-Filters
--------
-
-A filter examine an event and decides if it matches or doesn't. Filters
-are mainly used in rules to decide if the processing entries should be
-executed on the given event. They're also used for settings, and systems
-like the Graph Correlator re-use Highland Park's filter mechanism to
-specify which alarms fit in a correlation. Some publishers may produce
-topics with a lot of volume and a subscriber may want only a portion of
-those messages. The subscriber can certainly filter messages after
-receiving them, but it may be substantially more efficient to ask the
-API server to filter the messages before sending them to the
-subscriber.The standard library includes a number of simple filters. The
-Equals filter, for example, compares a field's value with some other
-value and returns true if the values match. The standard library also
-includes filter classes called And, Or, and Not, so you can compose more
-complex filters. For example, written in the standard JSON config
-format:
-
-+-----------------------------------------+
-| "filter":{ |
-| "class":"And", |
-| "filters": |
-| [ |
-| { "class":"Equals", "foo":"abc" }, |
-| { "class":"Assigned", "field":"bar" } |
-| ] |
-| } |
-+-----------------------------------------+
-
-- This filter matches events in which the field "foo" has value "abc"
- and the field "bar" is assigned to some value (as opposed to not being
- present on the event). Filters are used by the consumers to filter out
- data and consume only specific set of data which matches the
- conditions mentioned in filter. Filters can be passed as a query
- parameter by the consumer in consume request as mentioned below:
- **http://localhost:8080/DMaaP/dmaaprest/events/DMaaP/consumergroup/mHOeNFY4XiWx4CBa?filter=\\{"class":"Equals",
- "field":"email", "value":"test@abc.com" }**
-- Filters can be applied only on data in JSON format i.e. if applied,
- filters will automatically ignore any non-json data. While consuming,
- request CONTENT\_TYPE is not relevant to filter.
-
-All the supported filter can be found below.
-
-Types of Filters
-================
-
-- DMaaP Message Router supports all the filters which were supported by
- DMaaP Message Router and are mentioned below:-
-- **All Alarms:**
- - Match all alarms.
-- **And:**
- - Create a set of filters. This filter matches when all of them matches.
-
-+-------------+--------------------+------------+---------------------+
-| **Field** | **Description** | **Type** | **Notes** |
-+=============+====================+============+=====================+
-| filters | Combined Filters | LIST | A list of filters |
-+-------------+--------------------+------------+---------------------+
-| | | | |
-+-------------+--------------------+------------+---------------------+
-
-- **Assigned:**
- - Choose a field from the event to check for assignment. This filter
- matches when the field is assigned.
-
-+-------------------+--------------------------------------------------------+------------+-----------------+
-| **Field** | **Description** | **Type** | **Notes** |
-+===================+========================================================+============+=================+
-| field | The field to check for on the event. | STRING | A field name |
-+-------------------+--------------------------------------------------------+------------+-----------------+
-| emptyIsAssigned | If true, an empty value is considered an assignment. | BOOLEAN | True or False |
-+-------------------+--------------------------------------------------------+------------+-----------------+
-
-- **Contains:**
- - Check if a search string contains another string.
-
-+-------------+---------------------------------------------------+------------+--------------+
-| **Field** | **Description** | **Type** | **Notes** |
-+=============+===================================================+============+==============+
-| String | The value to search. Supports ${} notation. | STRING | Any string |
-+-------------+---------------------------------------------------+------------+--------------+
-| Value | The value to search for. Supports ${} notation. | STRING | Any string |
-+-------------+---------------------------------------------------+------------+--------------+
-| | | | |
-+-------------+---------------------------------------------------+------------+--------------+
-
-- **EndsWith**:
- - Check if a search string ends with another string.
-
-+-------------+---------------------------------------------------+------------+--------------+
-| **Field** | **Description** | **Type** | **Notes** |
-+=============+===================================================+============+==============+
-| string | The value to search. Supports ${} notation. | STRING | Any string |
-+-------------+---------------------------------------------------+------------+--------------+
-| value | The value to search for. Supports ${} notation. | STRING | Any string |
-+-------------+---------------------------------------------------+------------+--------------+
-
-- **Equals:**
-
- - Choose a field from the event and a value to check for equality.
