Github user robertgmoss commented on a diff in the pull request:

    https://github.com/apache/brooklyn-server/pull/723#discussion_r120929497
  
    --- Diff: 
locations/jclouds/src/main/java/org/apache/brooklyn/location/jclouds/AbstractComputeServiceRegistry.java
 ---
    @@ -0,0 +1,283 @@
    +/*
    + * 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.brooklyn.location.jclouds;
    +
    +import static com.google.common.base.Preconditions.checkNotNull;
    +import static org.apache.brooklyn.util.JavaGroovyEquivalents.groovyTruth;
    +import static 
org.jclouds.aws.ec2.reference.AWSEC2Constants.PROPERTY_EC2_AMI_QUERY;
    +import static 
org.jclouds.aws.ec2.reference.AWSEC2Constants.PROPERTY_EC2_CC_AMI_QUERY;
    +
    +import java.util.Map;
    +import java.util.Properties;
    +import java.util.concurrent.ConcurrentHashMap;
    +
    +import org.apache.brooklyn.core.config.Sanitizer;
    +import org.apache.brooklyn.core.location.cloud.CloudLocationConfig;
    +import 
org.apache.brooklyn.core.mgmt.persist.DeserializingJcloudsRenamesProvider;
    +import org.apache.brooklyn.util.collections.MutableMap;
    +import org.apache.brooklyn.util.core.config.ConfigBag;
    +import org.apache.brooklyn.util.text.Strings;
    +import org.apache.brooklyn.util.time.Duration;
    +import org.jclouds.Constants;
    +import org.jclouds.ContextBuilder;
    +import org.jclouds.azurecompute.arm.config.AzureComputeRateLimitModule;
    +import org.jclouds.compute.ComputeService;
    +import org.jclouds.compute.ComputeServiceContext;
    +import org.jclouds.domain.Credentials;
    +import org.jclouds.ec2.reference.EC2Constants;
    +import org.jclouds.encryption.bouncycastle.config.BouncyCastleCryptoModule;
    +import org.jclouds.location.reference.LocationConstants;
    +import org.jclouds.logging.slf4j.config.SLF4JLoggingModule;
    +import org.jclouds.sshj.config.SshjSshClientModule;
    +import org.slf4j.Logger;
    +import org.slf4j.LoggerFactory;
    +
    +import com.google.common.base.Predicates;
    +import com.google.common.base.Supplier;
    +import com.google.common.collect.ImmutableSet;
    +import com.google.common.collect.Maps;
    +import com.google.inject.Module;
    +
    +public abstract class AbstractComputeServiceRegistry implements 
ComputeServiceRegistry, JcloudsLocationConfig {
    +
    +    private static final Logger LOG = 
LoggerFactory.getLogger(AbstractComputeServiceRegistry.class);
    +
    +    private final Map<Map<?, ?>, ComputeService> cachedComputeServices = 
new ConcurrentHashMap<>();
    +
    +    @Override
    +    public ComputeService findComputeService(ConfigBag conf, boolean 
allowReuse) {
    +        PropertiesBuilder propertiesBuilder = new PropertiesBuilder(conf)
    +                .setCommonProperties();
    +
    +        Iterable<Module> modules = getCommonModules();
    +
    +        // Enable aws-ec2 lazy image fetching, if given a specific 
imageId; otherwise customize for specific owners; or all as a last resort
    +        // See https://issues.apache.org/jira/browse/WHIRR-416
    +        String provider = getProviderFromConfig(conf);
    +        if ("aws-ec2".equals(provider)) {
    +            propertiesBuilder.setAWSEC2Properties();
    +        } else if ("azurecompute-arm".equals(provider)) {
    +            propertiesBuilder.setAzureComputeArmProperties();
    +            // jclouds 2.0.0 does not include the rate limit module for 
Azure ARM. This quick fix enables this which will
    +            // avoid provisioning to fail due to rate limit exceeded
    +            // See https://issues.apache.org/jira/browse/JCLOUDS-1229
    +            modules = ImmutableSet.<Module>builder()
    +                    .addAll(modules)
    +                    .add(new AzureComputeRateLimitModule())
    +                    .build();
    +        }
    +
    +        Properties properties = propertiesBuilder
    +                .setJCloudsProperties()
    +                .setEndpointProperty()
    +                .build();
    +
    +        Supplier<ComputeService> computeServiceSupplier =  new 
ComputeServiceSupplier(conf, modules, properties);
    +        if (allowReuse) {
    +            return 
cachedComputeServices.computeIfAbsent(makeCacheKey(conf, properties), key -> 
computeServiceSupplier.get());
    +        }
    +        return computeServiceSupplier.get();
    +    }
    +
    +    private Map<?, ?> makeCacheKey(ConfigBag conf, Properties properties) {
    +        String provider = getProviderFromConfig(conf);
    +        String identity = 
checkNotNull(conf.get(CloudLocationConfig.ACCESS_IDENTITY), "identity must not 
be null");
    +        String credential = 
checkNotNull(conf.get(CloudLocationConfig.ACCESS_CREDENTIAL), "credential must 
