diff --git a/rally/common/utils.py b/rally/common/utils.py
index d9246d46c8..de417c0695 100644
--- a/rally/common/utils.py
+++ b/rally/common/utils.py
@@ -78,6 +78,8 @@ class StdErrCapture(object):
 
 
 class Timer(object):
+    """Timer based on context manager interface."""
+
     def __enter__(self):
         self.error = None
         self.start = time.time()
@@ -86,6 +88,9 @@ class Timer(object):
     def timestamp(self):
         return self.start
 
+    def finish_timestamp(self):
+        return self.finish
+
     def __exit__(self, type, value, tb):
         self.finish = time.time()
         if type:
@@ -652,4 +657,54 @@ def format_float_to_str(num):
 
     num_str = "%f" % num
     float_part = num_str.split(".")[1].rstrip("0") or "0"
-    return num_str.split(".")[0] + "." + float_part
\ No newline at end of file
+    return num_str.split(".")[0] + "." + float_part
+
+
+class DequeAsQueue(object):
+    """Allows to use some of Queue methods on collections.deque."""
+
+    def __init__(self, deque):
+        self.deque = deque
+
+    def qsize(self):
+        return len(self.deque)
+
+    def put(self, value):
+        self.deque.append(value)
+
+    def get(self):
+        return self.deque.popleft()
+
+    def empty(self):
+        return bool(self.deque)
+
+
+class Stopwatch(object):
+    """Allows to sleep till specified time since start."""
+
+    def __init__(self, stop_event=None):
+        """Creates Stopwatch.
+
+        :param stop_event: optional threading.Event to use for waiting
+            allows to interrupt sleep. If not provided time.sleep
+            will be used instead.
+        """
+        self._stop_event = stop_event
+
+    def start(self):
+        self._start_time = time.time()
+
+    def sleep(self, sec):
+        """Sleeps till specified second since start."""
+        target_time = self._start_time + sec
+        current_time = time.time()
+        if current_time >= target_time:
+            return
+        time_to_sleep = target_time - current_time
+        self._sleep(time_to_sleep)
+
+    def _sleep(self, sec):
+        if self._stop_event:
+            self._stop_event.wait(sec)
+        else:
+            interruptable_sleep(sec)
diff --git a/rally/plugins/common/trigger/__init__.py b/rally/plugins/common/trigger/__init__.py
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/rally/plugins/common/trigger/event.py b/rally/plugins/common/trigger/event.py
new file mode 100644
index 0000000000..c8bcc7d775
--- /dev/null
+++ b/rally/plugins/common/trigger/event.py
@@ -0,0 +1,67 @@
+# Copyright 2016: Mirantis 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.
+
+from rally import consts
+from rally.task import trigger
+
+
+@trigger.configure(name="event")
+class EventTrigger(trigger.Trigger):
+    """Triggers hook on specified event and list of values."""
+
+    CONFIG_SCHEMA = {
+        "type": "object",
+        "$schema": consts.JSON_SCHEMA,
+        "oneOf": [
+            {
+                "properties": {
+                    "unit": {"enum": ["time"]},
+                    "at": {
+                        "type": "array",
+                        "minItems": 1,
+                        "uniqueItems": True,
+                        "items": {
+                            "type": "integer",
+                            "minimum": 0,
+                        }
+                    },
+                },
+                "required": ["unit", "at"],
+                "additionalProperties": False,
+            },
+            {
+                "properties": {
+                    "unit": {"enum": ["iteration"]},
+                    "at": {
+                        "type": "array",
+                        "minItems": 1,
+                        "uniqueItems": True,
+                        "items": {
+                            "type": "integer",
+                            "minimum": 1,
+                        }
+                    },
+                },
+                "required": ["unit", "at"],
+                "additionalProperties": False,
+            },
+        ]
+    }
+
+    def get_configured_event_type(self):
+        return self.config["unit"]
+
+    def is_runnable(self, value):
+        return value in self.config["at"]
diff --git a/rally/task/trigger.py b/rally/task/trigger.py
new file mode 100644
index 0000000000..6c56305c33
--- /dev/null
+++ b/rally/task/trigger.py
@@ -0,0 +1,45 @@
+# Copyright 2016: Mirantis 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.
+
+import abc
+
+import jsonschema
+import six
+
+from rally.common.plugin import plugin
+
+configure = plugin.configure
+
+
+@plugin.base()
+@six.add_metaclass(abc.ABCMeta)
+class Trigger(plugin.Plugin):
+    """Factory for trigger classes."""
+
+    @classmethod
+    def validate(cls, config):
+        trigger_schema = cls.get(config["name"]).CONFIG_SCHEMA
+        jsonschema.validate(config["args"], trigger_schema)
+
+    def __init__(self, config):
+        self.config = config
+
+    @abc.abstractmethod
+    def get_configured_event_type(self):
+        """Returns supported event type."""
+
+    @abc.abstractmethod
+    def is_runnable(self, value):
+        """Returns True if trigger is active on specified event value."""
diff --git a/tests/unit/common/test_utils.py b/tests/unit/common/test_utils.py
index 9ad5474373..d91aca2b79 100644
--- a/tests/unit/common/test_utils.py
+++ b/tests/unit/common/test_utils.py
@@ -13,6 +13,7 @@
 #    under the License.
 