-
-+-------------+----------------------------------------------+------------+--------------+
-| **Field** | **Description** | **Type** | **Notes** |
-+=============+==============================================+============+==============+
-| field | The field to check. Supports ${} notation. | STRING | Any string |
-+-------------+----------------------------------------------+------------+--------------+
-| value | The value to match. Supports ${} notation. | STRING | Any string |
-+-------------+----------------------------------------------+------------+--------------+
-
-- **FlatironObjectExists**
-
- - Matches when the given object exists in the given Flatiron instance.
-
-+-------------+---------------------------------------------+------------+--------------+
-| **Field** | **Description** | **Type** | **Notes** |
-+=============+=============================================+============+==============+
-| oid | The OID of the object to look for. | STRING | Any string |
-+-------------+---------------------------------------------+------------+--------------+
-| flatiron | The name of the Flatiron client instance. | STRING | Any string |
-+-------------+---------------------------------------------+------------+--------------+
-
-- **IsAging**
- - Choose a field to test. This filter matches if the expression is
- numeric.
-
-+-------------+---------------------------------------------+------------+--------------+
-| **Field** | **Description** | **Type** | **Notes** |
-+=============+=============================================+============+==============+
-| field | The field to test. Supports ${} notation. | STRING | Any string |
-+-------------+---------------------------------------------+------------+--------------+
-
-- **IsNumeric**
- - Choose a field to test. This filter matches if the expression is
- numeric.
-
-+-------------+---------------------------------------------+------------+--------------+
-| **Field** | **Description** | **Type** | **Notes** |
-+=============+=============================================+============+==============+
-| field | The field to test. Supports ${} notation. | STRING | Any string |
-+-------------+---------------------------------------------+------------+--------------+
-
-- **MathCondition**
- - Choose a field from the event and a value for logical math conditions.
-
-+-------------+-------------------------------------------------+------------+-----------------------------------+
-| **Field** | **Description** | **Type** | **Notes** |
-+=============+=================================================+============+===================================+
-| Field | The field to check. Supports ${} notation. | STRING | Any string |
-+-------------+-------------------------------------------------+------------+-----------------------------------+
-| Value | The value to consider. Supports ${} notation. | STRING | Any string |
-+-------------+-------------------------------------------------+------------+-----------------------------------+
-| operator | The operation. | STRING | One of { "<=", ">=", ">", "<" } |
-+-------------+-------------------------------------------------+------------+-----------------------------------+
-| | | | |
-+-------------+-------------------------------------------------+------------+-----------------------------------+
-
-- **NoAlarms**
- - Don't match any alarms.
-- **Not**
- - Negate the configured filter.
-
-+-------------+-------------------------+------------+-------------+
-| **Field** | **Description** | **Type** | **Notes** |
-+=============+=========================+============+=============+
-| filter | The filter to negate. | FILTER | A filter |
-+-------------+-------------------------+------------+-------------+
-
-- **NotEqual**
- - Choose a field from the event and a value to check for inequality.
-
-+-------------+----------------------------------------------+------------+--------------+
-| **Field** | **Description** | **Type** | **Notes** |
-+=============+==============================================+============+==============+
-| field | The field to check. Supports ${} notation. | STRING | Any string |
-+-------------+----------------------------------------------+------------+--------------+
-| value | The value to match. Supports ${} notation. | STRING | Any string |
-+-------------+----------------------------------------------+------------+--------------+
-
-- **NotOneOf**
- - Match when the specified field does not have a value from the given list.
-
-+-------------+---------------------------------------------+------------+---------------------+
-| **Field** | **Description** | **Type** | **Notes** |
-+=============+=============================================+============+=====================+
-| field | The field to test. Supports ${} notation. | STRING | Any string |
-+-------------+---------------------------------------------+------------+---------------------+
-| values | The matching values. | LIST | A list of strings |
-+-------------+---------------------------------------------+------------+---------------------+
-
-- **OneOf**
- - Match when the specified field has a value from the given list.
-
-+-------------+---------------------------------------------+------------+---------------------+
-| **Field** | **Description** | **Type** | **Notes** |
-+=============+=============================================+============+=====================+
-| field | The field to test. Supports ${} notation. | STRING | Any string |
-+-------------+---------------------------------------------+------------+---------------------+
-| values | The matching values. | LIST | A list of strings |
-+-------------+---------------------------------------------+------------+---------------------+
-
-- **Or**
- - Create a set of filters. This filter matches when any one of them
- matches.
-
-+-------------+--------------------+------------+---------------------+
-| **Field** | **Description** | **Type** | **Notes** |
-+=============+====================+============+=====================+
-| filters | Combined Filters | LIST | A list of filters |
-+-------------+--------------------+------------+---------------------+
-
-- **RegEx**
- - Choose a field from the event to match against the regular expression
- you provide.