not be null");
    +        String endpoint = 
properties.getProperty(Constants.PROPERTY_ENDPOINT);
    +        return MutableMap.builder()
    +                .putAll(properties)
    +                .put("provider", provider)
    +                .put("identity", identity)
    +                .put("credential", credential)
    +                .putIfNotNull("endpoint", endpoint)
    +                .build()
    +                .asUnmodifiable();
    +    }
    +
    +    public class PropertiesBuilder {
    +        private ConfigBag conf;
    +        private Properties properties = new Properties();
    +
    +        public PropertiesBuilder(ConfigBag conf) {
    +            this.conf = conf;
    +        }
    +
    +        public PropertiesBuilder setCommonProperties() {
    +            properties.setProperty(Constants.PROPERTY_TRUST_ALL_CERTS, 
Boolean.toString(true));
    +            properties.setProperty(Constants.PROPERTY_RELAX_HOSTNAME, 
Boolean.toString(true));
    +            properties.setProperty("jclouds.ssh.max-retries", 
conf.getStringKey("jclouds.ssh.max-retries") != null ?
    +                    
conf.getStringKey("jclouds.ssh.max-retries").toString() : "50");
    +
    +            if (conf.get(OAUTH_ENDPOINT) != null)
    +                properties.setProperty(OAUTH_ENDPOINT.getName(), 
conf.get(OAUTH_ENDPOINT));
    +
    +            // See https://issues.apache.org/jira/browse/BROOKLYN-394
    +            // For retries, the backoff times are:
    +            //   Math.min(2^failureCount * retryDelayStart, 
retryDelayStart * 10) + random(10%)
    +            // Therefore the backoff times will be: 500ms, 1s, 2s, 4s, 5s, 
5s.
    +            // The defaults (if not overridden here) are 50ms and 5 
retires. This gives backoff
    +            // times of 50ms, 100ms, 200ms, 400ms, 500ms (so a total 
backoff time of 1.25s),
    +            // which is not long when you're being rate-limited and there 
are multiple thread all
    +            // retrying their API calls.
    +            properties.setProperty(Constants.PROPERTY_RETRY_DELAY_START, 
"500");
    +            properties.setProperty(Constants.PROPERTY_MAX_RETRIES, "6");
    +            return this;
    +        }
    +
    +        public PropertiesBuilder setAWSEC2Properties() {
    +            // TODO convert AWS-only flags to config keys
    +            if (groovyTruth(conf.get(IMAGE_ID))) {
    +                properties.setProperty(PROPERTY_EC2_AMI_QUERY, "");
    +                properties.setProperty(PROPERTY_EC2_CC_AMI_QUERY, "");
    +            } else if (groovyTruth(conf.getStringKey("imageOwner"))) {
    +                properties.setProperty(PROPERTY_EC2_AMI_QUERY, "owner-id=" 
+ conf.getStringKey("imageOwner") + ";state=available;image-type=machine");
    +            } else if (groovyTruth(conf.getStringKey("anyOwner"))) {
    +                // set `anyOwner: true` to override the default query 
(which is restricted to certain owners as per below),
    +                // allowing the AMI query to bind to any machine
    +                // (note however, we sometimes pick defaults in 
JcloudsLocationFactory);
    +                // (and be careful, this can give a LOT of data back, 
taking several minutes,
    +                // and requiring extra memory allocated on the 
command-line)
    +                properties.setProperty(PROPERTY_EC2_AMI_QUERY, 
"state=available;image-type=machine");
    +                /*
    +                 * by default the following filters are applied:
    +                 * Filter.1.Name=owner-id&Filter.1.Value.1=137112412989&
    +                 * Filter.1.Value.2=063491364108&
    +                 * Filter.1.Value.3=099720109477&
    +                 * Filter.1.Value.4=411009282317&
    +                 * Filter.2.Name=state&Filter.2.Value.1=available&
    +                 * Filter.3.Name=image-type&Filter.3.Value.1=machine&
    +                 */
    +            }
    +
    +            // See https://issues.apache.org/jira/browse/BROOKLYN-399
    +            String region = conf.get(CLOUD_REGION_ID);
    +            if (Strings.isNonBlank(region)) {
    +                /*
    +                 * Drop availability zone suffixes. Without this 
deployments to regions like us-east-1b fail
    +                 * because jclouds throws an IllegalStateException 
complaining that: location id us-east-1b
    +                 * not found in: [{scope=PROVIDER, id=aws-ec2, 
description=https://ec2.us-east-1.amazonaws.com,
    +                 * iso3166Codes=[US-VA, US-CA, US-OR, BR-SP, IE, DE-HE, 
SG, AU-NSW, JP-13]}]. The exception is
    +                 * thrown by 
org.jclouds.compute.domain.internal.TemplateBuilderImpl#locationId(String).
