Refactored control
git-svn-id: https://hyracks.googlecode.com/svn/trunk/hyracks@50 123451ca-8445-de46-9d55-352943316053
diff --git a/hyracks-control-common/.classpath b/hyracks-control-common/.classpath
new file mode 100644
index 0000000..88cebb7
--- /dev/null
+++ b/hyracks-control-common/.classpath
@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<classpath>
+ <classpathentry kind="src" path="src/main/java"/>
+ <classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.6"/>
+ <classpathentry kind="con" path="org.maven.ide.eclipse.MAVEN2_CLASSPATH_CONTAINER"/>
+ <classpathentry kind="output" path="target/classes"/>
+</classpath>
diff --git a/hyracks-control-common/.project b/hyracks-control-common/.project
new file mode 100644
index 0000000..f6c06b0
--- /dev/null
+++ b/hyracks-control-common/.project
@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+ <name>hyracks-control-common</name>
+ <comment></comment>
+ <projects>
+ </projects>
+ <buildSpec>
+ <buildCommand>
+ <name>org.eclipse.jdt.core.javabuilder</name>
+ <arguments>
+ </arguments>
+ </buildCommand>
+ <buildCommand>
+ <name>org.maven.ide.eclipse.maven2Builder</name>
+ <arguments>
+ </arguments>
+ </buildCommand>
+ </buildSpec>
+ <natures>
+ <nature>org.maven.ide.eclipse.maven2Nature</nature>
+ <nature>org.eclipse.jdt.core.javanature</nature>
+ </natures>
+</projectDescription>
diff --git a/hyracks-control-common/.settings/org.eclipse.jdt.core.prefs b/hyracks-control-common/.settings/org.eclipse.jdt.core.prefs
new file mode 100644
index 0000000..9387c03
--- /dev/null
+++ b/hyracks-control-common/.settings/org.eclipse.jdt.core.prefs
@@ -0,0 +1,6 @@
+#Fri Jul 30 07:32:49 PDT 2010
+eclipse.preferences.version=1
+org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.6
+org.eclipse.jdt.core.compiler.compliance=1.6
+org.eclipse.jdt.core.compiler.problem.forbiddenReference=warning
+org.eclipse.jdt.core.compiler.source=1.6
diff --git a/hyracks-control-common/.settings/org.maven.ide.eclipse.prefs b/hyracks-control-common/.settings/org.maven.ide.eclipse.prefs
new file mode 100644
index 0000000..7e87666
--- /dev/null
+++ b/hyracks-control-common/.settings/org.maven.ide.eclipse.prefs
@@ -0,0 +1,9 @@
+#Fri Jul 30 07:32:48 PDT 2010
+activeProfiles=
+eclipse.preferences.version=1
+fullBuildGoals=process-test-resources
+includeModules=false
+resolveWorkspaceProjects=true
+resourceFilterGoals=process-resources resources\:testResources
+skipCompilerPlugin=true
+version=1
diff --git a/hyracks-control-common/pom.xml b/hyracks-control-common/pom.xml
new file mode 100644
index 0000000..e744b36
--- /dev/null
+++ b/hyracks-control-common/pom.xml
@@ -0,0 +1,28 @@
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
+ <modelVersion>4.0.0</modelVersion>
+ <groupId>edu.uci.ics.hyracks</groupId>
+ <artifactId>hyracks-control-common</artifactId>
+ <version>0.1.0</version>
+ <build>
+ <plugins>
+ <plugin>
+ <groupId>org.apache.maven.plugins</groupId>
+ <artifactId>maven-compiler-plugin</artifactId>
+ <version>2.0.2</version>
+ <configuration>
+ <source>1.6</source>
+ <target>1.6</target>
+ </configuration>
+ </plugin>
+ </plugins>
+ </build>
+ <dependencies>
+ <dependency>
+ <groupId>edu.uci.ics.hyracks</groupId>
+ <artifactId>hyracks-api</artifactId>
+ <version>0.1.0</version>
+ <type>jar</type>
+ <scope>compile</scope>
+ </dependency>
+ </dependencies>
+</project>
diff --git a/hyracks-control-common/src/main/java/edu/uci/ics/hyracks/control/common/AbstractRemoteService.java b/hyracks-control-common/src/main/java/edu/uci/ics/hyracks/control/common/AbstractRemoteService.java
new file mode 100644
index 0000000..cf64554
--- /dev/null
+++ b/hyracks-control-common/src/main/java/edu/uci/ics/hyracks/control/common/AbstractRemoteService.java
@@ -0,0 +1,27 @@
+/*
+ * Copyright 2009-2010 by The Regents of the University of California
