Copy policy-endpoints from drools-pdp to common

Removed changes made in commit b40acf2d244058c162a8597968e59f2708e6abf4
that went beyond the scope of POLICY-967

Issue-ID: POLICY-967
Change-Id: Ibbf78540dec8bf8601a62dacc8c7056d43f70ba1
Signed-off-by: mmis <michael.morris@ericsson.com>

1 files changed, 438 insertions, 0 deletions

diff --git a/policy-endpoints/src/main/java/org/onap/policy/common/endpoints/event/comm/TopicEndpoint.java b/policy-endpoints/src/main/java/org/onap/policy/common/endpoints/event/comm/TopicEndpoint.java
index 03e6776a..e7a21ca1 100644
--- a/policy-endpoints/src/main/java/org/onap/policy/common/endpoints/event/comm/TopicEndpoint.java
+++ b/policy-endpoints/src/main/java/org/onap/policy/common/endpoints/event/comm/TopicEndpoint.java
@@ -20,6 +20,9 @@
 
 package org.onap.policy.common.endpoints.event.comm;
 
+import com.fasterxml.jackson.annotation.JsonIgnore;
+
+import java.util.ArrayList;
 import java.util.List;
 import java.util.Properties;
 
@@ -30,6 +33,8 @@ import org.onap.policy.common.endpoints.event.comm.bus.DmaapTopicSource;
 import org.onap.policy.common.endpoints.event.comm.bus.NoopTopicSink;
 import org.onap.policy.common.endpoints.event.comm.bus.UebTopicSink;
 import org.onap.policy.common.endpoints.event.comm.bus.UebTopicSource;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 /**
  * Abstraction to managed the system's Networked Topic Endpoints, sources of all events input into
@@ -38,6 +43,11 @@ import org.onap.policy.common.endpoints.event.comm.bus.UebTopicSource;
 public interface TopicEndpoint extends Startable, Lockable {
 