-
-+-------------+---------------------------------------------------------+------------+--------------+
-| **Field** | **Description** | **Type** | **Notes** |
-+=============+=========================================================+============+==============+
-| field | The text to check for a match. Supports ${} notation. | STRING | Any string |
-+-------------+---------------------------------------------------------+------------+--------------+
-| value | The regular expression (pattern) to match. | STRING | Any string |
-+-------------+---------------------------------------------------------+------------+--------------+
-
-- **StartsWith**
- - Check if a search string starts with another string.
-
-+-------------+---------------------------------------------------+------------+--------------+
-| **Field** | **Description** | **Type** | **Notes** |
-+=============+===================================================+============+==============+
-| string | The value to search. Supports ${} notation. | STRING | Any string |
-+-------------+---------------------------------------------------+------------+--------------+
-| Value | The value to search for. Supports ${} notation. | STRING | Any string |
-+-------------+---------------------------------------------------+------------+--------------+
-
-- **Unassigned**
- - Choose a field from the event to check for assignment. This filter
- matches when the field is not assigned.
-
-+-------------------+--------------------------------------------------------+------------+-----------------+
-| **Field** | **Description** | **Type** | **Notes** |
-+===================+========================================================+============+=================+
-| field | The field to check for on the event. | STRING | A field name |
-+-------------------+--------------------------------------------------------+------------+-----------------+
-| emptyIsAssigned | If true, an empty value is considered an assignment. | BOOLEAN | True or False |
-+-------------------+--------------------------------------------------------+------------+-----------------+
-
-- **WithinSecondsFrom**
- - This filter matches when the specified epoch time value is within the
- given number of seconds from the baseline time value. Both time values
- are assumed to be in seconds. If a value is in milliseconds, set
- baselineTimeInMillis and/or eventTimeInMillis to true.
-
-+------------------------+------------------------------------------------------------+------------+-----------------+
-| **Field** | **Description** | **Type** | **Notes** |
-+========================+============================================================+============+=================+
-| field | The time value to test. Supports ${} | STRING | A field name |
-+------------------------+------------------------------------------------------------+------------+-----------------+
-| eventTimeInMillis | Whether to convert the event value from milliseconds. | BOOLEAN | True or False |
-+------------------------+------------------------------------------------------------+------------+-----------------+
-| seconds | The number of seconds. | NUMBER | A number |
-+------------------------+------------------------------------------------------------+------------+-----------------+
-| baselineTimeInMillis | Whether to convert the baseline value from milliseconds. | BOOLEAN | True or False |
-+------------------------+------------------------------------------------------------+------------+-----------------+
-| baseline | The baseline time value. Supports ${}. | STRING | Any string |
-+------------------------+------------------------------------------------------------+------------+-----------------+
-
-- **WithinTimeFromNow**
- - This filter matches when the named field has an epoch time value
- within the given number of seconds from the current time. The event's
- time value is assumed to be in seconds. If it's in milliseconds, set
- eventTimeInMillis to true.
-
-+---------------------+---------------------------------------------------------+------------+-----------------+
-| **Field** | **Description** | **Type** | **Notes** |
-+=====================+=========================================================+============+=================+
-| field | The field to check on the event. | STRING | A field name |
-+---------------------+---------------------------------------------------------+------------+-----------------+
-| eventTimeInMillis | Whether to convert the event value from milliseconds. | BOOLEAN | True or False |
-+---------------------+---------------------------------------------------------+------------+-----------------+
-| seconds | The number of seconds. | NUMBER | A number |
-+---------------------+---------------------------------------------------------+------------+-----------------+
-
-- **Limit:**
-
- - Limit is the integer value and DMaaP Message Router will consumes
- only that set of message which are specified in limit.
-
- .. code:: bash
-
- Suppose if we set limit=2, then only 2 sets of data will be consumed.
- *Get \ **<<topicName>>/group/2?limit=4***
- Let us suppose if
- **No of data available** = 4
- **Set limit** = 6
- i.e. limit>no of data
- In this scenario all 4 sets of data will be consumed.
-
-- If limit is not passed with the url then by default limit is set to
- 4096.
-
- .. code:: bash
-
- i.e. 4096 sets of data will be consumed.
- **Timeout and Long Poll:**
-
-- Timeout is the integer value which will be treated by DMaaP Message
- Router as time in millisecond.