+ * 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 from
+ *
+ * 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 edu.uci.ics.hyracks.control.common;
+
+import java.rmi.RemoteException;
+import java.rmi.server.UnicastRemoteObject;
+
+import edu.uci.ics.hyracks.control.common.service.IService;
+
+public abstract class AbstractRemoteService extends UnicastRemoteObject implements IService {
+ private static final long serialVersionUID = 1L;
+
+ public AbstractRemoteService() throws RemoteException {
+ }
+}
diff --git a/hyracks-control-common/src/main/java/edu/uci/ics/hyracks/control/common/NodeCapability.java b/hyracks-control-common/src/main/java/edu/uci/ics/hyracks/control/common/NodeCapability.java
new file mode 100644
index 0000000..d78bd74
--- /dev/null
+++ b/hyracks-control-common/src/main/java/edu/uci/ics/hyracks/control/common/NodeCapability.java
@@ -0,0 +1,31 @@
+/*
+ * Copyright 2009-2010 by The Regents of the University of California
+ * 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 from
+ *
+ * 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 edu.uci.ics.hyracks.control.common;
+
+import java.io.Serializable;
+
+public class NodeCapability implements Serializable {
+ private static final long serialVersionUID = 1L;
+
+ private int cpuCount;
+
+ public int getCPUCount() {
+ return cpuCount;
+ }
+
+ public void setCPUCount(int cpuCount) {
+ this.cpuCount = cpuCount;
+ }
+}
\ No newline at end of file
diff --git a/hyracks-control-common/src/main/java/edu/uci/ics/hyracks/control/common/NodeParameters.java b/hyracks-control-common/src/main/java/edu/uci/ics/hyracks/control/common/NodeParameters.java
new file mode 100644
index 0000000..7e6f3e9
--- /dev/null
+++ b/hyracks-control-common/src/main/java/edu/uci/ics/hyracks/control/common/NodeParameters.java
@@ -0,0 +1,31 @@
+/*
+ * Copyright 2009-2010 by The Regents of the University of California
+ * 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 from
+ *
+ * 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 edu.uci.ics.hyracks.control.common;
+
+import java.io.Serializable;
+
+public class NodeParameters implements Serializable {
+ private static final long serialVersionUID = 1L;
+
+ private int heartbeatPeriod;
+
+ public int getHeartbeatPeriod() {
+ return heartbeatPeriod;
+ }
+
+ public void setHeartbeatPeriod(int heartbeatPeriod) {
+ this.heartbeatPeriod = heartbeatPeriod;
+ }
+}
\ No newline at end of file
diff --git a/hyracks-control-common/src/main/java/edu/uci/ics/hyracks/control/common/comm/Endpoint.java b/hyracks-control-common/src/main/java/edu/uci/ics/hyracks/control/common/comm/Endpoint.java
new file mode 100644
index 0000000..d879d99
--- /dev/null
+++ b/hyracks-control-common/src/main/java/edu/uci/ics/hyracks/control/common/comm/Endpoint.java
@@ -0,0 +1,65 @@
+/*
+ * Copyright 2009-2010 by The Regents of the University of California
+ * 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 from
+ *
+ * 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 edu.uci.ics.hyracks.control.common.comm;
+
+import java.io.Serializable;
+import java.util.UUID;
+
+public final class Endpoint implements Serializable {
+ private static final long serialVersionUID = 1L;
+
+ private final UUID id;
+
+ private final NetworkAddress address;
+
+ private final int receiverIndex;
+
+ public Endpoint(NetworkAddress address, int receiverIndex) throws Exception {
+ id = UUID.randomUUID();
+ this.address = address;
+ this.receiverIndex = receiverIndex;
+ }
+
+ public UUID getEndpointId() {
+ return id;
+ }
+
+ public NetworkAddress getNetworkAddress() {
+ return address;
+ }
+
+ public int getReceiverIndex() {
+ return receiverIndex;
+ }
+
+ @Override
+ public int hashCode() {
+ return id.hashCode() + address.hashCode();
+ }
+
+ @Override
+ public boolean equals(Object o) {
+ if (!(o instanceof Endpoint)) {
+ return false;
+ }
+ Endpoint oe = (Endpoint) o;