 from __future__ import print_function
+import collections
 import string
 import sys
 import threading
@@ -104,6 +105,8 @@ class TimerTestCase(test.TestCase):
                 mock_time.time = mock.MagicMock(return_value=end_time)
 
         self.assertIsNone(timer.error)
+        self.assertEqual(start_time, timer.timestamp())
+        self.assertEqual(end_time, timer.finish_timestamp())
         self.assertEqual(end_time - start_time, timer.duration())
 
     def test_timer_exception(self):
@@ -586,4 +589,78 @@ class FloatFormatterTestCase(test.TestCase):
     )
     @ddt.unpack
     def test_format_float_to_str(self, num_float, num_str):
-        self.assertEquals(num_str, utils.format_float_to_str(num_float))
\ No newline at end of file
+        self.assertEqual(num_str, utils.format_float_to_str(num_float))
+
+
+class DequeAsQueueTestCase(test.TestCase):
+
+    def setUp(self):
+        super(DequeAsQueueTestCase, self).setUp()
+        self.deque = collections.deque()
+        self.deque_as_queue = utils.DequeAsQueue(self.deque)
+
+    def test_qsize(self):
+        self.assertEqual(0, self.deque_as_queue.qsize())
+        self.deque.append(10)
+        self.assertEqual(1, self.deque_as_queue.qsize())
+
+    def test_put(self):
+        self.deque_as_queue.put(10)
+        self.assertEqual(10, self.deque.popleft())
+
+    def test_get(self):
+        self.deque.append(33)
+        self.assertEqual(33, self.deque_as_queue.get())
+
+    def test_empty(self):
+        self.assertFalse(self.deque_as_queue.empty())
+        self.deque.append(10)
+        self.assertTrue(self.deque_as_queue.empty())
+
+
+class StopwatchTestCase(test.TestCase):
+
+    @mock.patch("rally.common.utils.interruptable_sleep")
+    @mock.patch("rally.common.utils.time")
+    def test_stopwatch(self, mock_time, mock_interruptable_sleep):
+        mock_time.time.side_effect = [0, 0, 1, 2, 3]
+
+        sw = utils.Stopwatch()
+        sw.start()
+        sw.sleep(1)
+        sw.sleep(2)
+        sw.sleep(3)
+
+        mock_interruptable_sleep.assert_has_calls([
+            mock.call(1),
+            mock.call(1),
+            mock.call(1),
+        ])
+
+    @mock.patch("rally.common.utils.interruptable_sleep")
+    @mock.patch("rally.common.utils.time")
+    def test_no_sleep(self, mock_time, mock_interruptable_sleep):
+        mock_time.time.side_effect = [0, 1]
+
+        sw = utils.Stopwatch()
+        sw.start()
+        sw.sleep(1)
+
+        self.assertFalse(mock_interruptable_sleep.called)
+
+    @mock.patch("rally.common.utils.time")
+    def test_stopwatch_with_event(self, mock_time):
+        mock_time.time.side_effect = [0, 0, 1, 2, 3]
+        event = mock.Mock(spec=threading.Event)()
+
+        sw = utils.Stopwatch(stop_event=event)
+        sw.start()
+        sw.sleep(1)
+        sw.sleep(2)
+        sw.sleep(3)
+
+        event.wait.assert_has_calls([
+            mock.call(1),
+            mock.call(1),
+            mock.call(1),
+        ])
diff --git a/tests/unit/plugins/common/trigger/__init__.py b/tests/unit/plugins/common/trigger/__init__.py
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/tests/unit/plugins/common/trigger/test_event.py b/tests/unit/plugins/common/trigger/test_event.py
new file mode 100644
index 0000000000..b8447b5cb3
--- /dev/null
+++ b/tests/unit/plugins/common/trigger/test_event.py
@@ -0,0 +1,69 @@
+# Copyright 2016: Mirantis 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.
+
+import ddt
+import jsonschema
+
+from rally.task import trigger
+from tests.unit import test
+
+
+def create_config(**kwargs):
+    return {"name": "event", "args": kwargs}
+
+
+@ddt.ddt