-
-
-
-- Get
-
-+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
-| `***http://localhost/DMaaP/dmaaprest/events/<<topicName>>/group/2?timeout=20000*** <http://localhost/DMaaP/dmaaprest/events/%3c%3ctopicName%3e%3e/group/2?timeout=20000>`__ |
-+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
-
-- If there is no data available to be consumed, then DMaaP Message
- Router will poll for the particular period of time specified in
- timeout this mechanism is known as Long Poll.
-
-- If timeout is not passed with url then DMaaP Message Router will set
- the value of timeout =10000
-
-- i.e. if no set of data are available then DMaaP Message Router will
- poll for 10000 ms.
-
-***Meta:***
-
-- Meta is a Boolean value.
-
-- DMaaP Message Router reads the value of meta from
- MRConfiguration.properties file at the time of startup.
-
-- If the value of meta is not null and if value of meta is one of these
- values true, yes, on, 1, y, checked then DMaaP Message Router will
- take meta flag as true, else it will be false.
-
-- If meta is set to true then consumer will get the value of message
- offset along with message.
-
- |image1|
-
- .. |image1| image:: images/image1.png
-
-- **Pretty**:
-
-- Pretty is a Boolean value.
-
-- DMaaP Message Router reads the value of pretty from
- MRConfiguration.properties file at the time of startup.
-
-- If the value of pretty is not null and if value of pretty is one of
- these values true, yes, on, 1, y, checked then DMaaP Message Router
- will take pretty flag as true, else it will be false.
-
-- If pretty is set to true then different sets of messages will be
- printed in next line separated by comma (,).
-
- |image2|
-
- .. |image2| image:: images/image2.png
-
-- **Filter**
-
- - A filter examine an event and decides if it matches or doesn't.
- - Filters are mainly used in rules to decide if the processing entries
- should be executed on the given event. They're also used for settings,
- and systems like the Graph Correlator re-use Highland Park's filter
- mechanism to specify which alarms fit in a correlation.
- - The standard library includes a number of simple filters. The Equals
- filter, for example, compares a field's value with some other value
- and returns true if the values match.
- - The standard library also includes filter classes called And, Or, and
- Not, so you can compose more complex filters. For example, written in
- the standard JSON config format:
-
- +-----------------------------------------+
- | "filter":{ |
- | "class":"And", |
- | "filters": |
- | [ |
- | { "class":"Equals", "foo":"abc" }, |
- | { "class":"Assigned", "field":"bar" } |
- | ] |
- | } |
- +-----------------------------------------+
-
- - This filter matches events in which the field "foo" has value "abc" and
- the field "bar" is assigned to some value (as opposed to not being
- present on the event).
- - Filters are used by the consumers to filter out data and consume only
- specific set of data which matches the conditions mentioned in filter.
- - Filters can be passed as a query parameter by the consumer in consume
- request as mentioned below:
- - **http://localhost:8080/DMaaP/dmaaprest/events/DMaaP/consumergroup/mHOeNFY4XiWx4CBa?filter=\\{"class":"Equals","field":"email", "value":"`test@abc.com <mailto:test@att.com>`__" }**
- - Filters can be applied only on data in JSON format i.e. if applied, filters will automatically ignore any non-json data.
- - While consuming, request CONTENT\_TYPE is not relevant to filter.
-
- The MR API allows a subscriber pass a Highland Park filter as part of
- the GET request. This will filter the stream of messages sent back to
- the subscriber, but for this to work, there are some requirements:
-
- - The message payload must be JSON
-
- - Only a filter built from Highland Park's Standard Library may be
- used. (The Cambria API server doesn't have access to plugged in
- filters.)
-
- - The filter must be encoded properly in the URL path.
-
-Server-side filtering can also be setup in the Java client as illustrated below
-
-**Filtering Consumer**
-
-You can also provide a Highland Park filter to your consumer instance,
-and this filter is passed on to the server in the GET request. One way
-to create the filter is programmatically. In your code, instantiate a
-filter from the Highland Park Standard Library Then create a String
-representation of the filter using the FilterIo.write utility. This
-String can then be passed to the Cambria client instance for use on the
-server.
-
-Remember, only Highland Park standard library filter components can be
-used -- no plug-ins are available in the Cambria server context.