     /**
+     * singleton for global access
+     */
+    public static final TopicEndpoint manager = new ProxyTopicEndpointManager();
+
+    /**
      * Add Topic Sources to the communication infrastructure initialized per properties
      *
      * @param properties properties for Topic Source construction
@@ -227,3 +237,431 @@ public interface TopicEndpoint extends Startable, Lockable {
      */
     public List<NoopTopicSink> getNoopTopicSinks();
 }
+
+
+/*
+ * ----------------- implementation -------------------
+ */
+
+/**
+ * This implementation of the Topic Endpoint Manager, proxies operations to appropriate
+ * implementations according to the communication infrastructure that are supported
+ */
+class ProxyTopicEndpointManager implements TopicEndpoint {
+    /**
+     * Logger
+     */
+    private static Logger logger = LoggerFactory.getLogger(ProxyTopicEndpointManager.class);
+    /**
+     * Is this element locked?
+     */
+    protected volatile boolean locked = false;
+
+    /**
+     * Is this element alive?
+     */
+    protected volatile boolean alive = false;
+
+    @Override
+    public List<TopicSource> addTopicSources(Properties properties) {
+
+        // 1. Create UEB Sources
+        // 2. Create DMAAP Sources
+
+        final List<TopicSource> sources = new ArrayList<>();
+
+        sources.addAll(UebTopicSource.factory.build(properties));
+        sources.addAll(DmaapTopicSource.factory.build(properties));
+
+        if (this.isLocked()) {
+            for (final TopicSource source : sources) {
+                source.lock();
+            }
+        }
+
+        return sources;
+    }
+
+    @Override
+    public List<TopicSink> addTopicSinks(Properties properties) {
+        // 1. Create UEB Sinks
+        // 2. Create DMAAP Sinks
+
+        final List<TopicSink> sinks = new ArrayList<>();
+
+        sinks.addAll(UebTopicSink.factory.build(properties));
+        sinks.addAll(DmaapTopicSink.factory.build(properties));
+        sinks.addAll(NoopTopicSink.factory.build(properties));
+
+        if (this.isLocked()) {
+            for (final TopicSink sink : sinks) {
+                sink.lock();
+            }
+        }
+
+        return sinks;
+    }
+
+    @Override
+    public List<TopicSource> getTopicSources() {
+
+        final List<TopicSource> sources = new ArrayList<>();
+
+        sources.addAll(UebTopicSource.factory.inventory());
+        sources.addAll(DmaapTopicSource.factory.inventory());
+
+        return sources;
+    }
+
+    @Override
+    public List<TopicSink> getTopicSinks() {
+
+        final List<TopicSink> sinks = new ArrayList<>();
+
+        sinks.addAll(UebTopicSink.factory.inventory());
+        sinks.addAll(DmaapTopicSink.factory.inventory());
+        sinks.addAll(NoopTopicSink.factory.inventory());
+
+        return sinks;
+    }
+
+    @JsonIgnore
+    @Override
+    public List<UebTopicSource> getUebTopicSources() {
+        return UebTopicSource.factory.inventory();
+    }
+
+    @JsonIgnore
+    @Override
+    public List<DmaapTopicSource> getDmaapTopicSources() {
+        return DmaapTopicSource.factory.inventory();
+    }
+
+    @JsonIgnore
+    @Override
+    public List<UebTopicSink> getUebTopicSinks() {
+        return UebTopicSink.factory.inventory();
+    }
+
+    @JsonIgnore
+    @Override
+    public List<DmaapTopicSink> getDmaapTopicSinks() {
+        return DmaapTopicSink.factory.inventory();
+    }
+
+    @JsonIgnore
+    @Override
+    public List<NoopTopicSink> getNoopTopicSinks() {
+        return NoopTopicSink.factory.inventory();
+    }
+
+    @Override
+    public boolean start() {
+
+        synchronized (this) {
+            if (this.locked) {
+                throw new IllegalStateException(this + " is locked");
+            }
+
+            if (this.alive) {
+                return true;
+            }
+
+            this.alive = true;
+        }
+
+        final List<Startable> endpoints = this.getEndpoints();
+
+        boolean success = true;
+        for (final Startable endpoint : endpoints) {
+            try {
+                success = endpoint.start() && success;
+            } catch (final Exception e) {
+                success = false;
+                logger.error("Problem starting endpoint: {}", endpoint, e);
+            }
+        }
+
+        return success;
+    }
+
+
+    @Override
+    public boolean stop() {
+
+        /*
+         * stop regardless if it is locked, in other words, stop operation has precedence over
+         * locks.
+         */
+        synchronized (this) {
+            this.alive = false;
+        }
+
+        final List<Startable> endpoints = this.getEndpoints();
+
+        boolean success = true;
+        for (final Startable endpoint : endpoints) {
+            try {
+                success = endpoint.stop() && success;
+            } catch (final Exception e) {
+                success = false;
+                logger.error("Problem stopping endpoint: {}", endpoint, e);
+            }
+        }
+
+        return success;
+    }
+
+    /**
+     *
+     * @return list of managed endpoints
+     */
+    @JsonIgnore
+    protected List<Startable> getEndpoints() {
+        final List<Startable> endpoints = new ArrayList<>();
+
+        endpoints.addAll(this.getTopicSources());
+        endpoints.addAll(this.getTopicSinks());
+
+        return endpoints;
+    }
+
+    @Override
+    public void shutdown() {
+        UebTopicSource.factory.destroy();
+        UebTopicSink.factory.destroy();
+        NoopTopicSink.factory.destroy();
+
+        DmaapTopicSource.factory.destroy();
+        DmaapTopicSink.factory.destroy();
+    }
+
+    @Override
+    public boolean isAlive() {
+        return this.alive;
+    }
+
+    @Override
+    public boolean lock() {
+
+        synchronized (this) {
+            if (this.locked) {
+                return true;
+            }
+
+            this.locked = true;
+        }
+
+        for (final TopicSource source : this.getTopicSources()) {
+            source.lock();
+        }
+
+        for (final TopicSink sink : this.getTopicSinks()) {
+            sink.lock();