+ return oe.id.equals(id) && oe.address.equals(address);
+ }
+
+ @Override
+ public String toString() {
+ return "[" + address + ":" + id + "]";
+ }
+}
\ No newline at end of file
diff --git a/hyracks-control-common/src/main/java/edu/uci/ics/hyracks/control/common/comm/NetworkAddress.java b/hyracks-control-common/src/main/java/edu/uci/ics/hyracks/control/common/comm/NetworkAddress.java
new file mode 100644
index 0000000..0b7ed04
--- /dev/null
+++ b/hyracks-control-common/src/main/java/edu/uci/ics/hyracks/control/common/comm/NetworkAddress.java
@@ -0,0 +1,58 @@
+/*
+ * Copyright 2009-2010 by The Regents of the University of California
+ * 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 from
+ *
+ * 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 edu.uci.ics.hyracks.control.common.comm;
+
+import java.io.Serializable;
+import java.net.InetAddress;
+
+public final class NetworkAddress implements Serializable {
+ private static final long serialVersionUID = 1L;
+
+ private final InetAddress ipAddress;
+
+ private final int port;
+
+ public NetworkAddress(InetAddress ipAddress, int port) {
+ this.ipAddress = ipAddress;
+ this.port = port;
+ }
+
+ public InetAddress getIpAddress() {
+ return ipAddress;
+ }
+
+ public int getPort() {
+ return port;
+ }
+
+ @Override
+ public String toString() {
+ return ipAddress + ":" + port;
+ }
+
+ @Override
+ public int hashCode() {
+ return ipAddress.hashCode() + port;
+ }
+
+ @Override
+ public boolean equals(Object o) {
+ if (!(o instanceof NetworkAddress)) {
+ return false;
+ }
+ NetworkAddress on = (NetworkAddress) o;
+ return on.port == port && on.ipAddress.equals(ipAddress);
+ }
+}
\ No newline at end of file
diff --git a/hyracks-control-common/src/main/java/edu/uci/ics/hyracks/control/common/job/JobPlan.java b/hyracks-control-common/src/main/java/edu/uci/ics/hyracks/control/common/job/JobPlan.java
new file mode 100644
index 0000000..016a6d4
--- /dev/null
+++ b/hyracks-control-common/src/main/java/edu/uci/ics/hyracks/control/common/job/JobPlan.java
@@ -0,0 +1,166 @@
+/*
+ * Copyright 2009-2010 by The Regents of the University of California
+ * 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 from
+ *
+ * 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 edu.uci.ics.hyracks.control.common.job;
+
+import java.io.Serializable;
+import java.util.ArrayList;
+import java.util.EnumSet;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+
+import edu.uci.ics.hyracks.api.dataflow.ActivityNodeId;
+import edu.uci.ics.hyracks.api.dataflow.IActivityNode;
+import edu.uci.ics.hyracks.api.dataflow.IConnectorDescriptor;
+import edu.uci.ics.hyracks.api.dataflow.OperatorDescriptorId;
+import edu.uci.ics.hyracks.api.dataflow.value.RecordDescriptor;
+import edu.uci.ics.hyracks.api.job.JobFlag;
+import edu.uci.ics.hyracks.api.job.JobSpecification;
+
+public class JobPlan implements Serializable {
+ private static final long serialVersionUID = 1L;
+
+ private final JobSpecification jobSpec;
+
+ private final EnumSet<JobFlag> jobFlags;
+
+ private final Map<ActivityNodeId, IActivityNode> activityNodes;
+
+ private final Map<ActivityNodeId, Set<ActivityNodeId>> blocker2blockedMap;
+
+ private final Map<ActivityNodeId, Set<ActivityNodeId>> blocked2blockerMap;
+
+ private final Map<OperatorDescriptorId, Set<ActivityNodeId>> operatorTaskMap;
+
+ private final Map<ActivityNodeId, List<Integer>> taskInputMap;
+
+ private final Map<ActivityNodeId, List<Integer>> taskOutputMap;
+
+ private final Map<OperatorDescriptorId, List<ActivityNodeId>> operatorInputMap;
+
+ private final Map<OperatorDescriptorId, List<ActivityNodeId>> operatorOutputMap;
+
+ private JobStage endStage;
+
+ public JobPlan(JobSpecification jobSpec, EnumSet<JobFlag> jobFlags) {
+ this.jobSpec = jobSpec;
+ this.jobFlags = jobFlags;
+ activityNodes = new HashMap<ActivityNodeId, IActivityNode>();