-
- .. code:: bash
-
- package org.onap.sa.highlandPark.integration;
-
- import java.io.IOException;
-
- import java.util.UUID;
-
- import org.onap.nsa.cambria.client.CambriaClientFactory;
-
- import org.onap.nsa.cambria.client.CambriaConsumer;
-
- import org.onap.sa.highlandPark.processor.HpEvent;
-
- import org.onap.sa.highlandPark.stdlib.filters.FilterIo;
-
- import org.onap.sa.highlandPark.stdlib.filters.OneOf;
-
- public class ExampleFilteringConsumer
-
- {
-
- public static void main ( String[] args ) throws IOException,
- InterruptedException
-
- {
-
- // Cambria clients take a set of 1 or more servers to use in round-robin
- fashion.
-
- // If a server becomes unreachable, another in the group is used.
-
- final String
- serverGroup="ueb01hydc.it.att.com,ueb02hydc.it.att.com,ueb03hydc.it.att.com";
-
- // choose a topic
-
- final String topic = "TEST-TOPIC";
-
- // Cambria clients can run in a cooperative group to handle high-volume
- topics.
-
- // Here, we create a random group name, which means this client is not
- re-startable.
-
- final String consumerGroup = UUID.randomUUID ().toString ();
-
- final String consumerId = "0";
-
- // Cambria clients can sit in a tight loop on the client side, using a
- long-poll
-
- // to wait for messages, and a limit to tell the server the most to send
- at a time.
-
- final int longPollMs = 30\*1000;
-
- final int limit = -1;
-
- // The Cambria server can filter the returned message stream using
- filters from the
-
- // Highland Park system. Here, we create a simple filter to test for the
- AlarmID
-
- // value being one of the Mobility power alarms.
-
- final OneOf oneOf = new OneOf ( "AlarmId", kPowerAlarms );
-
- // create the consumer
-
- final CambriaConsumer cc = CambriaClientFactory.createConsumer (
- serverGroup, topic,
-
- consumerGroup, consumerId, longPollMs, limit, FilterIo.write ( oneOf )
- );
-
- // now loop reading messages. Note that cc.fetch() will wait in its HTTP
- receive
-
- // method for up to 30 seconds (longPollMs) when nothing's available at
- the server.
-
- long count = 0;
-
- while ( true )
-
- {
-
- for ( String msg : cc.fetch () )
-
- {
-
- System.out.println ( "" + (++count) + ": " + msg );
-
- }
-
- }
-
- }
-
- private static final String[] kPowerAlarms =
-
- {
-
- "HUB COMMERCIAL POWER FAIL\_FWD",
-
- "HUB COMMERCIAL POWER FAIL",
-
- "RBS COMMERCIAL POWER FAIL - Fixed\_FWD",
-
- "RBS COMMERCIAL POWER FAIL\_FWD",
-
- "RBS COMMERCIAL POWER FAIL - No Generator\_FWD",
-
- "RBS COMMERCIAL POWER FAIL - Portable\_FWD",
-
- "RBS COMMERCIAL POWER FAIL - Shared\_FWD",
-
- "RBS COMMERCIAL POWER FAIL - Yes\_FWD",
-
- "RBS COMMERCIAL POWER FAIL - YES\_FWD",
-
- "RBS COMMERCIAL POWER FAIL - Fixed",
-
- "RBS COMMERCIAL POWER FAIL - No Generator",
-
- "RBS COMMERCIAL POWER FAIL - Portable",
-
- "RBS COMMERCIAL POWER FAIL - Shared",
-
- "RBS COMMERCIAL POWER FAIL - YES",
-
- "RBS COMMERCIAL POWER FAIL - Yes",
-
- "RBS COMMERCIAL POWER FAIL",
-
- "HUB COMMERCIAL POWER FAIL - Fixed",
-
- "HUB COMMERCIAL POWER FAIL - No Generator",
-
- "HUB COMMERCIAL POWER FAIL - Portable",
-
- "HUB COMMERCIAL POWER FAIL - Shared",
-
- "HUB COMMERCIAL POWER FAIL - Fixed\_FWD",
-
- "HUB COMMERCIAL POWER FAIL - No Generator\_FWD",
-
- "HUB COMMERCIAL POWER FAIL - Portable\_FWD",
-
- "HUB COMMERCIAL POWER FAIL - Shared\_FWD",
-
- };
-
- }
-
-
-
-**Filter Builder**
-
- MR server-side filtering allows a consumer to filter the stream of
- messages returned from the GET call. The following link provide details
- of building some of the filter to illustrate Filter Builder. It is not
- meant to cover and provide examples of every filter
-
Code Review / dmaap / messagerouter / messageservice.git / commitdiff