}
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}catch (ExecutionException ex) {
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log.error("Error occurred when retrieving policy from cache");
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throw new PolicyManagementException("Error occurred (fails to fetch requested policy for policy id "+policyId+")", ex);
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}
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return resultPolicy;
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}
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@Override
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public void addPolicies(List<Policy> policies) {
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Map<GuavaPolicyCacheKey, Policy> policyMap = new HashMap<>();
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for(Policy policy : policies) {
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GuavaPolicyCacheKey key = new GuavaPolicyCacheKey(policy.getId());
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policyMap.put(key, policy);
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}
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policyCache.putAll(policyMap);
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}
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@Override
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public void addPolicy(Policy policy) {
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GuavaPolicyCacheKey key = new GuavaPolicyCacheKey(policy.getId());
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policyCache.put(key, policy);
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}
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@Override
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public void updatePolicies(List<Policy> policies) {
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addPolicies(policies);
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}
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@Override
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public void updatePolicy(Policy policy) {
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addPolicy(policy);
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}
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@Override
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public void refreshPolicy(Policy policy) {
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refreshPolicy(policy.getId());
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}
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@Override
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public void refreshPolicy(int policyId) {
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GuavaPolicyCacheKey key = new GuavaPolicyCacheKey(policyId);
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policyCache.refresh(key);
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}
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@Override
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public void invalidatePolicy(Policy policy) {
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invalidatePolicy(policy.getId());
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}
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@Override
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public void invalidatePolicy(int policyId) {
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GuavaPolicyCacheKey key = new GuavaPolicyCacheKey(policyId);
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policyCache.invalidate(key);
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}
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@Override
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public void invalidateAll() {
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policyCache.invalidateAll();
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}
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@Override
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public void rePopulateCache() throws PolicyManagementException {
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invalidateAll();
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getAllPolicies();
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}
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private static void setPolicyCache() {
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GuavaPolicyCacheBuilder cacheBuilder = new GuavaPolicyCacheBuilder();
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policyCache = cacheBuilder.withCacheBuilder().withCacheLoader().build();
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}
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private List<GuavaPolicyCacheKey> generateCacheKeys(List<Integer> policyIds) {
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return policyIds.stream().map(GuavaPolicyCacheKey::new).collect(Collectors.toList());
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}
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}
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@ -0,0 +1,77 @@
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package org.wso2.carbon.policy.mgt.core.cache.guava.utils;
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import com.google.common.cache.CacheBuilder;
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import com.google.common.cache.CacheLoader;
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import com.google.common.cache.LoadingCache;
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import org.apache.commons.logging.Log;
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import org.apache.commons.logging.LogFactory;
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import org.wso2.carbon.device.mgt.common.policy.mgt.Policy;
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import org.wso2.carbon.policy.mgt.common.PolicyManagementException;
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import org.wso2.carbon.policy.mgt.core.cache.guava.GuavaPolicyCacheKey;
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import org.wso2.carbon.policy.mgt.core.mgt.PolicyManager;
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import org.wso2.carbon.policy.mgt.core.mgt.impl.PolicyManagerImpl;
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import java.util.*;
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import java.util.concurrent.TimeUnit;
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public class GuavaPolicyCacheBuilder {
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private static final Log log = LogFactory.getLog(GuavaPolicyCacheBuilder.class);
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private CacheLoader<GuavaPolicyCacheKey, Policy> cacheLoader;
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private CacheBuilder<Object, Object> cacheBuilder;
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public static final Policy NULL = new Policy();
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public GuavaPolicyCacheBuilder withCacheLoader() {
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cacheLoader = new CacheLoader<GuavaPolicyCacheKey, Policy>() {
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@Override
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public Policy load(GuavaPolicyCacheKey key) throws Exception {
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return singleLoad(key);
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}
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@Override
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public Map<GuavaPolicyCacheKey, Policy> loadAll(Iterable<? extends GuavaPolicyCacheKey> keys) throws Exception {
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return bulkLoad(keys);
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}
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};
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return this;
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}
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private Policy singleLoad(GuavaPolicyCacheKey key) throws PolicyManagementException {
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PolicyManager policyManager = new PolicyManagerImpl();
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Policy policy = policyManager.getPolicy(key.getPolicyId());
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if(policy == null) {
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return NULL;
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}
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return policy;
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}
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private Map<GuavaPolicyCacheKey, Policy> bulkLoad(Iterable<? extends GuavaPolicyCacheKey> keys) throws PolicyManagementException {
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PolicyManager policyManager = new PolicyManagerImpl();
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Map<GuavaPolicyCacheKey, Policy> cacheMap = new HashMap<>();
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for(GuavaPolicyCacheKey key : keys) {
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cacheMap.put(key, NULL);
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}
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List<Policy> policies = policyManager.getPolicies();
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for(Policy policy : policies) {
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GuavaPolicyCacheKey key = new GuavaPolicyCacheKey(policy.getId());
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cacheMap.put(key, policy);
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}
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return cacheMap;
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}
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public GuavaPolicyCacheBuilder withCacheBuilder() {
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// TODO : refactor to use configuration file
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cacheBuilder = CacheBuilder.newBuilder().
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maximumSize(GuavaPolicyCacheConstants.MAX_ENTRIES).
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expireAfterWrite(GuavaPolicyCacheConstants.EXPIRE_AFTER_WRITE_IN_MIN, TimeUnit.MINUTES);
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return this;
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}
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public LoadingCache<GuavaPolicyCacheKey, Policy> build() {
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return cacheBuilder.build(cacheLoader);
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}
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}
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@ -0,0 +1,7 @@
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package org.wso2.carbon.policy.mgt.core.cache.guava.utils;
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public final class GuavaPolicyCacheConstants {
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public static final long MAX_ENTRIES = 1000;
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public static final long EXPIRE_AFTER_WRITE_IN_MIN = 30;
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}
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