+        }
+
+        return true;
+    }
+
+    @Override
+    public boolean unlock() {
+        synchronized (this) {
+            if (!this.locked) {
+                return true;
+            }
+
+            this.locked = false;
+        }
+
+        for (final TopicSource source : this.getTopicSources()) {
+            source.unlock();
+        }
+
+        for (final TopicSink sink : this.getTopicSinks()) {
+            sink.unlock();
+        }
+
+        return true;
+    }
+
+    @Override
+    public boolean isLocked() {
+        return this.locked;
+    }
+
+    @Override
+    public List<TopicSource> getTopicSources(List<String> topicNames) {
+
+        if (topicNames == null) {
+            throw new IllegalArgumentException("must provide a list of topics");
+        }
+
+        final List<TopicSource> sources = new ArrayList<>();
+        for (final String topic : topicNames) {
+            try {
+                final TopicSource uebSource = this.getUebTopicSource(topic);
+                if (uebSource != null) {
+                    sources.add(uebSource);
+                }
+            } catch (final Exception e) {
+                logger.debug("No UEB source for topic: {}", topic, e);
+            }
+
+            try {
+                final TopicSource dmaapSource = this.getDmaapTopicSource(topic);
+                if (dmaapSource != null) {
+                    sources.add(dmaapSource);
+                }
+            } catch (final Exception e) {
+                logger.debug("No DMAAP source for topic: {}", topic, e);
+            }
+        }
+        return sources;
+    }
+
+    @Override
+    public List<TopicSink> getTopicSinks(List<String> topicNames) {
+
+        if (topicNames == null) {
+            throw new IllegalArgumentException("must provide a list of topics");
+        }
+
+        final List<TopicSink> sinks = new ArrayList<>();
+        for (final String topic : topicNames) {
+            try {
+                final TopicSink uebSink = this.getUebTopicSink(topic);
+                if (uebSink != null) {
+                    sinks.add(uebSink);
+                }
+            } catch (final Exception e) {
+                logger.debug("No UEB sink for topic: {}", topic, e);
+            }
+
+            try {
+                final TopicSink dmaapSink = this.getDmaapTopicSink(topic);
+                if (dmaapSink != null) {
+                    sinks.add(dmaapSink);
+                }
+            } catch (final Exception e) {
+                logger.debug("No DMAAP sink for topic: {}", topic, e);
+            }
+
+            try {
+                final TopicSink noopSink = this.getNoopTopicSink(topic);
+                if (noopSink != null) {
+                    sinks.add(noopSink);
+                }
+            } catch (final Exception e) {
+                logger.debug("No NOOP sink for topic: {}", topic, e);
+            }
+        }
+        return sinks;
+    }
+
+    @Override
+    public TopicSource getTopicSource(Topic.CommInfrastructure commType, String topicName) {
+
+        if (commType == null) {
+            throw parmException(topicName);
+        }
+
+        if (topicName == null) {
+            throw parmException(topicName);
+        }
+
+        switch (commType) {
+            case UEB:
+                return this.getUebTopicSource(topicName);
+            case DMAAP:
+                return this.getDmaapTopicSource(topicName);
+            default:
+                throw new UnsupportedOperationException("Unsupported " + commType.name());
+        }
+    }
+
+    private IllegalArgumentException parmException(String topicName) {
+        return new IllegalArgumentException(
+                "Invalid parameter: a communication infrastructure required to fetch " + topicName);
+    }
+
+    @Override
+    public TopicSink getTopicSink(Topic.CommInfrastructure commType, String topicName) {
+        if (commType == null) {
+            throw parmException(topicName);
+        }
+
+        if (topicName == null) {
+            throw parmException(topicName);
+        }
+
+        switch (commType) {
+            case UEB:
+                return this.getUebTopicSink(topicName);
+            case DMAAP:
+                return this.getDmaapTopicSink(topicName);
+            case NOOP:
+                return this.getNoopTopicSink(topicName);
+            default:
+                throw new UnsupportedOperationException("Unsupported " + commType.name());
+        }
+    }
+
+    @Override
+    public List<TopicSink> getTopicSinks(String topicName) {
+        if (topicName == null) {
+            throw parmException(topicName);
+        }
+
+        final List<TopicSink> sinks = new ArrayList<>();
+
+        try {
+            sinks.add(this.getUebTopicSink(topicName));
+        } catch (final Exception e) {
+            logNoSink(topicName, e);
+        }
+
+        try {
+            sinks.add(this.getDmaapTopicSink(topicName));
+        } catch (final Exception e) {
+            logNoSink(topicName, e);
+        }
+
+        try {
+            sinks.add(this.getNoopTopicSink(topicName));
+        } catch (final Exception e) {
+            logNoSink(topicName, e);
+        }
+
+        return sinks;
+    }
+
+    private void logNoSink(String topicName, Exception ex) {
+        logger.debug("No sink for topic: {}", topicName, ex);
+    }
+
+    @Override
+    public UebTopicSource getUebTopicSource(String topicName) {
+        return UebTopicSource.factory.get(topicName);
+    }
+
+    @Override
+    public UebTopicSink getUebTopicSink(String topicName) {
+        return UebTopicSink.factory.get(topicName);
+    }
+
+    @Override
+    public DmaapTopicSource getDmaapTopicSource(String topicName) {
+        return DmaapTopicSource.factory.get(topicName);
+    }
+
+    @Override
+    public DmaapTopicSink getDmaapTopicSink(String topicName) {
+        return DmaapTopicSink.factory.get(topicName);
+    }
+
+    @Override
+    public NoopTopicSink getNoopTopicSink(String topicName) {
+        return NoopTopicSink.factory.get(topicName);
+    }
+
+}