    +                 */
    +                if (Character.isLetter(region.charAt(region.length() - 
1))) {
    +                    region = region.substring(0, region.length() - 1);
    +                }
    +                properties.setProperty(LocationConstants.PROPERTY_REGIONS, 
region);
    +            }
    +
    +            // occasionally can get 
com.google.common.util.concurrent.UncheckedExecutionException: 
java.lang.RuntimeException:
    +            //     security group 
eu-central-1/jclouds#brooklyn-bxza-alex-eu-central-shoul-u2jy-nginx-ielm is not 
available after creating
    +            // the default timeout was 500ms so let's raise it in case 
that helps
    +            
properties.setProperty(EC2Constants.PROPERTY_EC2_TIMEOUT_SECURITYGROUP_PRESENT, 
"" + Duration.seconds(30).toMilliseconds());
    +            return this;
    +        }
    +
    +        private PropertiesBuilder setAzureComputeArmProperties() {
    +            String region = conf.get(CLOUD_REGION_ID);
    +            if (Strings.isNonBlank(region)) {
    +                properties.setProperty(LocationConstants.PROPERTY_REGIONS, 
region);
    +            }
    +            return this;
    +        }
    +
    +        private PropertiesBuilder setJCloudsProperties() {
    +            // Add extra jclouds-specific configuration
    +            Map<String, Object> extra = 
Maps.filterKeys(conf.getAllConfig(), Predicates.containsPattern("^jclouds\\."));
    +            if (extra.size() > 0) {
    +                String provider = getProviderFromConfig(conf);
    +                LOG.debug("Configuring custom jclouds property overrides 
for {}: {}", provider, Sanitizer.sanitize(extra));
    +            }
    +            properties.putAll(Maps.filterValues(extra, 
Predicates.notNull()));
    +            return this;
    +        }
    +
    +        private PropertiesBuilder setEndpointProperty() {
    +            String endpoint = conf.get(CloudLocationConfig.CLOUD_ENDPOINT);
    +            if (!groovyTruth(endpoint)) endpoint = 
getDeprecatedProperty(conf, Constants.PROPERTY_ENDPOINT);
    +            if (groovyTruth(endpoint)) 
properties.setProperty(Constants.PROPERTY_ENDPOINT, endpoint);
    +            return this;
    +        }
    +
    +        public Properties build() {
    +            return properties;
    +        }
    +    }
    +
    +    public class ComputeServiceSupplier implements 
Supplier<ComputeService> {
    +
    +        private final String provider;
    +        private final ConfigBag conf;
    +        private final Iterable<? extends Module> modules;
    +        private final Properties properties;
    +
    +        private final Object createComputeServicesMutex = new Object();
    +
    +        public ComputeServiceSupplier(ConfigBag conf, Iterable<? extends 
Module> modules, Properties properties) {
    +            this.provider = getProviderFromConfig(conf);
    +            this.conf = conf;
    +            this.modules = modules;
    +            this.properties = properties;
    +        }
    +
    +        public ComputeService get() {
    +            // Synchronizing to avoid deadlock from 
sun.reflect.annotation.AnnotationType.
    +            // See https://github.com/brooklyncentral/brooklyn/issues/974
    +            synchronized (createComputeServicesMutex) {
    --- End diff --
    
    @aledsage would you mind taking a look at this?  I agree with @andreaturli 
that it is probably no longer required, but then, I don't really understand the 
threading model that cause this deadlock in the first place.


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