+ blocker2blockedMap = new HashMap<ActivityNodeId, Set<ActivityNodeId>>();
+ blocked2blockerMap = new HashMap<ActivityNodeId, Set<ActivityNodeId>>();
+ operatorTaskMap = new HashMap<OperatorDescriptorId, Set<ActivityNodeId>>();
+ taskInputMap = new HashMap<ActivityNodeId, List<Integer>>();
+ taskOutputMap = new HashMap<ActivityNodeId, List<Integer>>();
+ operatorInputMap = new HashMap<OperatorDescriptorId, List<ActivityNodeId>>();
+ operatorOutputMap = new HashMap<OperatorDescriptorId, List<ActivityNodeId>>();
+ }
+
+ public JobSpecification getJobSpecification() {
+ return jobSpec;
+ }
+
+ public EnumSet<JobFlag> getJobFlags() {
+ return jobFlags;
+ }
+
+ public Map<ActivityNodeId, IActivityNode> getActivityNodeMap() {
+ return activityNodes;
+ }
+
+ public Map<ActivityNodeId, Set<ActivityNodeId>> getBlocker2BlockedMap() {
+ return blocker2blockedMap;
+ }
+
+ public Map<ActivityNodeId, Set<ActivityNodeId>> getBlocked2BlockerMap() {
+ return blocked2blockerMap;
+ }
+
+ public Map<OperatorDescriptorId, Set<ActivityNodeId>> getOperatorTaskMap() {
+ return operatorTaskMap;
+ }
+
+ public Map<ActivityNodeId, List<Integer>> getTaskInputMap() {
+ return taskInputMap;
+ }
+
+ public Map<ActivityNodeId, List<Integer>> getTaskOutputMap() {
+ return taskOutputMap;
+ }
+
+ public Map<OperatorDescriptorId, List<ActivityNodeId>> getOperatorInputMap() {
+ return operatorInputMap;
+ }
+
+ public Map<OperatorDescriptorId, List<ActivityNodeId>> getOperatorOutputMap() {
+ return operatorOutputMap;
+ }
+
+ public void setEndStage(JobStage endStage) {
+ this.endStage = endStage;
+ }
+
+ public JobStage getEndStage() {
+ return endStage;
+ }
+
+ public List<IConnectorDescriptor> getTaskInputs(ActivityNodeId hanId) {
+ List<Integer> inputIndexes = taskInputMap.get(hanId);
+ if (inputIndexes == null) {
+ return null;
+ }
+ OperatorDescriptorId ownerId = hanId.getOperatorDescriptorId();
+ List<IConnectorDescriptor> inputs = new ArrayList<IConnectorDescriptor>();
+ for (Integer i : inputIndexes) {
+ inputs.add(jobSpec.getInputConnectorDescriptor(ownerId, i));
+ }
+ return inputs;
+ }
+
+ public List<IConnectorDescriptor> getTaskOutputs(ActivityNodeId hanId) {
+ List<Integer> outputIndexes = taskOutputMap.get(hanId);
+ if (outputIndexes == null) {
+ return null;
+ }
+ OperatorDescriptorId ownerId = hanId.getOperatorDescriptorId();
+ List<IConnectorDescriptor> outputs = new ArrayList<IConnectorDescriptor>();
+ for (Integer i : outputIndexes) {
+ outputs.add(jobSpec.getOutputConnectorDescriptor(ownerId, i));
+ }
+ return outputs;
+ }
+
+ public RecordDescriptor getTaskInputRecordDescriptor(ActivityNodeId hanId, int inputIndex) {
+ int opInputIndex = getTaskInputMap().get(hanId).get(inputIndex);
+ return jobSpec.getOperatorInputRecordDescriptor(hanId.getOperatorDescriptorId(), opInputIndex);
+ }
+
+ public RecordDescriptor getTaskOutputRecordDescriptor(ActivityNodeId hanId, int outputIndex) {
+ int opOutputIndex = getTaskOutputMap().get(hanId).get(outputIndex);
+ return jobSpec.getOperatorOutputRecordDescriptor(hanId.getOperatorDescriptorId(), opOutputIndex);
+ }
+
+ @Override
+ public String toString() {
+ StringBuilder buffer = new StringBuilder();
+ buffer.append("ActivityNodes: " + activityNodes);
+ buffer.append('\n');
+ buffer.append("Blocker->Blocked: " + blocker2blockedMap);
+ buffer.append('\n');
+ buffer.append("Blocked->Blocker: " + blocked2blockerMap);
+ buffer.append('\n');
+ return buffer.toString();
+ }
+}
\ No newline at end of file
diff --git a/hyracks-control-common/src/main/java/edu/uci/ics/hyracks/control/common/job/JobStage.java b/hyracks-control-common/src/main/java/edu/uci/ics/hyracks/control/common/job/JobStage.java
new file mode 100644
index 0000000..2514866
--- /dev/null
+++ b/hyracks-control-common/src/main/java/edu/uci/ics/hyracks/control/common/job/JobStage.java
@@ -0,0 +1,89 @@
+/*