+class EventTriggerTestCase(test.TestCase):
+
+    def setUp(self):
+        super(EventTriggerTestCase, self).setUp()
+        self.trigger = trigger.Trigger.get("event")({"unit": "iteration",
+                                                     "at": [1, 4, 5]})
+
+    @ddt.data((create_config(unit="time", at=[0, 3, 5]), True),
+              (create_config(unit="time", at=[2, 2]), False),
+              (create_config(unit="time", at=[-1]), False),
+              (create_config(unit="time", at=[1.5]), False),
+              (create_config(unit="time", at=[]), False),
+              (create_config(unit="time", wrong_prop=None), False),
+              (create_config(unit="time"), False),
+              (create_config(unit="iteration", at=[1, 5, 13]), True),
+              (create_config(unit="iteration", at=[1, 1]), False),
+              (create_config(unit="iteration", at=[0]), False),
+              (create_config(unit="iteration", at=[-1]), False),
+              (create_config(unit="iteration", at=[1.5]), False),
+              (create_config(unit="iteration", at=[]), False),
+              (create_config(unit="iteration", wrong_prop=None), False),
+              (create_config(unit="iteration"), False),
+              (create_config(unit="wrong-unit", at=[1, 2, 3]), False),
+              (create_config(at=[1, 2, 3]), False))
+    @ddt.unpack
+    def test_config_schema(self, config, valid):
+        if valid:
+            trigger.Trigger.validate(config)
+        else:
+            self.assertRaises(jsonschema.ValidationError,
+                              trigger.Trigger.validate, config)
+
+    def test_get_configured_event_type(self):
+        event_type = self.trigger.get_configured_event_type()
+        self.assertEqual("iteration", event_type)
+
+    @ddt.data((1, True), (4, True), (5, True),
+              (0, False), (2, False), (3, False), (6, False), (7, False))
+    @ddt.unpack
+    def test_is_runnable(self, value, expected_result):
+        result = self.trigger.is_runnable(value)
+        self.assertIs(result, expected_result)
diff --git a/tests/unit/task/test_trigger.py b/tests/unit/task/test_trigger.py
new file mode 100644
index 0000000000..637ad2b543
--- /dev/null
+++ b/tests/unit/task/test_trigger.py
@@ -0,0 +1,61 @@
+# Copyright 2016: Mirantis 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.
+
+"""Tests for Trigger base class."""
+
+import ddt
+import jsonschema
+
+from rally.task import trigger
+from tests.unit import test
+
+
+@trigger.configure(name="dummy_trigger")
+class DummyTrigger(trigger.Trigger):
+    CONFIG_SCHEMA = {"type": "integer"}
+
+    def get_configured_event_type(self):
+        return "dummy"
+
+    def is_runnable(self, value):
+        return value == self.config
+
+
+@ddt.ddt
+class TriggerTestCase(test.TestCase):
+
+    def setUp(self):
+        super(TriggerTestCase, self).setUp()
+        self.trigger = DummyTrigger(10)
+
+    @ddt.data(({"name": "dummy_trigger", "args": 5}, True),
+              ({"name": "dummy_trigger", "args": "str"}, False))
+    @ddt.unpack
+    def test_validate(self, config, valid):
+        if valid:
+            trigger.Trigger.validate(config)
+        else:
+            self.assertRaises(jsonschema.ValidationError,
+                              trigger.Trigger.validate, config)
+
+    def test_get_configured_event_type(self):
+        event_type = self.trigger.get_configured_event_type()
+        self.assertEqual("dummy", event_type)
+
+    @ddt.data((10, True), (1, False))
+    @ddt.unpack
+    def test_is_runnable(self, value, expected_result):
+        result = self.trigger.is_runnable(value)
+        self.assertIs(result, expected_result)