+ * Copyright 2009-2010 by The Regents of the University of California
+ * 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 from
+ *
+ * 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 edu.uci.ics.hyracks.control.common.job;
+
+import java.io.Serializable;
+import java.util.HashSet;
+import java.util.Set;
+import java.util.UUID;
+
+import edu.uci.ics.hyracks.api.dataflow.ActivityNodeId;
+
+public class JobStage implements Serializable {
+ private static final long serialVersionUID = 1L;
+
+ private final UUID id;
+
+ private final Set<ActivityNodeId> tasks;
+
+ private final Set<JobStage> dependencies;
+
+ private final Set<JobStage> dependents;
+
+ private boolean started;
+
+ public JobStage(Set<ActivityNodeId> tasks) {
+ this.id = UUID.randomUUID();
+ this.tasks = tasks;
+ dependencies = new HashSet<JobStage>();
+ dependents = new HashSet<JobStage>();
+ }
+
+ public UUID getId() {
+ return id;
+ }
+
+ public Set<ActivityNodeId> getTasks() {
+ return tasks;
+ }
+
+ public void addDependency(JobStage stage) {
+ dependencies.add(stage);
+ }
+
+ public void addDependent(JobStage stage) {
+ dependents.add(stage);
+ }
+
+ public Set<JobStage> getDependencies() {
+ return dependencies;
+ }
+
+ @Override
+ public int hashCode() {
+ return id == null ? 0 : id.hashCode();
+ }
+
+ @Override
+ public boolean equals(Object o) {
+ if (!(o instanceof JobStage)) {
+ return false;
+ }
+ return id == ((JobStage) o).id;
+ }
+
+ @Override
+ public String toString() {
+ return "SID:" + id + ": " + tasks;
+ }
+
+ public boolean isStarted() {
+ return started;
+ }
+
+ public void setStarted() {
+ started = true;
+ }
+}
\ No newline at end of file
diff --git a/hyracks-control-common/src/main/java/edu/uci/ics/hyracks/control/common/service/AbstractService.java b/hyracks-control-common/src/main/java/edu/uci/ics/hyracks/control/common/service/AbstractService.java
new file mode 100644
index 0000000..4f9cb92
--- /dev/null
+++ b/hyracks-control-common/src/main/java/edu/uci/ics/hyracks/control/common/service/AbstractService.java
@@ -0,0 +1,18 @@
+/*
+ * Copyright 2009-2010 by The Regents of the University of California
+ * 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 from
+ *
+ * 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 edu.uci.ics.hyracks.control.common.service;
+
+public abstract class AbstractService implements IService {
+}
\ No newline at end of file
diff --git a/hyracks-control-common/src/main/java/edu/uci/ics/hyracks/control/common/service/ILifeCycle.java b/hyracks-control-common/src/main/java/edu/uci/ics/hyracks/control/common/service/ILifeCycle.java
new file mode 100644
index 0000000..c9f5abb
--- /dev/null
+++ b/hyracks-control-common/src/main/java/edu/uci/ics/hyracks/control/common/service/ILifeCycle.java
@@ -0,0 +1,21 @@
+/*
+ * Copyright 2009-2010 by The Regents of the University of California
+ * 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 from
+ *
+ * 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 edu.uci.ics.hyracks.control.common.service;
+
+public interface ILifeCycle {
+ public void start() throws Exception;
+
+ public void stop() throws Exception;
+}
\ No newline at end of file
diff --git a/hyracks-control-common/src/main/java/edu/uci/ics/hyracks/control/common/service/IService.java b/hyracks-control-common/src/main/java/edu/uci/ics/hyracks/control/common/service/IService.java
new file mode 100644
index 0000000..6bde315
--- /dev/null
+++ b/hyracks-control-common/src/main/java/edu/uci/ics/hyracks/control/common/service/IService.java
@@ -0,0 +1,19 @@
+/*
+ * Copyright 2009-2010 by The Regents of the University of California
+ * 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 from
+ *
+ * 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 edu.uci.ics.hyracks.control.common.service;
+
+
+public interface IService extends ILifeCycle {
+}
\ No newline at end of file